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U

N L SSIFIED

R E

S f l H C T E D

D E P A R T M E N T 

O THE R

MY 

T E C H N I C A L 

M A N U

A L

8-INCH

HOW

ITZER

 M 2

CARRI

AGE M l

,

MOUNT

M 17

AND

H E

A V Y  C

ARRIAG

E

L

IM BE R

M 5

R E G R A D E O UN

CL SSIFIED

B Y

'O F B O D

D I R

5200.1

R

BY.

R E S IM T O D

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W A R DEP

ARTMENT

Wa

shington 25,

D.C.,

1

 M a

y 1947

TM

 

9-335

, 8-in

ch Howitzer M 2 ; Carriage M

l;

Mount M 1 7

;

and Heavy Carri

age

Limber M5, is pub

lished

for

the informati

on

and guidance

of

all

concerned.

The

materia

l

in

this

man

ual is

correct

 as

o

f 30

January

 

1947 .

[AG

 3 0 0 .7 27 Sep

t

44)

]

BY

 ORDER O F THE SECRE

TA RY

O F

WA

R:

OFFICIAL:

DWIG H T D. EISENH

OWER

E D W A R

D

F. W

ITSELL

D I S T R I B U T I O N

AAP

5); 

AGF  (2)

;  

T

10);

Dept

(5)

;

Arm

Sv  Bd

1);

Tech Sv

2); FC 1);

PE (Ord 0 )

(5)

;

Establishments

9

 

3); Dist

9

3

);  Gen Sp Sv

 Sc

h (5)

;

A (Z

I)

10),

(Overs

eas) 3);

C H Q 2); D 2). O n

e (1) copy

to each

of

the fol

lowing T/0 E's: 6-359

; 6-365; 6-367

;

9-7;

 9-9;

9-6

5;

9-67;

9-76;

 

9-315;

9-318.

For exp

lanation of

dis

tribution

formula,

 

see

FM  21-6.

ii

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CONT

ENTS

PART

ONE

INTRODUC

TION

r gr phs

 

ge

Gener

al 

1-2

1

//.

Description

and

data

3-6

3

PART

 

TWO 

OPERA

TING INST

RUCTIONS

 

Gene

ral

7

16

S

ervice

upon

receip

t of

e

quipment

 

8 10

16

y.

Con

trols

and

  instr

uments

  1 1 1

7 1

7

Opera

tion

under usua

l condit

ions.

1 8 23

27

Opera

tion

under

unusual

c

onditions

24 27  

40

Demolit

ion

to

pr

event

e

nem y us

e;. 28 29

 

43

PART THRE

E MA

INTENANCE

  INSTRUC

TIONS

Gener

al

3 0 3 1

 

46

Org

anization

al spare

 

parts

tools

and eq

uipment

3 2  3 3

46

Lubric

ation

3 4

  3 6 

6 4

Preve

ntive

main

tenance se

rvice... 3

7 40

74

Malfuncti

ons a

nd correc

tions.....

 

4

1 54

87

Tub

e and

bree

ch ring

55  56

92

Breech mechanism

57   60

94

Firin

g mechan

ism

Ml  a

nd

per

cus

sion

  mechanism

 

6 1 6 6  

109

Co

unterbalan

ce assembly

6 7 7 0 

11

6

Recoil mech

anism an

d cr

adle

7 1 7

2

1 1 7

Eq

uilibrator

s

7 3   7 4

126

Ele

vating m

echanism

 

7 5 7 6

 

13 0

Traversi

ng

mechan

ism

7 7

7 8

13 1

Bo

gie

79

13 3

Whee

ls

a

nd

tires

80 85

 

1 3

4

Brakes

86 87

140

Heavy

  carri

age  limb

er M5

88

89

146

PART FO

UR  AUX

ILIARY EQUI

PMENT

General

9

0

147

Am

munition

91 100 

1

47

Sigh

ting an

d

f

ire contro

l

 equi

pment

101 1

09

1 6

8

Subca

liber equ

ipment

1 1 0 1 1 8

 

189

A

PPENDIX I

STORAG

E

AN

D S

HIPMENT

209

I

I RE

FERE

NCES

 

224

IN

DEX

 

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P

  RT ONE

INTRO

DUCTIO

N

Sec

tion

I

GENE

RAL

1 Scope

Thi

s

ma

nual

is

  pub

lished for

the informati

on  of

  the

using

arms

 

and

services.

It

conta

ins technica

l

informa

tion

required for

the

 identificat

ion, use,

 and

c

are of the

 8-inch how

itzer

M2,

carr

iage

Ml, 

heavy 

carriage

limber

M5,

and-mount

M17,

and

of

ammuni

t

ion and

a

ccessory

equipm

ent.

In all cases

where

 the

n

ature

of the repair, mo

dification,

 or

ad

justment is be

yond the

scope or

facilities o

f the un

it, inform the

resp

onsible ordnan

ce service

so

that

trai

ned 

perso

nnel

with

suit

 

ab

le to

ols and

 equip

ment

may

be  prov

ided, 

or prop

er 

in

structions

 

issued

.

2

Records

A R T I L L E R

Y

G U N

B O O

K .

1) Th

e

Artil

lery G

un B

ook

0.0.

 

Fo

rm

5825)

  is u

sed to keep

an accurat

e

record of the m

ateriel. It

m

ust

a

lways 

remain with

 the mat

eriel

r

egardless

of

where

it

may

be

sent.

T

he book

is  divided

  a

s

fo

llows: 

reco

rd

of  a

ssignment

,

batt

ery c

ommander

's

daily

gun

record;

and  inspect

or's rec

ord

of

examin

ation.

It

must conta

in the

 date of issua

nce of t

he mate

riel,

by w

hom 

used,

and

the

 place 

where issued

 

2)

This

bo

ok s

hould be in

 the

p

ossession

of

the org

anization

a

t

a

ll ti

mes, and its compl

eteness

of record

s

and 

.its

whereab

outs

are

the respo

nsibility of

the battery

 

com

mander.

If a new

ho

witzer

is

ins

talled on the carriage

, a

ll

data

re

corded in the

old book with

referenc

e

to

sigh

ts, mounts, etc.,

must be

 

copied 

into the new

bo

ok

before the old

 

bo

ok

is

re

linquished

.

Record

  of assignment

data mus

t be remov

ed and des

troyed prior to

entering

 combat.

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 3) W hen a gun book

for

a

weapon has been

 

lost and

every

effort to obtain

 

the original

gun book has

been

to

no

av

ail, the

suppo

rting ordnance maintenanc

e unit will prepare a

new gun

boo

k

lis

ting

su

ch information

as

they

may be able to obtain from

any

source

and

estimate the

number

of

rounds 

fired

from

the

weapo

n.

The

 

number

of

rounds

entered in the

new gun book

should

be clear

ly

indica

ted as an

e

stimated number

of

rounds

fired.

Inquir

ies concerning lost gun books

should also be forw

arded

to

the Office,

Chief of Ordnance,

Field

Service,

Maintenance Div

ision,

Artillery

Branc

h, Washington

25, D. C.

 4)

When

an Artillery

Gun

Book has

become

separat

ed from

 

the weapon

to

which

it pertains and

efforts

to 

locate the weapon

have

failed, 

forward

the gun

book

immediately

to

the

Office,

Chief

of Ordnance, Field Service,

  Maintenance Division,

Artillery 

Branch,

  Washington 25,

D.

C.

 5) Complete

instru

ctions on how to make

entries

in

the

Artil

lery

Gun Book  are contained therein.

It is  absolutely

 

essential

that

the gun

book entries be

kep

t

complete and up

to d

ate.

In

order

to f

acilitate

pro

per

ma

intenance

of

the

howitzer and its rel

ated

materiel

that

is,

carriage,

recoil mechanism,

and

associated

fire

control equipment)

and to avoid

unn

ecessary duplication

of repairs

and maintenance

, make the following

additional entries in the

gun

book:

 a)

This

record should

show

the date on which the

modification was

com

pleted

 and bear

t

he signatu

re of

the

officer or mechan

ic

r

esponsible

for

the

completion.

 6)

This record should

be suffici

ently 

detailed to

prevent duplication

and afford

proper id

entification by the inspector.

6.

FIELD 

REPORT O F

ACCIDENTS.

W h

en an accident

involving

am

munition occurs

during practice, the incident

will be

re

ported

as

prescribed in

A R

750

-10

by the or

dnance  officer under

whose

supervision the ammuniti

on is maintained

 or issued.

UNSATI

SFACTORY E Q U I P M

ENT REPORT.  Suggestions

for im

provement

in design, maintenance, s

afety, and efficiency of opera

tion,

prom

pted by

chronic failure or

malfun

ction

of

the

weapon,

spa

re

parts, or equipment, should be reported on WD

A GO   Form

46

8 Unsatisfactory Equipmen

t

Report)

with all pertin

ent in

formation n

ecessary to init

iate

c

orrective

acti

on. Forwa

rd

the

report to the Office, Chief

  of Ordnance, Field Service,

Mainte

nance

Division,

through

technical channels

in accordance 

with

in -

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st

ruction No. 7

on the 

fo

rm. I

f

W

D AGO

Form 468 is n

ot avail

able, refer 

to TM 37

-250  for list of

data required

on Uns

atis

factory

Equipment

Report.

REPORTS O N NEOPBENE 

G A S CHE

CK PADS.

Submit

period

ic

reports

on

the

operation,

maintenance,

serviceability,

and m al

functioning of the

Neopr

ene

gas che

ck pads t

hrough

technic

al

chan

nels to

 

Off

ice, Chief of

Ordnance, A

ttention: O R D F M

.

Section II.

D E S C R I P T

I O N AND  D A T A

3. General

The

8-inch howitze

r M 2

on

carriag

e Ml

is a heavy fiel

d

weapon,

utilizing 

the

two-wheel,

single-axle

limber

M 5

and

an

eight-wheel, t

wo-axle bogie for

support

ing

the

  weight

while

traveling

 

(fi

g. 1).

 

The carr

iage

is

low

ered to the groun

d and the

bogie may be

detached and

rolled aside. W

hen in travel

ing posi

tio

n, the tr

ail

ends o

f the carriage

are a

ttached to heavy carriage

l

im ber

M 5

(figs. 1   and 2), or

it

can

be

towed without

a limber

 

by

means of a

special

prime mover

with a

goo

se-neck

attach

ment.

W he

n emp

laced, removab

le spades are

installed on the carr

iage 

and

on

the

rear

ends 

of

the

trails

(fig.

3).

The recoil

mechanism

is

of the

hydropneu

matic

t

ype with

a variable reco

il

feature

to

effec

t differ

ent len

gths

of

recoil at

various

degrees

of

elevation.

Air brakes

 

are pro

vided for use

during transit; the hand

brakes

on the front bogie whee

ls are

applied when the wea

pon is parked

 

(fig. 1). Separate

-loading

ammunition is used

 and is han

d-rammed.

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E

Q

U

L

B

O

R

A

M

B

E

.

Q

M

O

U

M

E

E

N

H

W

H

B

M

E

S

M

 

F

R

S

B

O

E

L

F

N

 

S

W

 

W

R H

B

L

E

R

A

 

P

D

 

1

O

8

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I

s

O

 

3

W

 

a

o

E

Q

L

B

O

T

R

O

C

C

A

N

T

O

P

C

A

R

I

A

E

B

G

I

E

L

F

N

M

N

S

M

B

M

N

S

M

L

A

N

L

T

R

L

B

O

O

M

C

A

R

I

A

E

L

E

N

M

N

S

M

 

R

S

R

P

 

8/11/2019 TM9-335

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6. Th

e

8-inch

howitzer M

2 on mou

nt

M

17, mounted

on the

how

itzer motor

carriag

e

M

43 figs. 4 an

d

5), is

  a

 

self-p

ropelled

weapon em

ployed against empla

ced ar

tillery and 

other ground

 

object

ives.

T

he mou

nt

M

17 is lo cate

d in the fighting

 com

partment

of

the

howitzer  motor

carriage

M43,

and 

is

tilted 

5

degrees

for

ward to perm

it the

5-degre

e angle

of depres

sion. A stop

attached

to the elevat

ing arc limits

the

ele

vation .

Stops are also added

to

the

traversing

 

arc

 to limit th

e

tr

averse. The elevat

ing mechanism

 

clutch lever is

fitted with

 

a

  foot control

lever assem bl

y to release

the elevating mec

hanism brake. The

  panoram

ic

telescope

  moun

t

M 1

8A 1

and

the direct-fir

e telescope m

ount M 7 5 are

installed on 

the left tru

nnion.

Th

e elbo w te

lescope mount M71

and th

e

quadra

nt

mount

Ml

are

installed

on

the

right

trunnion.

In other respects

the to p

  carriage of the  mount

 

is

identical

with tha

t of the

fiel

d

carr

iage. The lower

part of the mount i

s a pedestal

in

pla

ce of 

the

bottom

carriage on the field

carriag

e.

4

Id

entification

Information

SERIA

L N U MBERS.

T

he serial

numbers lis

ted

below

  are 

re

quired

for

reco

rds on erning

the com pon

ents

of

t

his materiel.

H O W I T Z E R

SERIAL

N U M B E R .

This 

number

is

stamped

on

the 

bre

ech ring

 

fig. 6).

R E C O I L

 

M E C H A

N ISM

S E R I A L N U MB E R.

This numb

er appears

on

 a br

ass

pla

te

o

n the right

side of the

r

ecoil m

echanism 

fig.

7).

C A

R R I A G E O R M O U N T

)

SE R IAL N U M B E R .

 

This

number

ap

pears on a

bras

s

plate on

right side 

of top c

arriage, just below

trunnio

n bearing f

ig.

8)

.

E Q U I L I B R A T O R

SERIAL   N U M B E R .

This

number

appears

on

front

head

o

f equilibra

tor fig . 9).

/. L I M B E R   SERI

AL

N

U MB E R.

This number appears'o

n a nam

e

plate

attached to limber

lift b

racket 

fig.

10).

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8

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R 

P

D 1

77

 

K

 

PD

 

1

  7

981

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  2 0 0 0  

P

^

 

E

 

P

D 1

  79

82

H

A

 

PD

 1 

7 8

3

 

8/11/2019 TM9-335

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R

PD

 

79

84

 

L

IM

 

ER

 

N

 

M

 

P

L

T

 

R

 

PD

 

23

94

 

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5. D

ifferences

in

Models

There are no

differences among  models wh

ich

will af

fect troop

use

or

care

of

the materie

l. The

only

differen

ces

are betw

een the

recoil mechanism M 4

and M 4 A 1) and M23. T

he lugs on the 

cradle

front

yoke

of

the

recoil mechanism

M 4

have been removed

and cradle traveling locks have

been

provided

 

for

use

on the

howitzer motor

carriage

M43.

The

recoil

m

echanism

M 2 3

can

not

be

used on the heavy field

carriage. Conversely, the

recoil mech

an

ism

M 4

and M 4 A 1) cannot be u

sed

on the

motor carriage.

6.

Tabulated Data

D A T A

P E R T A IN

I N G T O

8-lNCH

H O W

I T Z E R

M 2.

1)

Weight o

f:

H owitzer comp

lete with  breech

mechanism)....

10,24

0 Ib

Breech mechanism ....

....................... 405

Ib

Tube assembly bar

rel).......................

9,835

Ib

Tipping parts ....................... ap

prox)

14,200 Ib

Length of:

Howitzer .......................

.............

209.6 in.

Tube m

uzzle

to rear

face of breech ring ........

202.5 in .

B o

re ........................

.......... 200n.) 25 ca

l.

R

ifling

..................

.................... 164.

8 in .

Type

of:

Breechblock ............

.............. nterrupted

 

screw

Firing

 

m

echanism...................

.Percussi

on

h

ammer

Am

munition. .For

com plete

ammunitio

n

data

,

see

section

XXVII

  2 )

M uzzle velocity

average velocity with

a new

ho

witzer)

Shell HE

maximum

zone

charge .....

.....

1,950

ft

per

sec

Range maximum)

HE Shell....................

................

18,510 yd

Rate of

fire:

Normal ......................

........ round

per 2

min

Maximum ..........................

... round per min

Maximum number

of

r

ounds which

m

ay be fired

consecutively

at maximum rate

 

bef

ore

cool

ing.................... 30

Maximum p

owder

pressure

permitted 33,000 Ib per

sq in.

Average

accuracy life.............

.............. ,6 0 0

rounds

12

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6 D T P E R T A I N I N G T

O

C A R

R I A G E M l A N D M O U N T M17.

(1)

Time

to emplace....

...................

1 2 to

6 hr

Weights:

Howitzer and

carriage

or

mount

(

fir

ing position)

29

,7 00

Ib

83,000 Ib

How

itzer and carriage, complete wi

th

accessories

traveling

position).... 32,000 Ib 83,000 Ib

Bogie

5,375

Ib

Dimensions

in travelin

g position

over-all) :

Length

.................. approx)

36

ft

24

ft

Wi

dth

987 /

8

in   124

in .

H

eight

1 08

in.

130

in .

Minimum roa

d clearance

1 2 /2

in- 1 9

  in-

Turning radius 37

ft

Towed by

:

With l

imber.................

18-ton,

high-speed

tractor

M 4

Without limber .Semitrailed

b y

7^-ton,

6x6 truck

Recoil mechanisms

M4, M4A1, and

M 23:

M aximum

allowable recoil..........

............... 0 in.

Ele

vation

at

which

m

aximum

recoil occurs:

Normal 

charge........

............ 

375

mils approx)

Supe

rcharge 

300 to   425 mils

Normal

recoil

at

375 mils app

rox) elevation

 

(normal

cha

rge)

51 in .

Reco

il

at

300 to 425  mils elev

ation

supercharge)

.... 6 7

in .

Type of reco

il mechanism Hydropneumatic

Type

of equilibrator

neumatic

Weight .......

........................ app

rox) 3,925 Ib

Tires:

Type

and siz

e

tires)

11x 20, standard

Type and

size

tubes)

1 x

20, standard

Air pressure

(bogie 

assembly

tires)

5

psi

Type

of

b

rakes Mechanical,

air

or

manually

operated

Wheel base of bogie

7

in .

Tre

ad:

Over-all

width:

Center-to-center of in side bogie

wheels 1 01   in.

Center-to-center

of

outside bogie

wheels 89 in .

910712 O50 2

  3

8/11/2019 TM9-335

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 2)

Limits of elevat

ion:

Maximum 65  

deg or

  1,156 mils 5 2

deg or

923 mils

Depress

ion M i

nus 2 deg

or minus Minus

5 deg o

r

35 .5  

mils

m

inus

88.7

mils

L

imits

of traverse

.. 3

0

deg

or

5

33  m

ils, 18 deg or 3

19.5 mils

right o r lef

t ri

ght; 16

deg

 

or

284 mils

left

Elevation per turn

 

of

h

andwheel

13.10 m ils

1

3.10 mils

Dia

meter of cir

cle

of

emplacement 37

f

t

Traverse

per

turn 

of

h

andwheel

10 mils 

10 mils

 3)

Recoil

 

oil:

Type 

SeeW D L O

  9-335

O il req

uired to

fill

r

ecoil

m

echanism.

...............

15

g al

Reserve

 

in

repleni

sher

pt

Res

erve in rec

uperator

pt

DATA  P E R T A

I N I N G

T

L I M B E R M 5

.

Wid

th

ov

er-all)

98 in .

Wid

th

of

 tr

ead, center-to-

center

of

wheels

8

3

in .

Heig

ht

o

f

lunette limbered po

sition ......

.......... .211/4 in .

Weig

ht

approx)

2,300 Ib

Tires:

Type

and size tires)

1 

x 20, standa

rd

Type

and

size

tubes)

1 

x

20,

standard

Pressu

re

5

I

b

LIST

O F

SIGH TING

E Q U I P

M E NT.

CHES

T, lighting

 

eq

uipment,  M

21

C O V E R ,

aim

ing post M 4 0 1 

LIGHT

aiming post M 14

with green 

filter)

LIGH

T, aim

ing

p

ost M1 4 wit

h re

d filter)

LIG

HT

i

nstrument, M 1

2 for

quadrant

mount

M

l and

general

lighting)

LIGHT,

instrument,

 

M 1

9 for panoramic

  telescope M 1 2 )

LIGHT, instrume

nt, M 3

3 for

teles

cope

mount M 7 5 )

LIGHT, instrume

nt, M 3

6 for telescope

mount M 71)

M O U N T ,

quadrant, M

l

M O U N T,

telescope, M 18

A 1

for

ca

rriage

Ml

on

ly)

M O U N T, telesco

pe, M 71

  for

mount M 1 7 only)

M O

U N T , telescope,

M 75   for

mount M 17

  only)

14

8/11/2019 TM9-335

19/240

PERISC

OPE, M 13 

or

M 6

(substitu

te)

P O S T ,

aiming, M

l

Q U A D RA

NT, gun

ner's, M

l (mils)

SIGHT,

bore,

breec

h

SIGHT, bor

e, muz

zle

TA R

GET, testing

TELESC

OPE, M 69G for

mount M 1 7

only)

TELE

SCOPE,

elbow,

M16A 1G (for mount M 1 7

only)

TELESCOP

E,

panor

amic, M 12

LIST O F

FIRE C O N T R O

L

EQUIP

M ENT.

B

IN O CULAR, M

13

BO

ARD,

plott

ing, M 5

BOARD,

plotting,

sound

ranging,

Ml,

complete

CIRCLE , a

iming, Ml,  complete

CO RRECT

OR, wind

,

soun

d rang

ing, Ml

I

NSTRUMENT,

  azimuth, M

l, complete

or

INSTRUM

ENT, spotting, M 2

SETTER, fuze, M 1 4

SETTER, 

fu

ze,

hand, M 23

TABLE, firing,

 

8-K

-l

T

ABLE, firing,

 

graphical,

M 8

(short range)

 

TABLE,

 

firin

g, grap

hical,

M 1 7

(long

range)

TABLE,

firing, graphical, M 33

 

T

ELESCOPE,  B.C

.,

M 6

5, complete

TELESCOPE, ob

servation, M13, comple

te

THER

MOMETER, pow

der temperature,

  Ml,

w/case

co

mplete

W A T C H

,

po

cket,

15

or

more

jewe

l, complete 

W A TC

H ,

stop, type

B,

class 15

W A T C H ,

wrist,

7 -jewel, complete

/. DAT

A

P E

RTAINING

T O

 

S U B C

A L I B E R

E

QUIPMENT

(GUN M1916

A N D

MOUNT M 1 0 ) . (1)

Weight

of

gun

and m

ount.......

.............. ........

8 Ib

Length

 of

bore

29 13

in .

C a

liber

......

..............

..............

.......... 7-mm

T

ype of breechbl

ock .

..............

.........Eccentric screw

Type 

of firin

g mechanism

 ...........

..............

.

Tr

igger

Type

of recoil

mechanism

.......

...............

 

Hydro

spring

M aximum allowable 

recoil

to 10

in .

Ammun

ition.. For complet

e ammuniti

on data, se

e

secti

on XXV

II

(

2 )

M aximum ra

te of

fire.......

............... 5 rounds

per min

Rang

e

.

...............

................

...........4 9

00yd

Muzzl

e

veloc

ity

1,27

6 ft p

er

s

ec

15

8/11/2019 TM9-335

20/240

PAR

T

TWO

OPERA

TING INST

RUCTIONS

Section III. GENERAL

7. Scope

Part

two

contains

information

fo

r

the

guidance

of

the pe

rsonnel

re

sponsible for the

operation of this equ

ipment.  It contains

information

on

the operation of

 

the

equipment with  thedescrip

 

tion and

location

of

the

controls

and

instruments.

Se

ction

IV

. SERVICE UPON RECEIPT

OF

EQUIPMENT

8. General

Upon the receipt

of new or used m

ateriel,

it is

the respon

sibility

 of

the

officer

in  

charge.to ascertain

whether it is

complete

and

in sound operating

condition.

A

record should be ma

de of

any

missing

parts

and

of

any

malfunctions, and any

such

condi

tions

should be corrected as quickly a

s

possible

.

6.

Attention

should be given

to small and minor parts,

as

these

are the

more likely

to

become lost and

may

se

riously affect the

proper

functioning

of

the

materiel.

The materiel should be

  prepared for service in

 

accordance

with instructions

given in

parag

raphs

9

  or

1 0.

9. New

Equipment

Disassemble

 

the

breech

mechani

sm  and

soak the parts (ex

cept the gas check pad)

in

dry cleaning solvent

w hile the bore a

nd

breech ring

are bei

ng cleaned .

C

lean

bore

with a wooden scraper

to remove

most

  of the corrosion

preventive before

using

dry

cleaning

solvent. After

 

t

he bulk o

f the

corrosi

on

p

reventive ha

s

been removed

 

from the bore, run

cloths so

aked

in

 

dry

cleaning

solv

ent throu

gh

the bore

until all the corrosion preventiv

e

has

been removed.

Clean

the

breech

mechanism

parts

thoroughly and

lubricate the tube and

breech mechanism.

All lubricating

fittings

should

be properly identified with red

circles approxi

mately inch in

diameter,

bu

t

the

fittings, oil

cups, and oilholes

them

selves

should not be painted over. B

earing

and

sliding surfaces,

hinged

joints, latches,

and

other

movable

parts should be clean a

nd

free f

rom rust and other

foreign matter,

and

properly

lubricated.

16

8/11/2019 TM9-335

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c . Lubricate the materiel in accordance with section X I.

Inspect for

broken

or missing parts.

Open and

close

breech.

/.

The

recoil

mechanism

filling

plug

should

be

painted green to

indicate

that

the

mechanism

is

filled

with

recoil

oil

(special).

Inspect all

operating parts

for

smoothness of

operation.

Check firing

mechanism

for

proper

functioning.

If

adjust

ment is necessary, refer

to section XVI.

Elevate and

traverse the weapon throughout

its

complete

range

to

determine

smoothness

of operation. Report binding,

backlash

in

excess of

f c

inch, or looseness of mountings

to ord

nance

maintenance

personnel. If

elevating

or traversing

mech

anism may

be

moved without

releasing elevating

clutch or

traversing

brake,

notify

ordnance maintenance personnel.

Examine the howitzer and mount for general

appearance. If

the

paint

has deteriorated or become

damaged,

leaving

exposed

portions

of

bare

metal, the materiel should

be repainted.

C h e c k operation

of

all sighting

and

fire control

equipment.

C h e c k for missing

spare

parts

and

equipment, and replace

shortages.

10. Used Equipment

The

services

required

to insure

that Used materiel.is

in

operating

condition are

identical

with the

services

listed for new materiel

in

paragraph 9 , except for the following

additional

points:

During disassembly of the breech mechanism and the breech

mechanism

parts,

examine all parts closely for signs of wear.

If

wear

appears to

be excessive

replace

doubtful parts with

new

ones,

or with parts that are

declared

usable by ordnance maintenance

personnel.

6 .

Examine the Artillery Gun

Book

0.0. Form 5825) to make

sure

that

this record

has

been kept up

to

date and that all entries

have

been

properly made. Determine whether

all

War Department

Modification Work

Orders

have been applied.

Section

V

CONTROLS

AND

INSTRUMENTS

11 Elevating

Mechanism

a.

E LE V AT ING H A N D W H E E L .

The elevating

handwheel,

on the

right

side of the carriage or mount

(fig.

11), elevates or

de

presses

the weapon when rotated with the

elevating

mechanism

clutch

lever

released.

17

8/11/2019 TM9-335

22/240

E L E V A T

I N G

M E C H A

N IS M

C L U T C

H

L E V E R

The purpo

se

of the 

elevat

in g

mech

anism

clutch le

ver, on  the

  right

  s

id e 

of

the 

car

riag

e (fig

. 

1

1), is  to

 

r

elease

the br

  ke w hich

 lock

s the elevatin

g

mechan

ism. T he

 

c

lutch

lever is

 depres

sed to relea

se the bra

k e.

C L U T C H

L E V E R

P E D A L  

P L A TE .

The

elevating

m echanism

clutch

lever

 

pe

dal plate

  is

connec

ted to th

e clutc

h  lever on

the

right side

 

of

th e

 

mount

 

(fig. 12

) and se

rves

to

 

release the

  brake

 

w

hich locks

 

t

he elevat

ing

m echa

nism. 

The p

edal

p

late is

depress

ed

to rele

ase the bra

k e.

ELEV TING

 

H  NDW

HEEL

ELE

V TING

RC EL

EV TING

ME

CH NISM CLUTC

H

LE

VER

RA

PD 10

7701

18

8/11/2019 TM9-335

23/240

f

 

T

R

N

 

T

R

N

H

W

/

J

B

H

E

N

H

W

C

T

R

N

L

O

 

K

S

C

U

C

L

V

E

R

 

P

P

R

 

P

D

 

7

7

2

5

8/11/2019 TM9-335

24/240

12.

Traversing

Mechanism

T R AV E R SING

H A N D W H E E L .

The

traversing

handwheel,

lo

cated on the left

side

of the carriage or

mount

(fig. 13), traverses

the weapon. The handwheel

is

turned after the

traversing mecha

nism

has

been

released

by

loosening

the traversing

brake.

T R AV E R SING B R A K E HA N DL E.

Rotating

the traversing brake

handle counterclockwise (fig. 13)

releases

the

traversing

mecha

nism.

TRAVERS I NG

HANDWHEE L

TR VERSING

BR KE

H NDLE

RA

PD 89777

13.

Traveling

Locks

Applies

to

Motor Carriage Only)

HO WI T ZER TRAVELING LOCK. The howitzer traveling

lock

is

located in front

of

the hatches on top

of

the carriage hull

(fig.

14) and serves

to

lock the howitzer in traveling position.

C R A D L E

TRAVELING

LOCKS.

The

cradle

traveling

locks

are

located on the left and right sides of

the

platform (fig.

12)

and

serve to lock the cradle in traveling position.

L O A D I N G PLATFORM LOCKING P I N S . These lock pins are

chained to the rear sides of the carriage, near the top (fig. 15)

and serve to hold the platform in traveling position.

S P A D E S U P P O R T I N G A R M LOCKING P I N S . These lock pins

are chained to the rear sides of the carriage (fig. 15)

and

serve

to hold the supporting arms and spade in traveling

position.

W I N C H

R A T C H E T C R A N K .

This crank is located in left rear

corner of carriage (fig. 16) and serves to

release

the spade with

out shock from

the

traveling position, or to raise it

from

firing

position.

/.

C R A N K B R A K E

L E V E R .

This lever is located near the crank

(fig. 16) and serves to

brake

the w i n c h

ratchet

mechanism when

lowering

the

platform.

20

8/11/2019 TM9-335

25/240

U

H

C

L

O

W

E

H

C

 

s

 

c

a

 

«

H

W

I

T

T

N

L

O

R

 

P

D

 

7

7

2

4

 

8/11/2019 TM9-335

26/240

8/11/2019 TM9-335

27/240

R

TC

HE

T BR

KE

 LE

VE

R

W

IN

CH

 

R

ATC

HE

T  C

RA

NK

 

R  

P

1

9

41

1

4.

B

ra

ke

 

M

e

ch

an

ism

 

Ap

p

lies

 

to

 

C

ar

ria

ge

 M

l

O

nl

y 

a

.

A

IR

 

B

RA

KE

S  

T

he

 

air

 b

ra

kes

 on 

all

b

ogi

e w

h

eel

s a

re

 ac

tua

te

d

fro

m

  th

e 

p

rim

e

 

mo

ve

r.

n

 

an

  e

me

rg

enc

y,

 

the

  br

ak

es 

ar

e p

pl

ied

 

aut

om

at

ica

lly

  i

n

th

e eve

nt

 of

a

 b

rea

k-

aw

ay

 fr

om

 t

he

 p

rim

e

 

m

o

ver

.

6 .

HA

ND

  B

RA

K

ES

 

H

an

d-o

pe

ra

ted

 

le

ve

rs

fig

.

17

) se

t 

th

e m

e 

c

han

ic

al b

ra

ke

s o

n 

th

e b

og

ie 

for

 p

ark

in

g.

2

3

8/11/2019 TM9-335

28/240

 

R

A

 

P

 

8

6

 

9

8/11/2019 TM9-335

29/240

K

 

R

P

1

U

8/11/2019 TM9-335

30/240

15.

Breech

Operating Lever

The breech operating lever (fig.

18)

serves to

open

and close

the breech. The breech is

opened

by pushing down the operating

lever catch, pulling the lever rearward

until

breech

thread

sectors

are cleared and then pulling lever to

the

right until

spring

counterbalance acts to

hold

breech mechanism

in the open position.

6. The breech

operating lever

catch (fig.

18) locks

the breech-

lock when in the

closed

and firing position.

16. Lanyard

The purpose of the lanyard

is

to

fire

the weapon. This

is done

by

a

quick pull or snap of the lanyard which

is attached

to the

hammer.

17. Instruments

T E M P E R A T U R E

A D J U S T M E N T SCALE. The

purpose

of

the tem

perature adjustment scale

(fig.

19) is to

provide

a

means

of

main

taining a uniform tension on

the

equilibrators at various tempera

tures. For satisfactory functioning, the temperature adjustment

scale

should

be

set

for a

temperature

corresponding to the ambient

temperature

at

the

time

of firing

the

gun.

Further

adjustment

may be necessary if

the

equilibrator pressure is

not normal.

OIL INDEX.

The

oil

index

(fig. 74)

serves as

a guide

when

establishing

the

proper

oil reserve.

TEMPER TURE DJUSTMENT

SC LE

R A PO 107702

26

8/11/2019 TM9-335

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8/11/2019 TM9-335

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jt~

 

M

a

ke

 

c

er

tai

n 

th

at

h

an

d 

br

ak

es

 o

n

th

e h

o

wi

tze

r c

ar

ria

ge

 

ar

e

se

t,

 an

d th

at

 

th

e l

im

be

r 

a

nd

 pr

im

e

m

ov

er

 are

 

s

ec

ure

d

 

ag

ai

ns

t 

un

- 

d

e

sir

ed

 m

o

ve

m

en

t.  Bl

oc

k 

lim

b

er 

a

nd

 bo

gie

  w

he

els

.

Do

  no

t 

re

ly

 on

 

pa

rk

in

g

br

ak

es

.

St

an

d  c

lea

r 

o

f t

he

  lim

b

er

  an

d

 

tr

ai

ls.

 

Re

m

ov

e 

th

e 

li

mb

er

 

a

s

fo

ll

ow

s:

 A

tta

ch

 p

rim

e 

mover 

winch 

cable 

to limber

lift 

in

g 

sl

in

g a

nd

 t

ak

e u

p 

ca

bl

e

un

ti

l th

er

e i

s a

 sl

ig

ht

str

ai

n o

n 

it .

C

au

tio

n

t

  i

s im

p

or

tan

t

to

 

ha

ve

 

t

hi

s 

sli

ng

 

su

ff

ic i

en

tly

  ti

gh

t

to  

ho

ld 

up

  t

he

 

t

ra

ils

.

R

em

o

ve

 

co

tte

r pi

n ,

 

wi

ng

 nu

ts,

 

an

d e

ye

bo

lt

 sp

ac

er

 p

iec

e f

rom

 

ey

e-

 

b

ol

t  f

ig .

 2

9 .

 R

em

ov

e 

ey

eb

o l

t

hi

ng

e pi

n 

f

ig .

 

3

0)

 

an

d r

em

o

ve

 e

ye

-

bo

lt  fr

om

 

tra

il

  c

lam

p

in

g 

br

ac

ke

t. 

Re

pl

ac

e  h

in

ge

 

pin

. Pa

y

 

ou

t 

cable slowly  

from 

powered  win ch to  

allow  

a 

little 

slack. Use 

prime 

m

ov

er

  to

 pu

ll

 lim

be

r 

fo

rw

ar

d 

sl

ig

htl

y u

n

til

 th

e 

lim

b

er

 lif

t 

br

ac

ke

t

a

ss

em

bl

y be

gi

ns

 to

 

rot

at

e.  E

a

se

tr

ai

ls 

to

 

th

e gr

ou

nd

 b

y 

m

ea

ns

 

of

 

w

in

ch

 

fi

g. 

22

 .

 

R

e

mo

ve

 

tr

ai

l co

up

lin

g 

pi

n k

ey

 

fro

m

 tr

ai

l c

ou

pl

in

g

hi

tc

h 

p

in

. R

em

o

ve

  t

ra

il 

c

ou

pli

ng

  In

'tc

h 

pi

n 

f

ig.

 

22

)

an

d

 

pu

ll

 

lim

b

er c

le

ar 

o

f t

he

 

tr

ai

ls.

 

U

sin

g

 po

w

ere

d

wi

nc

h, 

ta

ke

 in

 ca

ble

 

un

til

 

th

e 

lim

b

er

 

l

if

t

bra

ck

et

 

a

ss

em

bl

y

is ro

ta

ted

 

to  a

pp

ro

xi

m

ate

ly

 v

er

tic

al

 

p

os

iti

on

.

28

8/11/2019 TM9-335

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RA

  P

D 

1 

77 

3

Do

 n

ot

 

r

ota

te

 pa

st

 

th

e v

er

tic

al 

po

si

tio

n. 

A

tt

ac

h 

ey

eb

ol

t

to li

ft b

ra

ck

et

 a

nd

 

to

ho

ld

ing

 

b

ra

ck

et

o

n  d

raw

b

ar.

 

O

ne

 

wi

ng

 nu

t

sh

ou

ld b

e 

o

n e

ac

h

sid

e o

f

d

ra

wb

ar

  an

d 

e

ye

bo

lt

sp

  c

er

 se 

te

d 

in 

the

 g

roo

ve

 o

n

sli

ng

  g

uid

e

fig

.

23

 . T

hi

s 

loc

ks

  l

ift

RA

  P

D  1

0770

4

29

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bracket

assembly

in upright tra

veling) positio

n.

D

isconnect lift

ing

sling

from 

winch

cable and

 

wind

 

up c

able.

A

ttach

running

end

of lifting

sling to

 

re

ar hinge

 pin.

Remov

e safety

pin an

d

nuts

from trai

l

c

lamping bracket

clamp

bolts

a

nd

remove

t

rail cla

mp

ing b

racket. T

he T-bolt can be

removed when

 

tra

ils

are

spread.

All

bolts

and nuts

should

be

assem bled

to

trail

clamping bracket

after

remov

al

to prevent

loss.

Remove the bogie

lifting screw

lock and

covers (fig. 24).

R

emove th

e ends of the four

wh

eel

supporting

cabl

es

from th

e

torque rod

hooks o

n

the to

rque rods

and attach

them to the cro

ss

beam

torque

brac

ket bolt

s on

th

e

bogie cross

beam (fig. 

25

).

Release

the cradle

 

lock fro

m the

cradle (fig. 25). Re

move loading

tra

y from trai

ls. D ig

 

pits

for front

 

spad

es,

then

attach

spades.

Lower

the 

carriage

by

operating the

bogie

lifting

screws

with 

the

bogie lifting

screw ratchet

 wren

ches (fig.

26),

and

contin

ue 

until

the wheels

 

a

re

raise

d com

pletely 

off

the

  grou

nd. Operate both

screws

in

u

nison to

pre

vent c

ramping of the

mechanism

. The wheel

suppo

rting ca

bles provide support

for t

he wheels

when

t

hey are

rai

sed

in firing positio

n.

W h

en

the bearing

 str

ength of the soil is

too low

 for more

permanent emp

lacement of the

materiel, em

bedded logs are

used

railway ties 

may

be

used).

These

are

placed behind 

the

front

and

rear spades

 and dug in

so

as

 

to 

distribute

the force of

recoil ove

r

a

larger

ground area

 and

t

hus prevent

movem

ent of the

weapon

d

uring

firing.

Rem

ove covers f

rom breech

and muzzle

.

/.

In

stall panorami

c telescope

in

its

m

ount.

Relea

se

trave

rsing mechanism

by rotating

the traversing

brake

hand

le

c

ounterclockwise

.

P lace

tools

and

equipment

in

proper

position

for

firing.

1

9.

T o 

Place

Weapon

in

Fi

ring P o sition W

h e n Mounted

on

Howitzer

Motor Carriage

 

M43

Remove

the ho

witzer

co

vers 

and store them

 

out of the

way

in the

place assign

ed

for th

em; li

kewise store

al

l the other

equip

ment not required

for o

peration of the

weapon

.

Unfasten

cradle traveling locks from

the crad

le a

nd

pla

ce

them out

of

the

way.

Unlock t

he tube

tra

veling

lock by

loosening the nut

which 

secur

es

the upper half

of this

lo

ck . 

Rotate th

is upper

ha

lf up

and

 

o

ff

the

howitzer tube. The

n eleva

te

th

e howitz

er slightly in  

o

rder

to push

the traveling lock do

wn in

 

the

 

la

tched position

on the hull.

Remov

e the

locking pins

which hold

the

top suppo

rt

arm

s of

t

he

sp

ade

assembly. Release w

inch ratchet arm

and brake, to

lower

spade

to the g

round. Then back

up

v

ehicle to

force spade prongs

30

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B

OGIE

LIFTIN G

  SCRE

W

COVER

 

D

33759

O

UTER

BOGIE

 

LIFT

ING SC

REW

B

OGIE

LI

FTING S

CREW

 

LO

CK 41

 L l 610

 35

RA

PD

107721

RA

 

PD

107

712

 

8/11/2019 TM9-335

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EA

PD

86546

into th

e ground

Wh

en

in its pr

oper

position the

spade mu

st be

flush with

the ground

and the

spade 

stops seated a

gainst the

 hull of 

the

veh

icle

A

pply the veh

icle steer

ing brake

s and  lo

ck in po

sition.

32

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20. Loading

the

Howit

zer

To

OPEN

B R E E C H

Remove the  firing mechanism

Ml as

fol

lows:

( 1 )

Pull

th

e percussion

ham

mer

locking pin knob (fig. 

27) to

the

left

until the

percussion

hammer

is

free

and

the

knob

is

free

to rotate. Turn the kn

ob until the sm all pin

in

the

knob

en

gages

th

e shallow recess

 

in the hou

sing. The knob is left in this

'position

during

firing.

(2)

Pull

out

the

firing

mechani

sm

bloc

k handle, rotate the firing

mech

anism

counterclock

wise until the thread is

disengaged, then

withdr

aw 

the firing m echanism

 to the rear.

(3)

Push

down

on

the

breechblock

operating

lever catch,

and

pull the breechblock

operating

  lever

down

to a

horizontal

position.

S wing the

operating lever toward the muzzle of

the

how

itzer.

6. To L O A D

PROJECTILE.

A

loading tray (fig.

36) is

furnished

for

howitzer and carriage

Ml,

and

a load

ing ramp (fig. 36) for

ho

witzer

and m

ount

M1 7 ,

both to provide

for ease in

loading

and

to protect th e threads

in the breech recess. 

When loading tray is

 

u

sed, the

p

rojectile

is placed on the loading tray, th e  tray is then

 

lifted

by

the

gun

crew,

and

the

front

of

the

tray

so

placed

that

the pro

jecting brass

lug rests

in a

b l

ank portion of

the interrupted

bree

ch thread. W hen the

loading ramp i

s

used, it

is

so

placed

that the

project

ing

brass lug rests in a blank

section of

interrup

ted

breech

thread w

hile the rear en

d of

th

e ramp rests on the

loading

pla

tform. The

proj

ectile is pushed clear of th

e loading

tray 

(or

ra

mp) by use

of

the ramm

er. Then the

tray

(or ramp

) is removed

and

the projectile

is 

rammed into

position in the forcing

cone. It is

important

that

projectiles

be

rammed 

with

a

uniform

force

since

variatio

ns in the ramming force w

ill cause slight variations

in

the range. It

is

also im

portant that the rotating

bands o

f

a

p

rojec

tile be not

damaged,

as

such d

amage is likely to cause errat

ic

fir

in

g.

To

  avoid damage to rotating bands

, the

grom

met should not

be

removed  until the shell

is prepared for 

loading.

To L O A D P R O P E L L I

N G

C

H A R G E It

is 

not ne

cessary

to us

e the

loading tra

y

when placing the pow

der

charg

e in the breech.

Care

must

be

taken

to

insure

that

the

igniter

end of

the powder

charge

is

located

at the

 rear.

To C L O S E T H E B R E

E C H Pull th

e breech operating lever to

ward the 

breech

and

  then push

it

to a vertical

position.

T

o L O D

PRIMER.

The breech must be closed b ef

ore assembling the fir

ing

mechanism M

l to

the breech.

33

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H o l d  the f

iring m

echanism Ml in

 

one

  hand and slide

the primer

into the U

-shaped  groove

fig. 28).

Place firing  mechanism

  into

breechblock

 and screw

it

all

 the way

home.

 

..- -.- 

,*£-'.S* .̂i

:^ . -

' R A P D

72825

21

Firing

a.

Lay the howit

zer in elevat

ion

and

traverse.

6.

Firing is

acco m

plished

by a quick pull

o r snap o

f the lanyard

attached to

the

percussio

n hammer

which causes

  the hamme

r

to

strike th

e

firing pin.

W hen

traveling,

or

for

reasons

of

safety

the 

percussion ham 

mer

 on firing

mechanism Ml

m

ay be loc

ked in a

neutral position

 

by

the percu

ssion h

ammer lock pin.

In case o f m i

sfire, refer to

 

par

agraph 42.

22 To

Place

 Weap

on in Traveli

ng

Pos

ition

a. R A

ISE

C A R R I

A G E . Detach

the rear

spades from  the

  trail

s.

Swing

 

the

trails together. Op

erate

the

bogie

  liftin

g mechanism

 

to

raise

the

carriage

from the 

ground

fig.

26).

Raise

the

carriage

as

high as

the lifting

mechanism will pe

rmit.

See t

hat

the

 p

ointer

plates

on th

e

bottom

carriage a

re

alined with the i

ndicator plates on th

e bogie cr

oss beam fig.

29).

This

is impo

rtant

since

at times gravel m

ud, dirt,

or

other foreign

m

atter may lodge

on the

lower

conta

ct surf

ace

and,

if not

cl

eaned

before

the carriage

is raised

and

appar

ently

up

tight,

will

be

shake

n loose

b

y

the road vib

ration and the  re

sulting clearanc

e

 

8/11/2019 TM9-335

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start

wing nuts (fig. 32),

and

tighten securely. Insert cotter

pin.

W hen eyebolt

is securely in place, remove lifting

sling

from

winch

cable and attach sling to the

hook on

the trail (fig. 3 3 ) .

W in d

up

winch

cable.

RA

PD

59134

RA PD

59129

C O N N E C T A I R B K A K E H O S E . Couple air .brake hose

together,

passing

them

through hose guide. Hose are

arranged for

straight

connections

between

limber and prime mover, and

for

cross con

nection between limber

and

trails

(fig. 33).

38

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INSP ECTION.

  A

thoro

ugh

inspe

ction

of

 

th

e a

ssembled

lim ber sh

ould be m ade

before

m o

ving. Points

to be cov

ered are.:

  1 ) Trails must

be

s

eated properly

  on 

limber

lifti

ng bracket

limber

M 5).

  2 ) All

nuts must

be

drawn

up

tight

and

locked

with 

cotter

pin

s.

  3 )

The eyebolt m ust

 be drawn up

  tight by

the tw o wing nu

ts

l imber

 M 5 ) .

  4) A

ir hose mus

t be insta

lled

properl

y an

d

b

e free to turn

with

the  limbe

r.

LOCKING 

M A T E R I

A L F O B T R A V

E L I N G . 

1 ) Connect  cradle

 

lock

to the cradle.

(2)

Lock

trav

ersing mech

anism by rotatin

g the travers

ing

brake

 handle

clockwise.

(3) Remove pan

oramic

telescope

fr

om its

 

mount.

(4)

Replace breech and

muzzle

covers.

(5)

Install

blacko

ut

light on muzzle and

conn

ect.

23 T

o Place

Weapon

 

in r

aveling Posit ion W

hen Mounte

d

o

n  

Howitzer Motor

Carriage

a.

Unlatch

and swing

the

howitzer

traveling

lock

up

to

a

verti

cal posit

ion.

De

press the howitzer

onto

t

he t

raveling

loc

k and

cl

amp

the

uppe

r

half

of the lock aroun

d  the tub

e. Fasten

 

by

tightening the nut.

6 .

Fasten the cradle

trave

ling

loc

ks

to

the crad

le.

In

stall the howitzer

covers.

M ov e the

vehicle forwa

rd

to

 free the spade from

the ground.

Lift the spade to

tr

aveling

po

sition by means

o

f 

the spade

winch.

Insert

spade

support

arms through

the

brackets

and

then

insert

the l

ocking pins.

Section VII

O

PERATION

UND

ER

UNU

SUAL CONDIT

IONS

24 General

When operatin

g the mate

riel under unus

ual conditions

such as

extreme high

or low

temperature

, 

sever

e dust

o

r  sand c

onditions,

or locations

near salt 

water,

the 

precautions

given

in

this

section

must be followe

d.

25 Extreme

 

Col

d

a. G E N E R A L .

When

prevailin

g temper

atures below

0 F. are

en

countered, and when im pr

oper operatio

n is

experience

d

be

tw e

en

0

F. and

32 

F.,

it

is essential

that

the

followin

g points be

ob

served:

40

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(1)

Ke e p

all

parts thoroughly clean.

(2) Leave no metal

surfaces

exposed

without

a

protective

film

of

lubricant.

 3)

D o not let snow and ice collect on moving parts. Whenever

the

weapon

is

to

remain

idle

for

a

period

of

time, secure

the

howitzer covers

tightly. W in d

will drive snow

under loosely fitting

covers, resulting in the formation

of ice which

may interfere with

the operation of the

weapon.

 4)

D o not bring any materiel indoors unless it

is

absolutely

necessary. It

is

best to leave it outdoors, but

covered

to protect it

from

the snow.

(5)

If

it is necessary to

bring

the

howitzer, sighting and

fire

control

equipment,

parts,

or assemblies indoors,

after

having

been

outside

at low temperatures,

vapor

in the air will condense on the

cold

parts.

If it is not dried off, this condensed

moisture

will

cause rust

and corrosion

of

the parts. Therefore, wipe the tube

and all bright parts

dry

when the equipment reaches room

tem

perature, and

recoat

with

lubricant. Inclosed

mechanisms

(such

as

closed gear

cases,

etc .) may

be

damaged by

condensation

on

the

insides

of the

mechanisms. If the

materiel is operated

indoors

while

the

moisture

is

present,

the

moisture

will

form an

emulsion

with the lubricants which will necessitate the removal of all

grease and

the relubrication

of

the

materiel. If the materiel is

taken outside with

this

moisture

present,

the parts will become

covered

with frost

and may not

function.

 6) All moving parts

of the materiel

should

be

exercised

fre

quently. Traversing

and elevating

the

gun is helpful

in reducing

the effort required to turn the handwheels.) Intervals

of exercise

will depend upon

the existing temperature the

lower

the

tem

perature,

the more frequent the exercise.

(7) To prevent

materiel

from

freezing

to the ground, see that

the equipment is coated with some substance to which the

ice

will not stick, or

that

a protective

layer

is placed on the

ground

for the materiel to

rest on. Pedestals, trails,

outriggers, skids

of

generating

units,

points of tripods, and

other

metal parts

that

rest

on

the

ground,

c a n be covered with grease to prevent

them

from freezing to the

ground.

Tires and packing

or carrying

cases,

as

well

as

the

previously mentioned

parts,

may

be

placed

on

straw,

hay,

or waterproof paper

such

as tar or

roofing

paper.

(8) W hen materiel is protected

with a

canvas or

other type

of

cover, moisture will form on the metal

surfaces. To

prevent

rusting,

remove covers

at least once a

week, and

thoroughly dry

and reoil all surfaces.

B O R E CLEANING. 1)

W hen

cleaning

the

bore with

rifle

bore

cleaner at temperatures below 0 F., wipe

41

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the 

bore

dry and oi

l.

Do n

ot allow 

the

rifle

bore cleaner

to remain

in the bore, as freezing of th

e

clean

er in the bore may make firing

 

dangerous.

 2) In

applying

oil to

the bore

after

cleaning, care must

be

taken

to work the oil in

we

ll so that it

will

reach

all

surfaces

of

the

lands

and

grooves.

RECOIL MEC H A N I S

M . 1) The care will be the

same as

f

or

normal conditions

with

the

exception that the recoi

l mechanism

will be

exercised more frequ

ently. The frequency of

 

exercising

will

depend upon the temperature the

lower the temperature the

more frequently

the recoil mechanism

should

be

exercised.

 2) It

can

be

expected that the cyclic rate

of fire will

be

less

under

extreme cold weather

conditions.

Do

not

remove recoil

oil

to

increase

the

cyclic

rate

of

fire.

A s firing continues, the

oil

will

heat up until

the

normal rate

of fire

is

obtained

TOP

A N D

B O T T O M C A R R I A G E

Keep

d

rain holes

in

top a

nd

b

ottom carriage open, and

avoid

accum

ulation of s

now

on

 

carriage.

ELEVATING

A N D T R A V E R S I N G

 

ARCS. 

Brush ic

e

and snow

from

trav

ersing and elevating arcs

with stiff

bristl

e or

wire

brush

before operation.

/.

TIRES.

1)

Special

care must

be

given to

tires

during

cold

weather. Check

air

pressure

frequently and keep t

he

tires free

o

f ice. W he

n a weapon is em placed for

a

long

time, tires will

devel

op

a

flat surface a

t the contact point

with

sno

w or  frozen

g

round.

Care

should

be

taken, when trav

eling

wi

th the  weapon,

to

keep the

speed at a minimum until

the tire has regaine

d its

original

shape.

 2) To

avoid developing flat surfaces,

rest

the

 weapon on its

bottom

carriage, with

the

bogie

wheels

raised,

whenever

it

is

inactive.

BRAKES. 1)

Air brakes require

special care

during cold

weather.

Drain

air reservoirs after'

use. This will blow 

out

moisture formed

by compre

ssed

air and

will

prevent

freezing

of lines and brakes.

Care s

hould

be

exercised in connecting air hoses

to

prime mover

to

prevent

cracking or breaking

when bends

are 

too

sharp.

  '2)

Apply

proper lubrication t

o all

joints and

connections. U se

 

wheel

chocks in preference

to

set

ting brake

when

the

howitzer is packe

d.

FIRE

C O N T R O L

EQUIPMENT. 1) W hen

 

using opti

cal

in

struments in  cold

weather,

the operat

or should be carefu

l

not

to

breathe

on the oc

ulars. When the breath hits the lenses,

the m ois

ture in

the

 w

arm

brea

th condens

es

on

th

e

lenses and fogs them.

42

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Thi

s moisture

 will then

freeze, making

it impossi

ble to

o

bserve

wi

th the instru

ment.

(2 )

 

O ptical surfaces 

shou

ld be cleaned in cold weather

by

 

rub

bing

gently with dry lens-tis

sue paper

. To rem

ove oil film,

bring

instru

ment

i

nto a war

m in closure and

allow it to

reach roo

m

temperature 

before applying

liquid

lens-cleaning

soap.

26. Severe

D ust o r S an d

C ondit ions

W

hen

the

howi

tzer is active in

sandy or dusty areas,

clean

and lubricate at

 

fre

quent in

tervals,

as

the lu

bricant

will pick up

san

d or du

st,

fo

rming ah

abrasive mix

ture. Clean

and lubric

ate

after action.

Exercise pa

rticular ca

re to keep

sand

and 

dust out of

the

mechanisms

and

oil

receptacles

when 

carrying

out

inspection and

lubrication

operat

ions,

adjustmen

ts,

and

r

epairs.

K e

ep

the

mount cov

ered w

hen

practic

al. C o

ver

the

breech

m echan

ism and m

uzzle as of

ten as conditions permi

t.

2

7.

H igh Humid

ity

E x t r e me

Moi s tu re

a n d Salt Wate

r

a

. T

he amount

of

moisture

  in the

atmosphere deter

mines

the

rate o

f

c

orrosion 

an

d the ra

te of

 

loss

of protective q

uality by

lubricant

films

used

to

prevent 

corrosion

of

metal surfaces,

such

as

t

he

howitzer bore, breech

mechanism, etc

., as the water

will

emulsif

y

the

  lubricants

and destroy their

  corrosio

n-preventive

qualities.

 Inspect

parts frequently

for corros

ion. The more

mois

ture presen

t, the

greater the tendencies

are

for

the materi

el to

cor

rode and

deterio

rate. Th

erefore, inspectio

n,

cl

eaning,

and lubri

cation 

should

be

more frequently and

 carefully

  performed, de

pen

ding upon

the moisture pre

sent. Salt in the

air, s

uch

a

s

occurs

near salt water

areas, and high

temperatures,

add to 

the

corrosive

activi

ty of mo

isture.

6

. K eep the bore of t

he tube a

nd the 

b

reech mechanism

heavily

oiled,

and watch fo

r

signs 

of

 

rust

.

Coat

exposed

unpain

ted su

rfaces,

such as the bore and the

breech and firing

 

mechanism

s,

as indicated in the War Departme

nt

Lubrication

  Order.

In

moist warm c

limates,

covers

and

other items

will

de

teriorate

from 

mildew,

etc.,

or may

be

attacked

by 

vermin.

Mois

ture under the

covers also ca

uses

rusting

 of the p

arts. To prevent

this, th

ese items should

 

be r

emoved, aired,

and dried dai

ly .

S

ection

VIII.

D E M O L I T I O N

 

T O P R E

V E N T E N E M

Y U SE

28

. Gene

ral

a. The

dest

ruction

of the materiel, subject

to cap

ture or

 

aban

donment in the comba

t zone,

will be undertaken

 by

t

he usin

g

arm

43

8/11/2019 TM9-335

48/240

only on authority

 deleg

ated by th e

  division or higher

commander

as

a

co

m mand functio

n

when

such ac

tion is

deemed nece

ssary

as

a

final resor

t to keep the m

ateriel from

reaching enemy ha

nds.

Adequate destru

ction of artiller

y materiel m

eans dam

aging

it 

in s

uch a way that th

e enemy cannot restore it

to usa

ble condi

tion

in

the

combat

zone

either

by

repair

or

by

carinibalization.

Adequat

e destruction req

uires that:

(1)

Enough p

arts essential

to

t

he operation of

the

m

ateriel

must be dama

ged.

(2) Parts must

be

dam

aged

beyond rep

air in

the

com bat zo

ne.

(3)

T

he same

parts

must

 be destr

oyed

on

all mater

iel, so

th

at

the enemy

cannot m ake up one ope

rating unit by

 assembling

parts

from

 several

partly destroyed

units.

The

tube

and breech 

are

the

most

vital

parts

of

any

piece of

artillery.

 The

se

are

 the first

things to

damage.

A

fter the

tube and

breech,

 in the order of importan

ce, co

me the

recoil

mecha

nism,

sighting an

d fire

 

con

trol equipment,

carriage,

t

ires,

gun book, and

 

firin

g

tables

.

29. Metho ds

G

ENERAL.

(1) The destruction

procedure

s

outlin

ed are ar

ranged

in order of effectiv

eness. Destructi

on should

be

ac

com

plished by

method

No. 1, if possible.

If method No.

1

cann

ot be

used, destruct

ion should

be accomplishe

d

by

one o

f the other

methods

 outline

d,

i

n the priority

 

shown.

(2)

Wh

ichever meth

od

is used

, the

 

sequenc

e outlined

must be

follow

ed.

Uniformity

of destru

ction will then

 be obtained

, whether

or not the meth

od

is carri

ed

to completion.

(3)

Certain

of the meth

ods outlined

 

require

special

tools

a

nd

materials,

such as

nitrostarch

and

incendiary grenades,

which

may

no

t be items of

issue

 

normally.

The

issue

of suc

h s

pecial tools

and

 

m

ateriel, the v

ehicles for

which issued, and

the conditions

 

under

which destruction

will be e

ffected,

are 

command d

ecisions

i

n

each case,

according

to the tactical

situation.

(4)

D

etach all optica

l

sig

hts. If evacua

tion  is possi

ble, carry

the sights;

if evacuation

is not possib

le, smash th

e sights co

m

pletely.

METHOD

N o.

1 DE STRUCTIO N

O F

TUBE,

BREECH,

A N D

RECOIL

M E

CHANISM.

(1) Open drain

plug

on recoil mechanism, all

ow 

ing

recoil fluid

to

dr

ain out. It is

not nec

essary to

wait

for the

recoil fluid t

o

drain

 co

mpletely before f

iring the howi

tzer

step

 

(

4 )

below).

(2)

Place an arm

ed

safety

pin rem

oved)

high-explosive, anti

tank grena

de M9A1, or

 armed

sa

fety pi

n  remove

d) antitank

rocket

M 6 in the  tu

be

with the 

nose

end

toward

  the

  rear. The

44

8/11/2019 TM9-335

49/240

gr

enade

or rocket

 must

b

e  cente

red in th

e

tu

be, using a

wooden

adapter. A

n

a

lternate

for th

e wooden adapt

er

is

  the

 

use

  of w

aste.

  3) Insert

an unfuz

ed hig

h-explosiv

e shell with pro

pelling

ch

arge int

o

the ho

witzer

and  close

 

the

  bree

ch. Ba

se-detonat

ing,

high-e

xplosive

shell cannot b

e

u

sed

in

this

method.

 4)

Fire

the

howitzer,

using

a

lanyard

at 

least

100 

feet

long.

The man firing

 should

 

b

e und

er

c

over to th

e rear of

the

piec

e

and

approxima

tely 2

0

of

f the  line of

fire. Elaps

ed tim

e: approxi

m

ately 2 to 3

minutes.

  5

) The dang

er

zone i

s

approx

imately 50

0 yards.

M E T

H O D N o. 2

1) Inser

t TNT bl

ocks into

the bore near

the

 

muzzle,

and

in the firing

  cham

ber. Close t

he b

reechblock

 

as

fa

r

as

pos

sible

without

damagin

g

th

e safety fu

ze.

P

lug t

he

mu

zzle

tightly with 

earth

to

a 

distance 

of

approximately

3

calibers 

from

the muzz

le. Detonat

e the explosive 

charges

 simultane

ously. Th

irty

to fift

y Va-pound

TNT blocks

 

w

ill be ne

eded  for e

ffective dem

oli

tion. If

 

it

is not

 possible

to  plu

g

the 

bore, a

larg

er

numb

er

of

bloc

ks

w

ill be needed

  for effe

ctive dem

olition.

  2) Ram

  a h

igh-explos

ive

shell

with

out base

fuze) into

  the

fo

rcing cone, and

place T

NT blocks

behind it

as specified abov

e.

C

lose

the

b

reechblock

  and d

etonate the

TNT ch

arge.  A

sufficient

length

of

safety

fuze 

should

be 

used

to  

permit

personnel 

to

reach

safety zone 

or

cov

er. T

he fuze may be

route

d

through

 th

e

primer

 

hole

i

n

the s

pindle.

  3) T

he

nu

mber of n

itrostarch

blocks to

  be used is

  an esti

 

mate onl

y and

has not

 

b

een pro

ved by tests.

M E T H O D N o. 

3 .

1) Place

unfuzed,

  incendi

ary grenade

s

M14 on

their sides,

one

on

t

op  of ano