TM9-424 6Inch Gun M1900 Barbette M1900
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
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WRDEPIRTMENT
TECHN C 4L
MNUL
T
M
424
Thi s TMsuper sedes OF SB 6 B 16 dat ed 4 Aug 42 andWDT 9 424 1 dat ed 30 Oct 44
Thi s
TMuper sedes
vort i ons of
ordnance
Documents
No 1680 dat ed
1 Mar
18
and
No 1688
dat ed
9 Oct 12 whi ch
appl y t o
t he
mater i el covered i n
t h i s
TIMhowever t hese Or dnance
Document s
r emai n
i n
force
u n t i l i ncorporated
i n
al l
ot her
aff ected
TMs or s p e c i f i c a l l y
r esci nded
6-I NCH
SE CO ST
M TEREL
GUNM1900MOUNTEDON
RRETTE
C RR GEM1900
W4R
DEP RTMENT
rA
RESTRCTED
DSSEMN TIONOF RESTRCTED
M TTER
Noperson
i s
ent i t l ed sol el y by vi r t ue of hi s grade or pos i t i on t o
knowedgc
or
possessi on
of
c lassi f i ed
matter . Such matter
i s
entrusted
onl y
to those
bdi vidual s whose
of f ic ia l dut i es requi re such
knowedge
or
possessi on
See al so
paragraph
236 R380 5
15
March 1944 .
26 IL R H
2945
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WARDEPARTMENT
Washi ngt on 25, D
C
26
March
1945
TM9- 424, 6- i nch
Seacoast
Mat er i el
Gun M1900 Mounted on
Barbette
Car r i age
M1900
i s
publ i shed
f or
t he
i nf or mat i on
and
gui d-
ance
of a l l
concer ned
C
AG 300
. 7
11 Mar 44
r
0 300 . 7/ 737b
BYORDEROF
THE
SECRETARY
OF
WAR
OFFI C AL
J
ULI O
Maj or General ,
The Adj utant Gener al
GC
MARSHALL
Chi ef of
Stag
DSTR BUTI ON AGF 10 ; ASF 2 ;
Dv
ASF
1
; T
of Opns 10 ;
Def
Com 3 ;
Sectors
3 ; Arms
v
B
d
2 ; Tech
v
2 ; SvC 10
; PE
Marked f or OdO° °
S
; Di st
O
5 ;
Di st
Br
O,
3 ; Reg
O, 9 3
;
Decent r al -
i zed
Sub- O,
3 ; Establ i shment s, except Am
3 ;
USMA 20
Ref er
t o FM21- 6
f or
expl anat i on
of di str i buti on
f or mul a.
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ONTENTS
H PTER
5
ORGANZATI ONAL SPARE PARTS
NDACCESSQRIES
70 1d0
83 109
H PTER6 SUBCALI BEREQUPMENT
101 114 109 124
H PTER 7 PREPARATION OF MATERI EL FOR
USEUNDEREXTREMECON D
TIONS
k5 119 125 ?27
H PTER
8
SEACOASTARTI LLERY
PRESSURE
TESTING 120 x
24
128 X29
H PTER
9
REFERENCES 125 128
13 X 133
NDEX
134 136
Paragraphs r aget
H PTER1 I NTRODUCTION 4 1 4
H PTER
2
GUN
ND
CARRI AGE
5 50 5
59
SECTION
I
;
Descri pti on of
gun
5
8
5
11
11
Descri pti on of car ri age
9
18
12
18
I I I
Operat i on 19 25 18 24
I V Lubri cati on 26 28 24 30
V
Mal funct i ons
and corr ecti ons
29
32
30
33
V Care and
preservati on
33 40 33 55
V I I nspecti on andadj ustment 41 49 55 58
V I I Repai r 50 58 59
H PTER3 SIGHTINGEQUPMENT
51
58
60 66
H PTER4 MMUNTION 59 69 67 82
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T
9 424
c
w
c
w
U
w
m
c
c
e
c
m
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Pars
2 3
3
CHARACTERSTICS
I ntroducti on
2
2 Complete
i nstr ucti ons on
how
o
make ent ri es i n
the Ar t i l l er y
Gun
Book
are
conta ned
t herei n I t i s absol ut el y essent i al
that the
gun
book ent ri es be kept compl ete
and
up-to-date I n order
t o
f ac i l i ta te proper
ma ntenance
of
the
cannon and
i t s rel at ed mat eri el
t hat i s carr i age recoi l
mechani sm
and
associ at ed f i r control
equi p-
ment and t o
avoi d
unnecessary
dupl i cat i on
of
repai rs
and ma nte-
nance the
f ol l ow ng
addi t i onal
entr i es are t o bemade i n thegunbook
a
A
record of
complete
Modi f i cat i on
Work
Orders
Thi s
record
shoul d
showthe date completed and bear the si gnat ur e
of
the
of f i cer
or
mechani c
r esponsi bl e
f or compl eti onof themodi f i cat i on
b ecord of seasonal changes of
l ubri cant s
and
recoi l
oi l i n
suf f i ci ent detai l t o prevent dupl i cat i on and af f ord
proper i dent i f i cat i on
by the
i nspect or
3 Theesti mated accuracy l i f f or
thi s
gun i s 1 250 rounds
h
Fi el d
Report of Acci dents Whenan acci dent
i nvol vi ng
am
muni ti on
occurs duri ng pract i ce the
i nci dent
w l l be reported as
pre-
scri bed
i n
AR 754-10
by
the
ordnance
of f i cer under
whose
super-
vi s i on the ammuni ti on i s ma nta ned or i ssued
Were
practi cabl e
reports
coveri ngma functi ons
of
ammuni ti on
i n
combat w l l be
made
t o the Chi ef of
Ordnance,
gi vi ng the
type
of
mal f uncti on type
of
ammuni ti on,
the
l ot number of
the
complete
rounds
or
separat e l oad-
i ng components, and
condi t i on under which
f i r e d
c Unsati sfactory Equi pment
Report
Suggest i ons f or i mprove-
ment
i n desi gn ma ntenance, saf ety and ef f i ci ency of operati on
prompted by chroni c
f ai l ure
or
ma functi on
of
the
weapon,
spare
parts or
equi pment
shoul d
be reported onWAGO
Form
No
468
Unsat i sf act ory
Equi pment Report,
wth
al l pert i nent
i nformati on
necessary
t o
i n i t i a t e
corr ect i ve
act i on
The
report
shoul d
be for-
warded
t o the
Of f i ce Chief
of Ordnance, Fi el d Servi ce
Ma ntenance
Di vi si on through commandchannels
i n
accordance
wth i nst ruct i on
No
7 on
the
f orm
Such suggest i ons are
encouraged i n order t hat
other
organi zat i ons
may
benef i t I f
W
AGO
Form
No 468 i s not
avai l abl e
ref er
to
TM7-250 f or l i s t of data
requi red
on
Unsat i s-
f actory
Equi pment
Reports
d
Battery
Empl acement
Book ABattery
Empl acement Book
w l l al so be
kept
f or each battery
For i nformati on on care of thi s
book,
and
entr i es
t o
be made
t herei n
ref er
to
TM
-245
a The6- i nch
GunM19
i s
a
manua l y operated
rapi d
f i r
gun
wth
amaximum
ange
of 17, 000 yards at 20
degrees
el evat i on
The
gun
f i r s
separ at el y l oaded armor-pi erci ng
or hi gh- expl osi ve ammuni -
t i on and
i s
norma l y
f i r ed el ect r i cal l y by
means
of an el ect r i c type
pri mer and
a magneto
I f necessary
i t
can
be f i r e d
manual l y
by a
l anyar d
usi ng a
f r i c t i o n type pri mer
Safety
devi ces are
provi ded
to prevent
premature
di schargeof
the gun
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TM
9-424
Pars
3- -4
I ntroducti on
b Arange drum
and
an azimuth c i r c l e are provi ded on the
car
r i age f or di r ect i ng
the gun Both
e l evat i on
and
t raverse
are
mnu-
al l y operated
c The
gun
recoi l s
i n a c radl e
whi ch
carri es the t r unni ons The
recoi l
i s
absorbed
by
spr i ngs
and
a hydraul i c
recoi l
cyl i nder
The
recuperator spr i ngs
re turn
the
gunt o
battery
d The
gun
i s
munted on
a barbett e car r i age Asteel
shi el d
4x/ 2
i nches
thi ck
protects
the
front of
the gun agai nst enemy f i r e
and
bombf ragmnts f i g
1
4 TABULATEDDATA
a
GunM 9
Type
of bar r el
.
Bui l t - up
Type of breech
Lever- pul l
Type
of
breechbiock
i nt err upt ed thread Four - sector par al l el
Cal i ber 6
i n
Length
of
bore-
_
SO
cal
Total
l ength muzzl e
t o
breech
f ace 310
4
i n
Length of barrel
_ _
302
9
i n
Length of r i f l i ng _
254
14 i n
Ri f l i ng or i gi nal
tube
:
Tw st , r i ght - hand, sem- cubi al
parabola
Starts
one turn 50 cal
and
i ncr eases
to
one
turn 2S
cal
Pr i or
to 1918
After 1918
Number
grooves
and
l ands
. 36
54
Wdth
of
l ands . 0 . 15 i n
. 14
i n
Wdth
of
grooves . 4. 3736
i n
. 2091 i n
Depth of grooves 1 1 . 04 i n . 45 i n
Ri f l i ng
l i ner
:
Tw st ,
uni form
r i ght - hand
One t w s t
i n
25 cal
Number
of
grooves
and
l ands 76
Wdth
of
l ands
0 117
i n
Wdth
of
grooves
0 131
i n
Depth
of
grooves
0
05 i n
Wi ght
of bar r el 19,1141b
Range
17, 000 yd
Muzzl e
vel oci ty-
105-pound
proj ec t i l e 2, 804
f ps
108-poundproj ec t i l e
2, 600
f ps
Travel
of
proj ec t i l e i n
barrel
256
. 325
i n
Center
of
gravi ty di st ance f rommuzzl e
210 15
i n
b 1. 457-i nchSubeal i her
Gun
Over - al l l ength
of tube
72. 85
i n
Wi ght of gun
and
adapt er s 138
l b
3
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Par 4 9-424
I ntroducti on
Length of bore
50
cal
Dameter
o£ bore
1. 457 i n
Wei ght
of pr oj ect i l e 1
. 457 l b
Type of
primer I gni t i on 20
gr ai ns
Ri f l i ng
Length 66
. 552 i n
Number
of grooves 12
Twst, uni f orm r i ght - hand
Oneturn
i n
30
cal
e
Ammuni ti on
Armr-percing 105and
108
l b
H gh-expl osi ve
_
90
1b
Chamber
capaci t y 2, 114
cu
i n
Chamber di ameter max 8 i n
Wei ght
of
powder
charge
32
or 37 l b
d Barbette Carri age
Model of 1900
Total weight gun and carr i age
wthout shi el d approx 19
tons
Total weight gun, car r i age, and shi el d approx 45,568
l b
Dameter of empl acement approx __
19
f t
e Recoi l Mechani sm
Type
Hydrospri ng
Number of
hydrau i c
cyl i nder s
1
Ori f i ces
Threegrooves
Buf fer
Dashpot
Recoi l oi l
Recoi l oi l
l i ght
Normal l engt h of recoi l
14 i n
aximum
engt h
of
recoi l
15
i n
Capaci ty of recoi l cyl i nder 3 gal
Number
of
spr i ng cyl i nder s 2
Spri ng pressur e
44,000 l b
f Traverse
Traverse
360
deg
One handwheel
turn 2 . 78
deg
E f f o r t requi red to
traverse
10 l b
Operati on
Manual
g Elevati on
aximum
l evat i on
__
__
20
deg
355
ml s
aximumdepr essi on
Mnus
5
deg
mnus 88 9 ml s
Elevati on f or l oadi ng
10 deg pl us or
mnus 1
deg
177
8 ml s
pl us
or
mnus
17 8
mls
Average
ef fo r t t o el evate or
depress
6
to
8
l b
One
handwheel turn
0. 37
deg
6
6
ml s
Operati on
Manual
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TM9 424
Par
S
5
GUN
BARREL
CHAPTER
2
GUN
ANDCARR AGE
Secti on
DESCRPTION
O
UN
a Thegun
bar r el of
M19
i s of the
bui l t - up type, constructed
of
hoops
j acket,
tube
or
tube wth
l i ner r ecoi l
band and hi nge
pl ate,
and
i s provided wth two keys or r i bs tQprevent rotat i on
of
the
gun i n munt
b The
breech
end of
the barrel i s constructed t o form
a
threaded
recess
i n whi ch the breech bushi ng i s
screwed
e
Thebreech bushi ngact s as the l ocki ngmember f or thebreech-
bl ock
d The hi nge pl ate i s provi ded wth tugs f or the
breechblock
car-
r i er
hinge
pi n
e The r ecoi l band - at the breech end of the barrel has a l ug t o
whi ch the r ecoi l
pi ston
rod i s attached Thi s rod carr i es ayoke t o
t he
ends
o
whi chthecount err ecoi l
spr i ng
rods
ar e
bol ted
f
The
tube
i s bored t o
form
chamber and bore Theseat f or the
gas check pad i s at the rear of the powder chamer The
powder
chamer at the f r ont narrows
t o
form
he
cent eri ng sl ope which
gui des
the
proj ect i l e
i nto the
f orci ng
cone The f orc i ng
cone
i s tapered t o
gui de
the proj ect i l e
rotat i ng
band i nto the
r i f t i ng
The bore i s
r i f l e d
throughout
g The
tubes
f or
M19
have
an
esti mted
l i
of
800
rounds
On
guns
havingthe
ori gi nal tube not
r el i ned , the
r i f l i ng
i s sem - cubi cal
parabol a
and not
uni form
On
guns
whi ch
have
been
r el i ned,
t he
r i f l i ng
i s usual l y
uni form
h
I n
cases
where the
seats f or thegas check
pads have been
en-
l arged, a
mrki ngpl ace i s f astened
t o
the hinge
pl ate, which states
the
extent of enl argemnt
i n si ze
and
the advance of the
gas
check
seat i n
the t ube, Theseguns r equi r e
speci al ri ngs, gas check
pads, and
spi ndl e
di sk,
and som
may
be
found
to have an enl arged obturator
spi ndl e
i The breech hinge pl ate i s
stamed wth
t he
mdel of gun,
nam
of
mnufacturer
and
year
of
mnufacture
The
mzzl ef ace i s mrkedwth themdel of
gun, nam
of
mnu
facturer, and year of mnufacture Theweight of the coml ete gun
i s i ndi cat ed and i i t has been
r el i ned,
the year of
rel i ni ng
i s
mrked
The mzzl e f ace i s scoredwth w t ness ti nes
f or
use of themzzl ebore
si ght
duri ng
or i ent at i on of thegun
5
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Par
5
T I L
9 4 4
Gunand
Carri age
Fi gur e
C osedReady o F i re
R
PD39858
Figure
3
Cl oset
Posi t i on
C ose up o Segment
Gear
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11/140
TM9 4 4
Par
Gun
and
arri age
Figure
4
Segment
Gear Rot at i ng Cl ose up
PID
9959
RAPD
9856
Fi gur e 5
Tooth
an Operat i ng
Lever
Gear
Pushi ng
reechbl ock
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Pars 6-7 TM9-424
Gun and Car r i age
6
BREECH
MECHANSM
M 9
f i g s
2
and 3
a Thebreech mchani sm s of the l ever- pul l type w th a f our-
sector
i nt er r upt ed
par al l el threadbreechbl ock Whenthe breechbl ock
i s opened bythe operati ng l ever three operat i ons are
performd
1
The f i r s t
mvement
of
the
l ever
f i g
4
rotates
the
breech
bl ock unti l stopped
by the breechbl ock
stop
At the sam
ti m
the
f i r i ng mchani sms l i de i s movedaway fromthe f i r i ng l ever thus pre-
venti ng the guri
f rom
being f i r ed when the breech i s not l ocked
At
thi s
poi nt
the threadedsectors of thebreechbl ock ar e
disengaged
from
the
threaded
sectors i n the breech bushi ng
and
the
tr ans l at i ng
teeth
of the pi ni on start t o engage
the
t rans l at i ng teethonthegear
segmnt
f i g
12
2
Further
mvement
of the
l ever
draws
the breechbl ock
t o
the
rear unt i l the stop f l ange
str i kes the
bottom
of the
stop groove
i n the
carr i er f i g 5
As the breechbl ock reaches the
end of t r ans l at i on
t o
the rear the i nner end of the
l at c h bol t
sl i des down the
i ncl i ned
groove
on
thebreechbl ock
pal l et and
the
outer end of
the l atch bol t
i s
wth-
drawn
from
the
l atch
bol t
seat
f i g
13
3 Conti nui ng the pul l on the
l ever
draws the breechbl ock
car-
r i er
away from
the
gun f i g
14
and
as the
l at ch l ever
cl ears the
t r i ppi ng stud the l atch bol t
i s f orced by
the l atch
l ever
i nto the
wel l
i n the br eechbl ock l ocki ng the
breechbl ock
t o t he
carr i er
b To
Cl ose
the
Breech
1 Gaspthe handl e of the
l ever
and swng t o the l e f t and for-
ward as
f ar as
i t
w l l
go
whi ch
i s par al l el t o
the breech f ace
of
the
carr i er
2
The
f i r s t
mvement
swngs the
breechbl ock
carr i er
agai nst
the
f ace of the breech
3 As the
car r i er st r i kes
the f ace
of
the gun the
l atch
l ever i s
f or ced
i n
by the t r i ppi ng
st ud
whi ch draws the l at c h bol t out
of
the
wel l and
un ocksthe breechbl ock
from
the carr i er
4
Conti nued
mvement of the
l ever
t r ansl at es t he breechbl ock
forward
unt i l i t i s stopped by the breechbl ock stop The forward
mvemnt of thebreechbl ockcauses the i nc l i ned sur f ace of the breech-
bl ock pal l et t o f orce
the
l atch bol t
outward and i nto
the l atch
bol t
seat l ocki ng
the car r i er t o the f ace of the
gun
5
The
f i nal mvement of the l ever
forward rotates the
breechbl ock
unt i l
the
breechbl ock
stop l ocks
i t
i n
the
f i r i ng
pos i t i on
f i g
2
6 The
l ever mvement which opens or cl oses
the breech
i s one conti nuous mti on
7
OBTI LTRATI QN
a
Obturati on i s the seal i ng of the breech t o
prevent
the escape
of
comusti on
pressure
to
the
rear
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TM9-424 Par
Gun
andCarri age
REAR
SPLI T
R NG
FRONT
SPLI T RNG-- -- X=
GAS
CHECKPAD
FILLING
I N DSK
INNER
RNG
OSTURATORSPINDLE
NO
COMBUSTION
PRESSURE
SPACE
EXAGGERATED)
Fi gur e Qbturator i n
Normal Posi ti on
h When the breech i s
cl osed
the gas
check
padand steel s p l i t
r i ngs
enter the s l i g h t l y taperedgas
check
seat - i n
the
barrel f i g
When the gun i s f i r e d the obturator
spi ndl e i s
f or ced
back by
the
pressure
of
the expand ng
gases
thereby compressi ng the
gas
check
pad and expand ng the
spl i t
r i ngs
f ag 7 Thi s acti on
ef f ect i vel y
seal s
the
breech
Af ter f r i n g the
spl i t
ri ngs
and gas check pad
resume
thei r
ori gi nal
posi t i on and
the
breech may
be
opened A
smal l
spl i t r i ng i s al so used to seal the obturator spi ndl e hol e i n the
gas checkpad The
f i l l i ng- i n
di sk serves as
a
beari ngwasher to
e l i m
i nate
f r i c t i o n between
gas checkpadandbreechbl ock
Thi s
i s
neces-
9
RAPG
95214
-
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14/140
ar
OBTURATOR SPINDLE
MOVES
BACK UNDER
COMBUSTI ON
PRESSURE
COMBUSTI ON
PRESSURE
R NGS EXPAND
AT
SPLI T
N
PAD COMPRESSES
SEALI NG
SPACE
Gun
and
Car r i age
Fi gur e 7
Obt urat or
r
F ir ing
Posi ti on
sary as the
breechbl ock rotates
whi l e
the obturator spi ndl e whi ch i s
keyed t o the breechbl ock carr i er does not
c
entral
bore
i n
the
obturator
spi ndl e
form
a chamber f or
the pri mer and
a
vent f or the pri mer
f l ame
Threaded holes i n the
mushroomheadof the spi ndl e areused t o attach
pl ugs used i n pressure
testi ng
and
are
pl ugged w th
screws
t o prevent burn ng
the threads
when
pressure pl ugs are not used Holes are al so
provi ded i n the
head f o r
a
spanner
wrench
whi ch i s someti mes necessary
f or
the
removal of the obturator spi ndl e
1
TM9 424
R PD
95129
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15/140
TM9-424
Pars 7- -8
Gri n
and
arr i age
Fi gure
8
Fi r i ng
Ci rcui t Wri ng
Dagram
8
FIRNGMECHANSM
RECOL FIR NG
CONTACTORX
GROUNDON
GUN
PRMER
FUZE
CRCUTBREAKER
ON REE HX
RAPD95157
d
The spi ndl e f i g 20 has anannul ar
groove
wh chengages the
yoke of the f i r i ng mchani sm
o
hol d the l atter
i n
pl ace Sack of the
groove the spi ndl e i s threaded to take the spi ndl e nut wh ch hol ds
the spi ndl e bal l washer i n pl ace
a The
f i r i ng mchani sm f i g
22
f or theGunM 994
i s
i ntended
f or
use
wth
ei t her
el ectr i c or f r i c t i on pri mrs
I t
consi sts
of the
f o l -
l owng
parts
f i g
40 sl i de sl i de
cat ch
sl i de
housi ngyoke
pi n
ej ector
f i r i ng
l e a f ,
contact
c l i p ,
saf et y
bar
f i r i ng
cabl e ci rcui t
breaker
contact
ci rcui t breaker
housi ng and
ci rcui t
breaker housi ng bracket
b Thegun
cannot be
f i red unl ess
the breech
i s
f ul l y
cl osed and
l ocked
] . I t cannot
be f i redwth
the l anyard f or
as soonas
the
breech-
bl ock
starts t o r ot at e
i n cl osi ng
the
saf et y
bar
enters
the groove
i n
the
si de
of
the
f i r i ng l eaf
preventi ng mvemnt of the l eaf to the rear
2
I t
cannot be
f i red
el ectr i cal l y
because
the f i r ing
ci rcui t
i s not
coml etedunti l the
breech i s f ul l y cl osed and l ocked
3 The pri mr wh ch reseml es
a blank
r i f l e
cart ri dge
wth a
knob-ended wre protrud ng from
the base i s
i nser t ed
i nto primr
chamer
of the
obturator
spi ndl e
4
Wen
f i r i ng by
l anyard the f i r i ng l eaf i s pul l ed backand
pul l s
the wre of thepri mr rearward Th s act i on f i r e s the f r i c t i onpri mr
Wen
f i red
el ectr i cal l y the cl osi ng of thebreechcoml etes the circui t
andthepri mr mrel y awai ts
theel ectri cal i mul sefromhe
mgneto
c
Fi ri ng i rcui t Thegun i s
f i red
el ectr i cal l y by the
mgneto
wh chi s muntedon the t raversi ng handwheel bracket
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
16/140
Pars
9-10
Thk
9-424
Gun
and
Carri age
9 GENERAL
ec t i on
DESCRI PTI ON OF
CARRI AGE
a Emplacement
The
Barbette
Carri age
M 9
i s
i nstal l ed
i n
a
preparedconcr et e
emplacement
wth
a
rai sed
center ,
of
such
desi gn
as t o
permt
t he recoi l
mechani sm
o cl ear t he
emplacement
at extreme
el evat i on f i g 1)
b Pedestal
The
pedest al , whi ch i s t he
stati onary
foundati on f or
t he pi vot yoke
i s
bol ted t o theconcrete emplacement
Thet raversi ng
wormwheel
andazi mth ci rcl e
aremuntedon
i t f i g
1)
c
Pi vot
Yoke The
pi vot yoke whi ch supports the
cradl e i n i t s
trunni on beari ngs,
rests ona
rol l er thrust beari ng i n
the
cent er of the
pedest al
and i s
balanced
byabronzebushing
at
the top and bottom
of
the
pedest al
d
Recoi l
Mechani smand
Cradle
The
recoi l
mechani smand
cradl e
consi st of
the
f ol l ow ng
asseml i es
Thecradl e,
a l arge
casti ng
i n whi ch the
gun
sl i des f or recoi l
and
counterr ecoi l
the
cradl e t r un-
ni ons andbeari ngs f or
el evat i ng
or depr essi ng thegun the el evat i ng
rack f or the
cont r ol of
el evat i on
or
depressi on
; the recoi l
cyl i nder
f or
sl owng the
gun
t o a gradual
stop i n recoi l
and
counter r ecoi l
;
andthe
r ecuper ator
spr i ngs
f or slowng
the gun i n recoi l
and
returni ng
the
gun t o battery i n count er- r ecoi l
e
Elevati ngMechani sm El evati on or
depressi on i s bymnual ly
operated handwheel
f i g
9
The
el evat i ng mechani sm s munted
on the
l e f t s i de of the yoke The carr i age i s
el evat ed throughaworm
wormwheel
and
pi ni on gear operati ng
on
the
el evat i ng
rack,
whi ch
i s
munted on the cradl e to
el evat e
or depress the gun
The
true-
ni ons are
si t uat ed
at the
cent er
of
gravi t y
to
balancethe
gun
and so
el i mnate theneed f or abrake
f Traversi ng
Mechani sm The
car r i age i s
traversed
mnual ly
f i g
10 through a
worm
wormwheel
and pi ni on
gear
t o
the trav-
ersi ng wor rnwheel
on the
f ace
of
the pedestal
The t raversi ng
handwheel
i s
m. j nted
on
t he r i ght
s i de
of
the car ri age The car-
ri age may be traversed
conti nuousl y
through
360 degrees 6, 400
mls In
some
cases, stops are
employed on
i ndi vi dual
guns
af t er
emplacement
t o
l i m t
the
f i e l d of
f i r e
g
El ectri cal
System
The
el ect ri cal
system
consi st s
of
the
l i ght-
i ng
ci rcui t and the
f i r i n g
ci rcui t
10 PEDESTAL
a
The pedest al
f i g
1 i s
i n
the
general
f ormof
the l ower part
of
a cone,
termnati ng
wth
acyl i ndr i cal
upper
secti on
and
a f l anged
base,
whi ch
i s d r i l l e d f or
munti ng
bol t s
Four
covered mnholes
12
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TM9-424
Pars
10-12
Gunand
Ca
r r i age
are
provi ded f or
cl eani ng the
i nt eri or and
t o gi ve
access t o the 360
degree el ect ri cal contact - r i ng
The
j oi nts between manhol e covers
and
pedest al ar e kept water t i ght
by
means of gasket s
1 The extensi on
of
the cyl i ndri cal
part i s
f i ni shed to form
a
seat f or the t r aver si ng
wormwheel
2 An annul ar
boss
i n
the
bottom
of
the pedest al
form
a bear
i ng f or the l ower end of the pi vot yoke
The
upper
cyl i ndri cal part
of
the
pedest al ma nta ns the pi vot yoke i n a ver t i cal pos i t i on
3 Thewei ght of the revol vi ng par t s i s supportedby a pl ai n
rol l er
t hr ust
beari ng
between
the pi vot
yoke
andthe
annul ar bore
onthe
pedestal
base
11
PIVOT
YOKE
a The
pi vot yoke
has two vert i cal prongs whi ch
bear the t run
n on
beds f or
the
trunni on beari ngs
and
cradl e
The
shi el d suppor t s
are
f i t t ed
i nto f i ni shed recesses i n
the
outer f aces of the
prongs
These
supports
are
al so
bol ted t o
the
prongs
of
the
pi vot
yoke Annul ar
pr oj ecti ons onthe pi vot yoke
prevent
entryof water i nto
the
pedest al
bear i ngs
The
ends of the cored
hol e
i n the stern are cl osed wth
pl ugs
The
t r aver si ng gear caseand
the
platformbracket s are bol ted
to
theprongs Twooi l hol es
are provi dedi n thepi vot yoke
f or oi l i ng
the
upper pedest al
beari ng andan o i l pi pe l eads
from
a
t hi r d
hol e
to
the t hr ust beari ng at
the
l ower end of the pi vot
yoke
12 RE OL
ME H NSM ND
R DLE
a Crad e
The
cradl e i s
bored
to
r ecei ve
the gun O l
grooves
i n l i ners
connected
t o
si x
oi l hol es
i n
the cradl e andtwo i n
the
f r ont
l i ner
i nsur e
proper
l ubr i cat i on Near
the
f r ont
endar e
the
el evat i on
trunn ons
whi ch are
supported
i n
the pi vot yoke
On
the
top
of the
cradl e
i s
a
l i f t i ng
r i ng
The shoulder
guards and
el evat i ng
rack are
attached
t o the cradl e
Underneath
the
rear port i on
and
formng
part
of
the
cradl e are the
recoi l
cyl i nder
andtwo
recuperator spr i ng
cyl i nders
b
Recoi l
The
r ecoi l cyl i nder
holds
3 gal l ons of
oi l
t
has
a
l i ner cap whi ch i s screwed to
the
l i ner i n whi ch three
throt t l i ng
grooves
are
cut
The l i ner
and
l i ner
cap
ar e held i n pl ace
by
the
rear
cyl i nder head
count err ecoi l
buf f er i s provi ded
i n the f ront
end
o£
the
recoi l cyl i nder
The rear
end
of
the
cyl i nder
i s cl osed
wth
a head
i n whi ch
are f i l l i ng
and
dra n hol es f i gs
41
and44
cl osed
wth
screw
pl ugs
and
the
stuf f i ng
box
wth
i t s
gland
and
f ol l ower
The
pi ston
consi st s
of a
l i ner
screwedon the
f r ont end
of
the
pi ston r od
whi ch
i s attachedby
f r ont
and
r ear nut s t o the
recoi l
band
f i g
42
The
recuperator
spr i ng yoke i s carr i ed on the pi ston
rod
i n r ear of
the
r ecoi l band and i s
secured
between
rear
nut and
band
13
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18/140
Par
Gunand
Carri age
TM9 424
Fi gure 9
Range arumand
El evat i ng
Handwheel
M 9
RA
P[ 1
39896
e Recuperati on
The
recuperator spri ng cyl i nders
areprolonged
to
the rear by extensi ons
and i n each i s a spri ng rod the rear end
of
wh ch i s
attachedt o a yoke secured
i n the
rear
of the recoi l band
f i g 42 The
head of each spr i ng
rod rests
on
a
col umn of f our
spr i ngs wh ch
are
rested
i n
the
spr i ng
cyl i nder
The
. t wo
smal l er
ones
are
carr i ed
i n
a st i rrup
t hat
t el escopes
wthi n the ext eri or two Each
of
thetwo
spr i ngs
of
the
sam
d amter
i s
partedby
a
separat or
The
l ength of
the spri ng rod
shoud
be
adj usted
f i g
43
so as
to return
the gun i nto battery at
the maximum
angl e of
el evat i on
wthout
shock
but
i n no
case
shoudthe head
o the rodprotrude
f romthe
front
end
of the cyl i nder wh ch
i s open
d
Recoi l
andCounterrecoi l
System The acti on
of
t he gun
i s
as f o l l ows
Wen
f i red
thegunr ecoi l s t o
the rear about 5
i nches
i n
the cradl e
car r yi ng wth
i t the
recoi l pi ston and
recuperator
spr i ngs
rods ; t her eby
comressi ng the
recuperator
spr i ngs
mal l port i on
of
the
energy
of
the
recoi l
i s
absorbed
i n
comressi ng the
spr i ngs
but the
greater port i on
i s absorbedby the
resi stance
wh ch
the
l i qu i d
offers
to bei ng f orced
through the openngs
formd bythe
thrott l i ng
grooves
Thedepths of the
grooves are
proporti oned so that
the
areas of the
openi ngs vary ng wth the
posi t i on
of
the pi ston duri ng
recoi l
w l l be such
as
to produce
a constant
resi stance
assi sted by
the recuperator
spr i ngs throughout
the l engthof
recoi l The
counter
14
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19/140
TM
9 4 4
Pars 12-13
Gun
and
Car r i age
Fi gure
10
Traversi ng
Wrm
Housi ng
M
900
recoi l
buf f er
or plunger
i s
tapered t o provide resi stance to control
the
moti on
of the gun duri ng
i t s
return t o battery and f i nal l y bri ng
i t
t o
rest when
the
pi ston
reaches the
f ront
end of the
cyl i nder
13
ELEV TING
MECH NSM NDR NGE RUM i g
9
a El evati ng Mechani sm
n el evat i ng
br acket
bol t ed
t o
the
l e f t
pl atform
br acket cont ai ns the el evat i ng
gear
Bymeans
of
the
el evat i ng
handwheel
movement
i s
commun cated
t o the
cradl e
through
act i on of
the
pi ni on
on the el evat i ng
rack The
el evat i ng
wormwheel
i s
assembled
between two other di sks
whi ch
bear on
i t s
si des
i n such a
manner t hat
the pressure between the
wheel
and
di sks
my
be vari ed by
means
of
a
nut on the outer end of the
el evat i ng pi ni on
shaf t
Thi s nut shou d be
ti ghtened suff i c ient l y t o
provide
enough f r i c t i o n to enabl e the gun t o be el evated
and yet
permt sl i ppage
bef ore any
i nj ur i ous
s t rai n i s brought uponthe
el evat -
i ng
wormwheel
and
worm
Nne hundred
pounds
appl i ed
at
the
muzzl e shou d
s l i p the f r i c t i on
b Range
Dumf i g
9
The range drummechani sm
rack i s
bol ted t o the upper end of
the el evat i ng rack and meshes wth the
pi ni on Moti on of
the pi ni on rotates the drum t o the
out er cyl i n-
dri cal sur f ace of
whi ch
the
graduati on r i ng i s attached
pri ng
I s
R
PD39900
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
20/140
Pars
13-14
Gunand
Carri age
14 TR VERSING
ME H NSM
T L
9-424
keeps
the f ace
of the pi ni on teeth i n
contact wth those on the
rack,
thus el i mnat i ng backl ash
1 The i nner edge
of
the
r i ng i s
graduated
i n
yards
f or sub
cal i ber range,
the outer edge i n yards f or servi ce
r ange, and
between
these
two
scal es the
r i ng
i s graduated
i n degrees of
el evat i on
The
degree
marks
on
the
el evati ng
scal es
are
determned
by
the use
of
a
cl i nometer
supported
by a
zest
pl aced i n the
mzzl e of the gun
af ter gun
i s
mounted
upon
the
car r i age
NOTE Somerange
drum
have
beenmod f i ed
so that cal i brat i on i s i n ml s
Wenso graduated
hei ght of s i te
does
not af f ect
scal e
2 As the ranges correspond ng
t o
di f f erent
angl es of el evati on
above the hori zont al
depend
upon the
height at whi ch the gun
i s
mounted above
sea
l evel ,
the
range
scal e
mst
be graduated
af ter
mounti ng Thi s shoul d never
be
done
except ti nder the super vi si on
of t he
Ordnance
Departmnt
3 range poi nter
i s
attached t o therange drumbracket and
a shoul der
guard
i s
attached to
the
cradl e
and
spr i ng cyl i nder
head
a The tr aversi ng mchani sm s
l ocat ed on the
ri ght
si de of the
pedestal
Si x
oi l hol es
are
provided
f or
o i l i ng the beari ng of
the
t raversi ng
wormwheel through
the top
of the pedestal The travers-
i ngwormwheel
i s
encl osed
i n a two part gear
case
andbol ted t o the
pi vot
yoke
f i g 10
b Beneath the wormwheel i s the
f r i c t i o n band
The
f r i c t i o n
be
tween
the
f r i c t i on
band
and
wormwheel i s ad usted t o enabl e
the
gun
t o be traversedwthout sl i ppi ng
and
yet permt sl i ppi ng i n case
undue
strai n
i s
brought
on
the
teeth
of
the
wormwheel
c
The
tr aver si ng
wormshaf t i s asseml ed
wth
i t s worm n the
t raversi ng
gear case
i n f ront of the pedest al f i g 10 At both si des
of the worm t i s
supported i n bear i ngs
f ormd
by the tr aver si ng
gear case and cover Two
bal l
thrust beari ngs, encased
i n
col l ars,
bear on ei ther
si de
of the tr aversi ng wormand transmt the thrust
to the worm
casti ng
Concave and convex washers are provi ded
between
t hewormcasi ng and the
bal l
beari ng
t o equal i ze the thrust
Between
the
bal l
beari ng thrust col l ar and the tr aver si ng
worm
shaf t
i s a
spl i t col l ar and
a
spl i t
thrust col l ar
nut
ny
excessi ve
end
pl ay
maybe takenup
by
the thrust col l ar nuts
Theazimth
c i r c l e
i s
bol ted to the
base of
the pedestal
wth the
ver ni er
and poi nt er
attached t o
and
tr aversi ng
wth the pi vot yoke f i g 11
d
Near
i t s rear end,
the t raversi ng shaf t
i s supportedby abeari ng
attached
t o
the
shoul der rest
Onthe
rear
end
of thi s
shaf t
i s
the
tr aversi ng handwheel
e
Wennecessary
to control
amount of
traverse
f or
any
part i c-
ul ar eml acemnt,
traverse stops bol ted t o
the pedest al
l i m t
the
16
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21/140
TM
9-424
P
a r s
4 15
Gun
andCarri age
Figure
T
Traversi ng Verni er
M
900
RA
P ] 39899
t raverse
r i ght
or
l e f t
by
cont act i ng the stop armbol t ed to the l ower
s i de of the l t
pl atformbracket
f Shoulder guards arebol ted
t o cradl e and
spr i ng
cyl i nder
heads
on
each
s i de of the
gun
t o
pr otect gunners
f rom
nj ur y dur i ng r ecoi l
and
count er r ecoi l
g
houlder
rest
i s attached
to
the pl atformbracket
on
the
r i ght ( t r aver s i ng) s i de of
the
gun
15 LGHTNG
SYST M
a Thecurrent f or l i ghti ng
i s
obtained fromt he empacemnt
mins
through
a
leaded and
armred twn
conductor cable
whi ch
ent er s
through the bottom
of
the pedes t al
Contact cl i ps
connected
t o
the
two
wres transmt
the current
to
two
cont act r i ngs attached
t o
the pi vot
yoke
thus permt ti ng
themunt
to be
t raversed
360
de
grees
From
hese
r i ngs
t he
power
i s
di st r i buted
t o
8- candl e
power
l amps
one at
the
azimth i ndex and the other
at
the
range scal e
and
t o
2 candl e
power
l ams on thet el escopi c
si ght, one
t o
i l l umnate
the
cross
wres and
one
to
i l lumnate the def l ecti on scal e
there
i s
al so
an engi neer s
pl ug
box
do
t he
t op
of
the
l e f t pl at f or m
br acket
f or
a
portable
lamp
A l lamps
are
11
. 0
vol ts
or
22
vol ts
depending
onthe
voltage of the
empacemnt
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
22/140
Pars
15-19 TM9-424
Gun
andCarri age
b
The
current
t o the 8 candl e
power
l amps
i s
contr ol l ed
by
124-ohm
r esi st ance
tubes
f or
11 1-vol t ci rcui ts and by 269-ohmre-
si st ance
tubes
f or the
220- vol t ci rcui ts
the
current
t o the
2- candl e
power l amps by 410-ohmresi st ance tubes
f or
the
110- vol t
ci rcui ts
and
by
889-ohmr esi st ance tubes f or the
224- vol t
ci rcui ts
e
The
azi mth
and
el evat i on
l amps
are
contr ol l ed
by
the
water
t i ght
sw t ch l ocat ed
on the
out si de
of the
l e f t
pl atformbracket
The
si ght
l i ght
cabl es are spl i ced t o the end of
a three-conductor cabl e
at
the
other endof whi ch i s ar ecept acl e pl ug to f i t i nto a
wat er t i ght
r ecept acl e pl ug box
The t el escope
i s
provi ded
w th a mechan cal
di mmer
bywhi ch any
desi r ed i l l umnat i on of the cross
w res maybe
obtai ned
16
SHELD
N
SUPPORTS
a
The
cyl i ndr i cal shi el d of the
4
/ 2-i nch
armor pl ate i s mounted
wth i t s
axi s
i ncl i ned 40
degrees to the
hor i zont al i n
order
to provi de
def l ecti ng
sur f ace to enemy
f i r e
I t
weighs
10 418
pounds
and
i s
pi ercedwthagunport and
two
si ghti ng
hol es
The
si ghti ng hol e on
the
l e f t si de
was
used
when
the
mount
was equi pped
wth
a t el escopi c
si ght
on
each si de
Thel e f t
si ght
has
been
d scarded
The
shi el d
i s
attached t o the
si des
of thepi vot yokeby
two
supports
17 GUNNERS PL TFORMS
a Pl atform f or the gunpoi nter and
setter
are
mounted on
each
s i de of
the gun
18 LO DNGTR Y
a I n cases when hand l oadi ng i s
undesi r abl e the l oadi ng tray i s
used
ec t i on
OPERATION
19
PREP R TI ONFOR
FIRNG
a
Bore
Cl eani ng and
Inspecti on Remve t he breech and
muzzl ecovers
i nspect
bore
andchamber
t o
be
sure
no f orei gn mate-
r i a l
has accumul ated
I f di rt y
cl ean wth
dr y- cl eani ng
sol vent
and
wpe
dry
Normal l y, the bore and chamber should be
wped dry
or
cl eaned
t o
remove
the
coati ng
of
oi l
appl i ed
after
the previ ous
f i r i ng
b
Breech
and
Fi ri ngMechani smnspect i on
Open
and cl ose
the breech and
noteacti on I f
operati on
i s
s l uggi sh or
s t i f f determne
cause
and correct
condi t i on
par 29 Wth
the breech
cl osed pul l
dowy the
f i r i ng
s l i de
l atch
bol t
and move the
s l i de t o be sure i t
-
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23/140
TM9-424
Par 19
Gan
and
Carri age
19
RA PD
39 64
Fi gur e 12 Operati ng Lever Pul l ed To Turn Breechbl ock
operates f reel y Thebreechbl ock andbreech r ing threads
shoul d
be
cl ean
Wpe
the gas check pad, cl ean and appl y a t h i n f i l m of
i l
as pr escr i bed by
W O
-424
r Ul ectr i cal Contact Check Before f i r i n g
check
completeness
of the f i r i n g
ci rcui t
The cir cui t mybe
tested
wth
a test l amp or
by f i r i n g a pri mer par
49)
d
mmn tion
Preparati on
1)
Pr o j ec t i l es t o
be
f i red
shoul dbe prepared beforehand
par
65)
and
pl aced
i n
racks provided
2) Veri fy t ype
wei ght
and
l ot
number
of
pro jec t i l e
3) Remverope grommet
and
i nspect
ro ta t i ng
band Remove
any
burs wth f i l e
4) Wpe pro jec t i l e wth cl ean dry wpi ng c l oths
I t
i s i m
portant
that
proj ect i l es be
perf ect l y
cl ean and
free
of sand and
di rt
5)
Pro j ect i l es
equi ppedwth
base detonat i ng
f uzes w l l normal l y
be recei ved fuzed
f or
f i r i n g
Pro j ect i l es
equi pped
wth
poi nt det o
nati ng f uzes w l l
be
normal l y recei ved unfuzedandw l l be
fuzed
as
requi red
i n
the
. f o l l o w n g
manner
:
a) Remvethe eyebol t l i f t i ng pl ug f romthe
pro jec t i l e Do not
remove eyebol t
unt i l
fuze i s t o be
i ns tal l ed Theeyebol t pl ug i s
pro
vi ded
as a l i f t i ng devi ce andal so as a
pl ug
to
keep out f orei gnmatter
b) I nspect f uze
cavi t y andthreads
They
shoul d be
f reed of any
f orei gn
matter that
coul d
i nterf ere wth the
proper
assembl y of
the
fuze
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24/140
Par
19
TM9-424
Gun
and Car r i age
RA
PD
39861
Fi gur e 13
Operati ng
Lever Tr ansl at i ng
Breechbl ock
c
I nsert the f uze, bei ng car ef ul that
i s
i s
f i t ted w th
i t s
f e l t
or
rubber washer, and screw
i t
i n by hand
d) Screwup the
f uze
wth the fuze wench, but wthout usi ng
force
e)
I f there any di f f i cul t y i n screwng i n the
f uze, i t
shou d
be
remved
and
another
one
i nser t ed
I f
the
sam
troubl e
i s
ex-
peri enced w t h a second f uze, the
shel l shou d
be rej ected
f
Set
f uze
t o
DELAY
or
SQ superqu ck) as
di rect ed
and
descri bed i n
paragraph
66
g)
For f urt her
i nformti onand
i nstr ucti ons
on
ammun ti on,
see
chapter 4
f i
Al l
powder
char ges,
except
the charge f or the next succeed-
i ng round,
wi l l
be kept
i n
thei r
cont ai ners The
powder
charge f or
any
round w l l
not be
brought i nto the gun eml acemnt
unti l
the
precedi ng
round
has been
f i r e d I nstr ucti ons f or
remval of charges
f rom
cont ai ners
and
preparati ons
f or
f i r i ng
are
gi ven
i n
paragraph 65
7) Previ ous t o
f i r i n g ,
each of
the
pri mrs t o be used
i s
t o
be
i nsert ed i n the obturator spi ndl e to
test each
pri mr
f or proper f i t
e
Recoi l
O l
Checki ng Depress
the gun, t o
zero
degree
0
. 4
m l , remve recoi l
cyl i nder
f i l l i ng
pl ug
f i g 44 , and note
i f
the
cyl i nder
i s
coml etel y
f i l l ed
20
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25/140
TM9-424
Pars
20-22
Gun and
Carr i age
RAPD39852
Fi gur e
14 greechbl oek
Stort i ng
To Swng on Carr i er
24
TOTR VERSE
a
The
munt
i s traversed
by
turni ng
thehandwheel of
the
mch-
ani sm
on
the
r i ght s i de
Wen t r acki ng, the
gun
poi nt er
wi l l
mtch
the azimuth readi ng f i g 11
wth pl ot t i ng room
suppl i ed data
For
operati on
of
s i ght i ng and
f i r
control
equi pmnt
refer
t o
chapter 3
21
TOELEV TEOR
DEPRESS
GUN
a The
gun i s el evated or
depressed
mnual l y
by
t ur ni ng
the
handwheel
on the l f t si de,
and i s
di r ected fromthe
pl ot t i ng room
t o
the setter by tel ephone
Ater f i r ing,
the
gun
i s
returned
t o
177
. 8 -m l 1f }-degr ee el evat i on, the l oadi ng
pos i t i on
22
TOLO D
a
Spent
Primr Ej ecti on Af t er around
has been
f i red,
wth the
breech
coml etel y cl osed,
r a i se the s l i de catch
by
pr essi ng upward
on
the handl e
of
the catch f i g 15 This mvemnt
of
the s l i de
wi l l
ej ect
the
f i r e d
primr
b
Breech
Openi ng Gaspthe breech operati ng l ever
and pul l
i t
out of l at ch
Pul l
l ever
to
rotate breechbl ock f i g 12
and
con
ti nue themti onto
swng
the
bl ock cl ear of
thegun
f igs
13
and 14
Hol d the breechopen
t o
the f u l l
ext ent t o
prevent
i nt er f er ence wth
the operati on
of
l oading
21
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26/140
Par
22 TM
9-424
GunandCarri age
R
P1
39864
Fi gure 75
Openng
Fi r i ng Mechan smSl i de
To
Remove Pri mr
e
Proj ect i l e
Rammng The
proj ecti l e
brought up
t o the
gun
and
pl aced
i n the chamber
cl ear of
breech
sectors
hand
l oadi ng or
on
the l oadi ng
tray
wth
the rarnmr
head
at
the base of the
pro
j ec t i l e The rammer
then dri ven smrtl y
forward
to
seat
pro
j ec t i l e
securel y
i n the f orci ng cone
d
Powder
Charge I nserti on As the
proj ecti l e
bei ng
rammd
home
the
prepared powder
charge
brought up pl aced
wth
the
i gni ter
pad
dyed
red
to
the
rear
and
pushed
hom
i nto
the
chamber
e Breech
C osing
Cl ose breech by means of operati ng l ever
reversi ng the
operati on
descri bed
i n
subparagraph b above Make
cert ai n
the
l ever
i s
l at ched
i n
posi t i on
Primer
I nserti on
Af ter ej ecti on
of
pr i mer
cl ean
vent and
seat
wth
primr seat cl eani ng brush i nsert newpri mer and
drop
s l i de down
f ar
enough
to permt
s l i de catch
to engage the
notch
i n
thehousing Thebreech then
openedand
the
obturator spi ndl e
mushroomhead
swabbed
wth
wpi ng
cl oth dampenedwth
cl ean
water
-
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27/140
TM9-424 Pars
2
3-24
Gun
and Carri age
23 TOFIRE
24
TO
UNLO
Fi gur e 6 Tr aver si ng
Mechani sm
a
El ectr i cal
Fi ri ng
The
gun
wi l l be f i r ed el ectr i cal l y by operat -
i ng the magneto l ever except i n the case of power
f ai l ure or a
broken
f i r i ng cir cui t
b
Manual Fi ri ng
To
f i r e manual ly,
usi ng f r i c t ion pri mer a l an-
yard i s
attached
to
the
l anyard l oop
on the f i r i ng
l ever
and the
l anyard pul l ed wth a qui ck strong
pul l
not
a
j erk
c
M s f i r e
I n t he
event of a m s f i r e
f ol l ow the
procedure
pre-
scri bed
i n paragraph
29 a
observi ng
the f ol l owi ng
precaut i ons
1
Keepthe
gun
poi nted at the
t ar get
or
i n a
cl ear
f i el d of
f i r e
2 Al l personnel must keep
cl ear
of the l i ne of f i r e
and
the
path recoi l
at
a l l
ti ms
duri ng
ms f i r e
procedures
3
L l s e
the
butt erf l y
net i mprovi sed when removi ng
the
pri mr f romthe
f i r i ng
mchani sm
a
Servi ce Rounds No unloadi ng devi ce i s provi ded wth th is
materi el f or use i n unloadi ng
servi ce
rounds of
ammuni ti on When i t
i s desi red to unloadthe pi ece the proj ect i l e
may
be
f i r ed
out of
the
gun
af ter
i t has been determned that the f i el d of
f i r e i s
cl ear
proj ect i l e canbe removed
by applyi ng an i mprovi sedunloadi ng head
23
TRAVERSI NGH N WHEEL
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28/140
Pars
24-27
TM
9-424
Gunand
Carri age
t o the
ogi ve of the proj ect i l e
The
head
however, must have an
out-
si de
d ameter
of 5
/ s
to 5
3
/ 4
i nches
and a
central
open ng
at
l east
334
i nches
i n
d ameter and
6
i nches
l ong
to
cl ear the poi nt - det onat i ng
f uze
b
DummAmmuni t i on The dumm
proj ect i l e
my be ex-
tracted
by
i nsert i ng
the
hand
extractor
through the
hol e
i n
the
base
of
the
proj ect i l e
and pul l i ng i t
back
qui ckl y t o r el ease theband
from
the chamber
f orc i ng
cone
Push proj ect i l e forward
and repeat i f
necessary
Wthdrawproj ect i l e
from
gun
25
AFTERFIRNG
a Cl ean and o i l bore and breech
mechani smas descri bed i n
paragraph 35
b
C eanand l ubr i cat e
al l t ool s and accessori es used i n f i r i ng
c
Repl ace
covers
f or
di rect f i r e
si ght s gun
muzzl e,
and breech
d
Return unused
powder
charges t o
ori gi nal cont ai ners and
wrappi ngs
Mark cont ai ners
so
t hat opened
charges mybe used
f i r s t at the next
f i r i ng
of the
gun
e
I f
the gun
i s acti ve
proj ec t i l es
myremai n
fuzed
I f
i nacti ve
f uzes
shoul d be
removed and returned to ori gi nal boxes and
l i f t i ng
eye pl ugs shoul d be
repl aced
i n proj ect i l es
26 LUBRCATIONORDER
Secti on
I V
LUBRCATION
a
Reproducti onof War Department Lubri cati on
Order LO9-424
f i g
17)
prescri bes
f i r s t andsecond
echel on l ubr i cat i on
maintenance
b
The poi nt s
of
appl i cat i on
l ocat ed on
the
Lubri cati on Order
are i l l ust rated
i n f i gur es 18
and
19
They mybe
i dent i f i ed
by the
numbers around
the
border
of the
War Department Lubri cati on
Order
e
War
Department
Lubri cati onOrder
i s pl acedon or i s i ssued
wtheach i tem
o
mater i el
andi s t o
remai n
wth i t at
al l ti mes
I n
the
event themater i el i s recei ved
wthout
a
War
Department
Lubri cati on
Order a repl acement
w l l be requi si t i oned
i mmed atel y
i n conform
ance wth
i nstr ucti ons and l i s t s i n
M
1-6
27
GENERAL LUBRCATION
SERVCNG
INSTRUCTIONS
a
Lubri cants
arepr escri bed i n the
KEY
i n accordance
wth
three
temperaturesr anges
above 32
° F
from
+32 Ft o 0° F and be
24
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29/140
TAN
9-424 Par
27
Gunand
Carri age
l ow
l ° F
The
ti me
t o change
t o
l ubri cant s pr escr i bed
f or
a
di f f erent
temperaturerange
i s
determned
by
mai ntai n ng
a
cl ose checkon
oper a
t i o n
of
themat eri el
duri ng t he approach
t o
prolongedperi ods
when
tem
peratures wi l l be
consi st ent l y
hi gher or
tower Because of
the
ti me
element
i nvol ved
i n
prepari ng
f or
operati on
at
l ower
prevai l i ng
tem
per at ures a
change
t o
l ubri cant s prescri bed
f or a l ower rangewi l l be
undertaken themoment operati on becomes
sl uggi sh
Ordi nar i l y i t
wi l l be
necessary
to
change
l ubri cant s only
when
expected atmos-
pheri c
temperatures are consi st ent l y i n
a h gher or
l ower range
b I nt erval s
speci f i ed on the
Lubri cati on Order are
mnimum
mai ntenance to be performed
by
the usi ng organi zat i on
I nt erval s
may be
reduced
under such
condi t i ons
as
excessi vel y
hi gh ambient
temperatures,
extreme
humd ty,
and
dustyat mospheres
duri ng per i ods
of
prolonged
f i r i ng or
operati on
ny
one
of
these
condi t i ons may
qui ckl y destroy
the
prot ecti ve
qual i t i es
of
the
l ubri cant s
and requi re
more
f requent
servi ci ng
i n
order
t o
prevent mal functi on ng
or dam
age to the
mat eri el Lubri cate mat eri el i mmedi atel y f o l l owi ng
ex
posure t o extrememoi sture
e
Lubri cati onEqui pment
1 Clean l ubr i cat i ng
equi pment
both before
and
af t er use
Operate l ubr i cat i ng
guns
caref ul l y
and
i n such
manner
as
t o
i nsure
a
proper di st r i but i on of
the
l ubr i cant
I f l ubr i cat i ng
f i t t i n g val ves
s t i ck
and prevent
the entrance of the
l ubri cant
remove the f i t t i ng
and
determne the cause Replace broken
or
damaged l ubri cat ors
I f
a
l ubr i cat or cannot be repl aced
i mmed ate y,
cover hol e wth tape
as
a temporary exped ent
t o
prevent
the
entrance
of
di rt
I f oi l l i nes
become
cl ogged
d sassemble
t he
l i ne
andremove
the
obst ruct i on
2 Lubri cati ng f i t t i n g s ,
grease cups oi l cups
oi l hol es
and
i l l
l evel
and
drai n
pl ugs unl ess
otherwse speci f i cal l y
aut hor i zed
are
ci rc l ed
i n
red f or ready
i dent i f i cat i on
3
Wpe
l ubr i cat ors
andsurround ng
sur f ace cl ean
bef or e
appl y
i ng
l ubr i cant Where rel i ef val ves
are
: pr ovi ded
appl y
new l ubri
cant unt i l theold l ubr i cant i s f orced
from
thevent
Excepti ons
are
speci f i ed i n notes
or on the
Lubri cati on
Order
Metal surfaces
on
wh cha
f i l m o f l ubr i cant
must be maintai ned
by manual
appl i cat i on
wi l l always be
wped cl ean
before
the
f i l m
i s
renewed
d
Cleani ng
1 Unless otherwse speci f i ed
use
r i f l e bore cl eaner
or
dr y cl ean
i ng
sol vent to cl ean or
wash al l
metal parts
of
thegun
and carri age
whenever par t i al or
to ta l
d sassembly i s undertaken or
when
renewng
the pro tect i ve l ubr i cant
f i l m
on exposed metal
surf aces
Use of
gasol i ne
f or t h i s
purpose i s
prohi bi ted yal l
par t s
thorough y
be
f or e l ubr i cat i ng Flushng
of
gear cases
or beari ng
housi ngs unl ess
the
i ncl osed mechani sm
s f i r s t
di sassembled i s not authori zed
25
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30/140
Par
27
TM4-424
Gunand
Carri age
oz
a_
s
2
6
o o
v o a o o o
N
Fi gure
17
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mn
e
m
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X
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r T
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T
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t
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31/140
TM
9-424
Lubri cat i on
Order
en
m
Gunand
Carr i age'
27
Par
.
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49
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
32/140
Par
GunandCarri age
i gure 8 Lubri cati on oi nts
28
TM
9 424
RA
PD95 65
-
8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
33/140
T 9 424
unand Carri age
Pi gure
Lubri cat i on
Poi nt s
29
Par 27
AA PD
95 66
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
34/140
Pa r s
27-29
TM
9-424
GunandCarri age
2
Care must
be takenwhen cl eani ng
oi l and
grease compart-
ment s t o i nsure t he compl ete
removal
of al l resi due
or sediment
D rt or other f orei gn matter
shoul d not be
al l owed
t o drop i nto any
of the
l ubri cant
reservoi rs
28
LU RC TED
Y
HGHERECHELON
a Cradl e trunn on
bear i ngs par
38a
h
Cradl e l i ner
par
37
a 4 }
e Pivot
yoke
thrust beari ngand
bush ng
par
38d
Secti on V
M LFUNCTIONS
ND
CORRECTONS
29
GUN ND
REECHMECH NSM
a Msf i re
1 I f i t i s uncertai n
whether
primer has f i red,
ej ect
the
primer
af ter
two attempts t o f i r e wth the magneto,
usi ng the butt er f l y net
t o catch theprimer
Examne
theprimer
a I f examnati on shows
that
the primer has not f i red, ei t her
the primer
was def ecti ve or the el ectri c f i r ing ci rcui t was
broken
Proceed
as i n step 2 , bel ow
b I f examnati onshows
that theprimer has
f i r e d ei t her a
hang
f i r e has occurred or the charge has fa i led
t o
i gni te
Proceed
as i n
step
3 , bel ow
2
PRMER
I s
NOT
HE RD
To
FIRE
Make
two
attempts
to
f i r e the primer Remove pri mer , i nsert
new pr i mer , and f i r e
a
I f newprimer f i r e s then
preced ng
primer was defecti ve
b I f newpri mer f a i l s
to f i r e
i t
i ndi cat es
that
themagneto f i r i ng
ci rcui t i s def ecti ve Check
the
f i r i ng
circuit,
t i ghteni ng
connecti ons
or contacts, and r epl aci ng
brokenwres I f
primer s t i l l
does
not f i r e
use f r i c t i on primer and
not i f y
ordnance
maintenance
personnel
3 PRMER
I s
HE RD
To
FIRE
As a
precauti on
agai nst the
dangerous
possi bi l i t y of
a
hangf i re,
keep
the
pi ece
pointed
at the
target or i n
a
cl ear
f i el d of f i r e f or amni mumof
64
seconds
before
removi ng
primer
C ean out pri mer
vent ,
i nsert
new
pri mer, and
attempt
to
f i r e
I f the primer
i s
agai n
heard
to
f i r e
wai t
at
l east
64
seconds,
then
remove
expended pri mer , open breech, wthdraw
unexpl oded charge,
and
examne
Fai l u re
of
the
propel l i ng
charge
i ndi cat es
anabnormal
condi ti on
a I f
the
i gni ter
end of
the
charge was agai nst the proj ecti l e,
i f the
i gni ter
chargewas fol ded over andnot
accessi bl e
t o
the primer
f l ame, or
i f
the
i gni ter
protector
cap
i s s t i l l i n pl ace,
make
the cor-
rect i on
and
rei nsert
30
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
35/140
TM9-424 gars 29-30
Gri nandCarri age
b the i gni ter i s mssing or wet or i no obvi ous reason f or
f ai l ur e
i s
seen
r epl ace
the charge
i n
the ori gi nal
cont ai ner
and
wrap-
pi ng
Mark
cont ai ner
f or fu ture examnati on
and
report andremove
t o saf e pl ace pend ng examnati on
check
pad seat
maintenance
personnel
c Breechbl ock Di f f i cul t
To
Open
After Fi ri ng
1
Gas check
pad stuck i n 1 Remove, wpe
cl ean
seat
and
appl y a f i l m of oi l Wpe
of f
excess
2
Broken
l oadi ng
tray
i n 2 Remove tray and re
t e r f e r i ng
wth
breechbl ock turn t o
ordnance
mai ntenance
personnel
f or r epai r
Load
by
hand
d Fai l ure of Breech
Mechani sm
ToOperate Freel y
1 Lack of l ubr i cat i on
Bur- 1
Dsassembl e
breech
red dented, or scored part s mechan sm cl ean and rel ubr i
cat e par
3S Report dam
aged breechbl ock threads
or
other damaged
parts t o
ord-
nance
maintenance personnel
e Ri f ti ng
of
GunBore
Rustedor Corroded
1
Bore
i mproperl y
cl eaned 1
Cean and o i l bore
as
and
oi l ed Powder foul i ng or out l i ned i n paragraph35
b
moi sture
cor rosi on
30 RECOL
MECH NSM
a
Gun
Recoi l s
Wth Shock
1 roken recuperator 1 Report
to
ordnance
spr i ngs
maintenance personnel
2 Voi d i n
recoi l cyl i nder
2
Ref i l l
cyl i nder
wth oi l
par 37
b GunReturns t o
BatteryWth
Shock
1 Voi d i n
recoi l cyl i nder
1
Ref i l l
cyl i nder
w t h
oi l
par
37
s z
h
Gas
Leakages
cause Correcti on
1
Brui ses on
gas
check
pad 1 Replace
or
torn
coveri ngs
2
Burred or
broken
spl i t
2
Replace
r i ngs
3 Dented
or
scored gas 3 Report to
ordnance
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
36/140
Pars
30- - 31
TM9-424
GunandCarri age
Cause
Corr ecti on
2 Recoi l cyl i nder pi ston
rod 2
Repor t to
ordnance
i mproperl y
ad usted
mai ntenance
personnel
3 Pi ston rod
st r i ki ng
cyl - 3
Repor t to
ordnance
i nder
head
i nst ead
of
gun
rest i ng
mai ntenance
per sonnel
on stop
c
Recoi l andCounterrecoi l Sl ow
1 Recoi l sl i des i n
cradl e
1 Rel ubri cate
i mproperl y
l ubr i cat ed
2
Recoi l
s l i de
sur f ace of 2
Cl eanand
coat
gunbar
gun bar r el not properl y l ubr i - r ef wth l ubr i cant
cated
3 Recoi l o i l col dand th i ck- 3 Recoi l speed w l l
be
ened sat i s f actory af ter f i r i ng one or
two
rounds
4 Presence of rust on r e- 4 Remove rust and co r ro
coi l s l i de
s i on
from
r ecoi l sl i de wth
cro-
cus
c l o t h
S St i cky
packi ngs
S
Report to ordnance
mai ntenance
personnel
31 ELEVATING
MECHANSM
a Ef fort
To
El evate
GunUneven
1
El evati ng rack on
cr adl e
1 Repor t
t
o ordnance
out of al i nement
mai ntenance
personnel
2
D r t
between
rack
and
el -
2
Cl ean
rack
and
gear
and
evati ng pi ni on gear
r el ubr i cat e
3 I ce or
forei gn
materi al
i n
3
Report
to ordnance
gear housi ngs
mai ntenance personnel f or
r e-
moval and
r el ubr i cat i on
of l
evati ng
mechani sm
4
Crad e trunn on bear i ngs 4
Lubri cate
bear i ngs sec
not properl y
l ubr i cat ed
I V
S
Trunni on
beari ngs rusted S
Report to
ordnance
or damaged
maintenance
personnel
h
Backl ash
i n Handwheel
1
Wear
of gear s
worm
and
1 Report
to
ordnance
wormwheel
mai ntenance
personnel
2
El evati ng rack
out of
2 Report to ordnance
al i nement
mai ntenance
personnel
3 El evati ng rack and
pi n-
3
Report
t o
ordnance
i on i mproperl y mated
mai ntenance
personnel
32
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8/16/2019 TM9-424 6Inch Gun M1900 Barbette M1900
37/140
TM9-424 Pars 32-33
GunandCarri age
32 TR VERSING
ME H NSM
a Baekl ash i n Handwheel
ause
Carreoi an
1
War of
worm
and
worm
1
Report
to
ordnance
wheel mintenance personnel
2 War
of
tr aversi ng
rack
2
Report to
ordnance
and
pi ni on
gear
mintenance
personnel
b Handwheel Ef fo r t
Excessi vel y
H gh
1 Di r t
rust
or gummed
oi l
1 Removemnhol epl ates
on
pi vot
yoke and pedest al
rol l er
i n
pedest al
Cean
bear i ngs
and
thrust beari ng rel ubr i cate
2 D rt
on
tr aversi ng
worm
2
C ean
and rel ubri cate
wheel
3
Lubricating
oi l
i n
worm 3
Change
l ubr i cant
sec
and
wormwheel
case thickened
by I V
l owtemperature
4
Wrm
st i cki ng
i n
case 4 Report to ordnance
mintenance