Allison-AT-MT-HT-Transmission-Electronic-Controls-Operators-Manual.pdf

OM1957EN

MT4108EN

Operators ManualMT(B), HT(B), CT SeriesOn-Highway TransmissionsElectronic Controls

OM1957EN

September 1995Rev. 1 19991028

OperatorsManual

Allison Transmission

MT, MTB 648HT 746, HT, HTB 741, 748HT, HTB 755CR, CLT, CLBT 755HT, HTB 755DR; HT, HTB 755DR DBCLT, CLBT 755

Printed in U.S.A Copyright 2007 Allison Transmission, Inc.

Allison Transmission, Inc.P.O. Box 894 Indianapolis, Indiana 46206-0894www.allisontransmission.com

ii

WARNINGS, CAUTIONS, AND NOTES

IT IS YOUR RESPONSIBILITY to be completely familiar with the warnings and cautions described in this handbook. It is, however, important to understand that these warnings and cautions are not exhaustive. Allison Transmission could not possibly know, evaluate, and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, Allison Transmission has not undertaken any such broad evaluation. Accordingly, ANYONE WHO USES A SERVICE PROCEDURE OR TOOL WHICH IS NOT RECOMMENDED BY ALLISON TRANSMISSION MUST first be thoroughly satisfied that neither personal safety nor equipment safety will be jeopardized by the service methods selected.

Proper service and repair is important to the safe, reliable operation of the equipment. The service procedures recommended by Allison Transmission and described in this handbook are effective methods for performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.

Three types of headings are used in this manual to attract your attention. These warnings and cautions advise of specific methods or actions that can result in personal injury, damage to the equipment, or cause the equipment to become unsafe.

WARNING:

A warning is used when an operating procedure, practice, etc., if not correctly followed, could result in personal injury or loss of life.

CAUTION:

A caution is used when an operating procedure,practice, etc., if not strictly observed, could result in damage to or destruction of equipment.

NOTE:

A note is used when an operating procedure, practice, etc., is essential to highlight.

TRADEMARK INFORMATION

DEXRON

is a registered trademark of General Motors Corporation.

TABLE OF CONTENTS

Warnings, Cautions, andTrademark Information.

Keeping That Allison AdTypical MT, HT, CT SerA Brief Description of thElectronic Control. . . . . Torque Converter . . . . . Lockup Clutch. . . . . . . . Planetary Gears and ClutOutput Retarder. . . . . . . Input Retarder . . . . . . . . Cooler, Filter Circuits . . Transfer Gear Housing (Manual Disconnect Clutc

Shift Selectors . . . . . . . . Range Selection MT, Range Selection HT, Range Selection HT 7

Status Lights . . . . . . . . . Hold-In-Gear. . . . . . . . . Reset Procedure . . . . . . Throttle Control . . . . . . Downshift Control . . . . Downshift or Reverse InUsing the Engine to SlowUsing the Retarder . . . . Two-Speed Axle . . . . . . iii

Page

Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

INTRODUCTION

vantage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1ies Transmission Models. . . . . . . . . . . . . . . . . . . . . . 2e Allison Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7ches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Dropbox) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8h . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

SHIFT SELECTORS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9MTB 648; HT, HTB 741, 748 . . . . . . . . . . . . . . . . . 10HTB 755CR; CLT, CLBT 755 . . . . . . . . . . . . . . . . . 1155DR; HT 755DR DB; CLT, CLBT 755 . . . . . . . . . 12

DRIVING TIPS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15hibit Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 the Vehicle or Equipment . . . . . . . . . . . . . . . . . . . . 16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Cold Weather Starts . . . Driving on Ice or Snow. Rocking Out . . . . . . . . . High Fluid Temperature Parking Brake . . . . . . . . Towing or Pushing . . . .

P

Converter-Driven PTO . Engine-Driven PTO . . .

Periodic Inspections . . . Prevent Major ProblemsImportance of Proper FluFluid Check Procedure . Cold Check . . . . . . . . . . Hot Check . . . . . . . . . . . Dropbox Check . . . . . . . Fluid RecommendationsKeeping Fluid Clean . . . Fluid and Internal Filter External Filter Change .

Owner Assistance . . . . . Service Literature . . . . . iv

Page

DRIVING TIPS (contd)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

OWER TAKEOFF OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

CARE AND MAINTENANCE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23id Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Change Intervals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

CUSTOMER SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

INTROD

KEEPING THAT AL

ALLISON AUTOMATICmay encounter vigorous, more efficient.

These AUTOMATICS arservice. This handbook wequipped vehicle.

H

YUCTION

LISON ADVANTAGE

ILL

SPEEDZONE

R R

STOP

I E L D

V017241

S provide many advantages for the driver whose vehicle tough use and sometimes abuse. Driving is easier, safer, and

e rugged and are designed to provide long, trouble-free ill help you gain maximum benefits from your ALLISON-

TYPICAL MT, HT, CT SERIES TRANSMISSION MODELS

MTB

HT 742

648 Transmission Left-Front View

1, 748 Transmission Left-Rear View

HT 7

HT 73

55CR Transmission Left-Rear View

55DR Transmission Left-Rear View

CLBT

HT 4

755 Transmission Left-Front View

746 Transmission Left-Rear View

A BRIEF DESCRIP

The transmissions describCommercial Electronic Cplanetary gear train. Somand/or transfer gear housi

ELECTRONIC CON

The Allison Transmissionmajor components connethrottle position sensor, spthrottle position sensor, spECU. The ECU processessolenoids located on the csolenoids affects hydraulilockup functions.

In addition to controlling system for conditions thaof these conditions is detemanner which will ensure

The ECU is programmedcharacteristics for a speciall of the possible combinoperating characteristics mmanufacturer.

TORQUE CONVERT

The torque converter conpump is the input elemenoutput element and is hyd(torque multiplying) elemconverter is multiplying tthe stator starts to rotate wmultiplication stops and t

NOTE:

Allison MT, Hcontrol systemand other guidelectromagne5

TION OF THE ALLISON AUTOMATICed in this handbook include an Allison Transmission ontrol System, a torque converter, a lockup clutch, and a e transmissions also include an input or output retarder ng (dropbox).

TROL Commercial Electronic Control System consists of five cted by wiring harnesses Electronic Control Unit (ECU), eed sensor, range selector, and control valve body. The eed sensor, and range selector transmit information to the this information and then sends signals to actuate specific ontrol valve body in the transmission. The action of the c circuits which in turn control the upshifts, downshifts, and

the operation of the transmission, the ECU monitors the t could affect transmission and vehicle operation. When one cted, the ECU is programmed to automatically respond in a safe operation of the vehicle and the transmission.

at the factory to provide the most suitable operating fic application. This handbook does not attempt to describe ations. The information contained herein describes only the ost frequently requested by the vehicle or equipment

ERsists of three elements pump, turbine, and stator. The t and is driven directly by the engine. The turbine is the raulically driven by the pump. The stator is the reaction ent. When the pump turns faster than the turbine, the torque

orque. When the turbine approaches the speed of the pump, ith the pump and turbine. When this occurs, torque

he torque converter functions as a fluid coupling.

T, and CT Series transmissions commercial electronic s are designed and manufactured to comply with all FCC elines regarding radio frequency interference/

tic interference (RFI/EMI) for transportation electronics.

TORQUECONVERTER

EP

LOCKUPCLUTCH

CONVERTER-PTO

ENGINE-DRIVENPTO GEAR SIDE

TORQUECONVERTER

FORWCLUT

LOCKUPCLUTCH

CONTROLHARNESS

OILPUMP

CONTROLVALVEBODY6

Cross Section of CLBT 755

Cross Section of HTB 748

L01860

NGINE-DRIVENTO GEAR TOP

FORWARDCLUTCH

FOURTHCLUTCH

FIFTHCLUTCH

THIRDCLUTCH

FIRSTCLUTCH

OUTPUTSHAFT

LOWPLANETARY

SPEEDSENSOR

SPEEDSENSOR

GEARSPEEDOMETER

DRIVE GEAR

REARPLANETARY

FRONTPLANETARY

DRIVENCONTROL

SOLENOIDSAND HARNESS

HYDRAULICRETARDER

CONTROLVALVEBODY OIL

FILTERCENTER

PLANETARY

SECONDCLUTCH

V01862.01

ARDCH

FOURTHCLUTCH

THIRDCLUTCH

FIRSTCLUTCH

RETARDERCLUTCH

RETARDERROTOR

SPEEDSENSOR

SPEEDOMETERDRIVE GEAR

ACCUMULATORREARPLANETARY

FRONTPLANETARY

CONTROLSOLENOID

OILFILTER

CENTERPLANETARY

SECONDCLUTCH

LOCKUP CLUTCH

The lockup clutch is locaelements piston, clutchby the engine. The clutchsplined to the converter tuto electronic signals fromreaches a predetermined sdrive from the engine to tto provide maximum fuel

The lockup clutch releasefrom the engine is transmgearing. The lockup clutcconditions.

PLANETARY GEAR

A series of planetary gearfor the vehicle. Power floclutch packs. The clutcheelectronic signals from th

TORQUECONVERTER

FOC

LOCKUPCLUTCH

CONTHARN

OILPUMP

CONTROLVALVEBODY7

Cross Section of MT 648

ted inside the torque converter and consists of three plate, and backplate. The piston and backplate are driven

plate, located between the piston and the backplate, is rbine. The lockup clutch is engaged and released in response the ECU. The lockup clutch engages when the vehicle peed. Engagement of the lockup clutch provides a direct he transmission gearing. This eliminates converter slippage economy.

s at lower speeds. When the lockup clutch is released, drive itted hydraulically through the converter to the transmission h also releases when the ECU detects certain undesirable

S AND CLUTCHESs and shafts provide the gear ratios and direction of travelw through the planetaries is controlled by pairs of multiplate s are applied and released hydraulically in response to e ECU.

RWARDLUTCH

THIRDCLUTCH

FOURTHCLUTCH

FIRSTCLUTCH

SPEEDSENSOR

SPEEDOMETERDRIVE GEAR

REARPLANETARY

FRONTPLANETARY

CONTROLSOLENOID

ROLESS

OILFILTER

CENTERPLANETARY

SECONDCLUTCH

V01863.01

OUTPUT RETARDE

The output retarder is locmultiplate clutch pack ancontrol valve instantly relclutch. The clutch and the

INPUT RETARDER

The input retarder is locathousing. The retarder conshaft. When the retarder iand slows the vehicle.

COOLER, FILTER C

The transmission fluid is cooling system. Connectitransmission. On non-retaright side of the converterlower right side of the traand FROM COOLER poauxiliary oil filter may be

Connections for the exterof the transmission. The Tconverter housing and theconverter housing. When on the lower left side of th

TRANSFER GEAR

HT 755DR (DB) transmiwith a dropbox. The droptransmission adapter housthan vertical. It provides arear location is in line witof the drive, idler, and dri

MANUAL DISCONN

Transmissions equipped wone or all three output locby movement of the shift8

Rated in the rear of the transmission and consists of a d a vaned rotating element. When the retarder is applied, a eases fluid to fill the retarder cavity and applies the retarder rotating element act together to quickly slow the vehicle.

ed between the converter housing and the transmission main sists of a vaned rotating element that is splined to the input s applied, a control valve fills the retarder cavity with fluid

IRCUITScooled by a separate oil cooler or connection to the engine ons for the cooler circuit are located on the right side of the rder models, the TO COOLER port is located on the upper housing and the FROM COOLER port is located on the nsmission housing. Retarder models have the TO COOLER rts located on the front of the retarder control valve. An installed in the cooler return line on non-retarder models.

nally-mounted, primary oil filter are located on the left side O FILTER port is located on the upper left side of the FROM FILTER port is located on the lower left side of the an input retarder is used, the FROM FILTER port is located e retarder housing.

HOUSING (DROPBOX)ssions and some CL(B)T 700 transmissions are equipped box is a vertical transfer gear case mounted to the rear of the ing. It can be mounted in any one of four positions, other 1.00:1 gear ratio at three specific output locations. The top

h the input. The bottom rear and bottom front are extensions ven gears in the dropbox.

ECT CLUTCHith a dropbox may have a disconnect clutch mounted at any

ations of the dropbox. The clutch is engaged or disengaged er shaft that extends from the clutch housing.

SHIFT SELECTORS

T

The vehicle manufacturerequipment. The shift seleof those shown above.

The pushbutton shift selecbutton switches. Each padthe desired operating rangtone will let you know the

The optional lever selectocan vary according to the releasing a position holdinmove between drive posit

When your vehicle is equiselect the right moment toconditions. The ALLISONranges and when to select

RND3

DONOT

SHIFT

12

FOUR-SPEEDTOUCH-PADSELECTOR

SHIFT SEypical MT, HT, CT Shift Selectors

s may choose different types of shift selectors for their ctor in your Allison-equipped vehicle will be similar to one

tor is an electronic control unit with membrane-type push- (R, N, D, 4, 3, 2, and 1) is a switch. Just push on the pad for e. A slight click will be felt, the pad will light up, and a beep transmission is ready to operate within the selected range.

r is an electro-mechanical control. The pattern of positions shift selector installed. Positions (R, N, and D) are selected by

RND4

DONOT

SHIFT

21

3

FIVE-SPEEDTOUCH-PADSELECTOR

FOUR-SPEEDLEVER

SELECTOR

FIVE-SPEEDLEVER

SELECTOR V01861

DO NOTSHIFT

DO NOTSHIFT

RND321

DO NOTSHIFT

DO NOTSHIFT

RND4321

LECTORS9

g button and choosing the desired range. It is possible to ions without releasing the position holding button.

pped with an ALLISON AUTOMATIC, it is not necessary to upshift or downshift during the changing road and traffic AUTOMATIC does it for you. However, knowledge of the

them will make vehicle control and your job even easier.

RANGE SELECTION MT, MTB 648; HT, HTB 741, 748, HT 746

R

Use this to bafrom forwardsignal is activ

N

Use this positiand for extendautomatically

starts in any otshould be repa

unattended w

N

eutral is alsovehicle is equi

D

The vehicle wthe transmissrange operatiautomatically

32

Occasionally,restrict the auprovide progrgrades (the lo

1

Use this rangmaneuvering Low range prlow range pro

NOTE:

Some transmFor these uni

WARNING: Take the following precautions so that unexpected, possible sunecessary trunning, plparking bra

WARNINGcan result iavailable in10

ck the vehicle. Completely stop the vehicle before shifting to reverse or from reverse to forward. The reverse warning ated when this range is selected.

on when starting the engine, when checking vehicle accessories, ed periods of engine idle operation. The transmission will select Neutral when the master switch is turned on. If the engine her selected range, the neutral start circuit is malfunctioning and ired immediately. Use Neutral when the vehicle will be left ith the engine running always apply the parking brake. used during stationary operation of the power takeoff (if your pped with a PTO). ill start in first (or second) range, and as the speed increases,

ion will automatically upshift through each range to fourth on. As the vehicle slows down, the transmission will downshift to the correct range.

the road, load, or traffic conditions will make it desirable to tomatic shifting to a lower range. These positions also essively greater engine braking for going down medium wer the range the greater the braking effect). e when pulling through mud and deep snow, when in tight spaces, or while driving up or down steep grades. ovides the vehicle with its maximum driving power. Also, vides maximum engine braking power.

issions are programmed to always start in second range.ts, to get first range operation, you must select first range.

dden vehicle movement is avoided. Whenever it becomes o leave the vehicle, even momentarily, while the engine is ace the transmission shift selector in Neutral, set the ke and/or emergency brakes, and chock the wheels.

: Do not allow the vehicle to coast in neutral. This practice n severe transmission damage. Also, no engine braking is neutral.

RANGE SELECTION

RANGE SELECTION

R

Use this to bequipment bforward. Theselected.

N

Use this wheaccessories, transmissionturned on. Ifcircuit is maNeutral wheengine runniduring statioequipment is

D

The vehicle speed increarange to fifththe transmis

432

Occasionallyrestrict the aprovide proggrades (the l

WARNINGupshifting adownhill ophighest seleand damagior retarder

WARNINGpossible sunecessary trunning, plparking bra


HT, HTB 755CR; CLT, CLBT 755

MT, MTB 648; HT, HTB 741, 748 (contd)

ack the vehicle or equipment. Completely stop the vehicle or efore shifting from forward to reverse or from reverse to reverse warning signal is activated when this range is

n starting the engine, when checking vehicle or equipment and for extended periods of engine idle operation. The will automatically select Neutral when the master switch is the engine starts in any other selected range, the neutral start lfunctioning and should be repaired immediately. Use n the vehicle or equipment will be left unattended with the ng always apply the parking brake. Neutral is also used nary operation of the power takeoff (if your vehicle or equipped with a PTO).or equipment will start in first (or second) range, and as the ses, the transmission will automatically upshift through each range operation. As the vehicle or equipment slows down,

sion will automatically downshift to the correct range.

, the road, load, or traffic conditions will make it desirable to utomatic shifting to a lower range. These positions also ressively greater engine braking for going down medium ower the range, the greater the braking effect).

: The transmission incorporates a hold feature to prohibit bove the range selected during normal driving. For eration, however, the transmission may upshift above the cted range when the engine governed speed is exceeded ng engine overspeed is a possibility. Use the vehicle brakes to prevent exceeding governed speed in the held range.

: Take the following precautions so that unexpected, dden vehicle movement is avoided. Whenever it becomes o leave the vehicle, even momentarily, while the engine is ace the transmission shift selector in Neutral, set the ke and/or emergency brakes, and chock the wheels.


RANGE SELECTION

RANGE SELECTION

1

Use this rangmaneuveringwhen maximor equipmenmaximum en

NOTE:

Some transmFor these un

R

Use this to bequipment bforward. Theselected.

N

Use this wheaccessories,transmissionturned on. Ifcircuit is mawhen the verunning astationary opequipped wi

WARNINGupshifting adownhill ophighest seleand damagior retarder

WARNINGpossible sunecessary trunning, plparking bra


HT 755DR; HT 755DR DB; CLT, CLBT 755

HT, HTB 755CR; CLT, CLBT 755 (contd)e when pulling through mud and deep snow, when in tight spaces, or while driving up or down steep grades or um output power is required. Low range provides the vehicle t with its maximum driving power. Also, low range provides gine braking power.

issions are programmed to always start in second range.its, to get first range operation, you must select first range.

ack the vehicle or equipment. Completely stop the vehicle or efore shifting from forward to reverse or from reverse to reverse warning signal is activated when this range is

n starting the engine, when checking vehicle or equipment and for extended periods of engine idle operation. The will automatically select neutral when the master switch is the engine starts in any other selected range, the neutral start lfunctioning and should be repaired immediately. Use neutral hicle or equipment will be left unattended with the engine lways apply the parking brake. Neutral is also used during eration of the power takeoff (if your vehicle or equipment is

th a PTO).


: Take the following precautions so that unexpected, dden vehicle movement is avoided. Whenever it becomes o leave the vehicle, even momentarily, while the engine is ace the transmission shift selector in Neutral, set the ke and/or emergency brakes, and chock the wheels.


RANGE SELECTION HT 755DR; CLT, CLBT 755

(contd)

D

The vehicle or equipment will start in second range, and as the speed increases, the transmission will automatically upshift to third, fourth, and fifth range. As the vehicle or equipment slows down, the transmission will automatically downshift to the correct range.

432

Occasionally the road, load, or traffic conditions will make it desirable to restrict the automatic shifting to a lower range. The vehicle or equipment will start in second range and automatically upshift to the highest selected range. These positions also provide progressively greater engine braking for going down medium grades (the lower the range, the greater the braking effect).

1

This is the creeper range select this range for off-highway operations. Also, use this range when pulling through mud and deep snow, when maneuvering in tight spaces, or while driving up or down steep grades or when maximvehicle or eqengine brakiinhibit full preduced befo

WARNINGupshifting adownhill ophighest seleand damagior retarder 13

um output power is required. This range provides the uipment with its maximum driving power and maximum ng power. The Commercial Electronic Control system will ower upshifts from first to second. Engine speed must be re an upshift can be made.


When programmed operatakes action to protect theTRANS light on your insNOT SHIFT light, whichNOT SHIFT light comes a problem. Whenever eithto ensure the safest possib

STATUS LIGHTS

Every time the engine is seconds. This momentaryproperly. If either status lreplace the bulb.

Illuminationnot perform

CHECK TR

continue to vehicle mayconditions cwill take act

Illuminationfrom the shiOperation mmay not resare being plbe restricted

moved whil

sounded. Thprevious po

pushbutton requests. Th

disengage t

CHECKTRANS

DO NOTSHIFT

ting parameters have been exceeded, the ECU automatically vehicle and the transmission. If this occurs, the CHECK trument panel, or the CHECK TRANS light and the DO is located on your shift selector, will turn on. When the DO on, a buzzer is also sounded for a moment to tell you there is er one of these lights come on, the transmission will respond le operation of the vehicle.

started, the status lights come on. They go off after a few lighting is to show that the light bulbs are working ight does not come on during engine start, immediately

of this light will notify the driver that the transmission is ing as designed. No audible alarm will alert the driver that

ANS has been illuminated. Although the transmission can operate, service advice should be sought promptly. The continue to be driven to complete the desired mission if an be negotiated safely. However, in some cases the ECU ion, such as restricting operation to one range only.

of this light, accompanied by ten seconds of short beeps ft selector, indicates that shifts are being restricted. ay continue in order to reach service assistance. The ECU

pond to shift selector requests since operating limitations aced on the transmission; i.e., upshifts and downshifts may . Direction changes will not occur. If the shift lever is e DO NOT SHIFT is indicated, a continuous alarm will be

DRIVING TIPS14

e alarm will stop when the lever is moved back to the sition where DO NOT SHIFT was first indicated. For shift selectors, the ECU will not respond to operator e ECU will cause the transmission to Hold-In-Gear and he lockup clutch.

HOLD-IN-GEAR

The hold-in-gear feature pin the operation of the trato continue to operate in tbuzzer came on. SelectionThe transmission will notwhen the ECU detected thengine is shut off. If the pwhen the engine is startedneutral until the problem

RESET PROCEDUR

When the status light (or lthe system.

To reset the ECU, bengine. Wait 10 sec

If the problem is teand your vehicle w

If the problem is noand the transmissiooperate in a normadepend on the type

THROTTLE CONTR

The position of the throttlwide open throttle, upshifthrottle, upshifts will occuthrottle position sensor, w

DOWNSHIFT CON

Downshift control meansencounter or expect to engive you better control onto lower ranges increasesprevents cycling betweenup-and-down grades.15

revents upshifts and downshifts when a problem is detected nsmission. The hold-in-gear circuit permits the transmission he range it was in at the time the DO NOT SHIFT light and of a different range will have no effect on the transmission. upshift or downshift but will remain in the range it was in e problem. The hold-in-gear circuit is released when the

roblem causing the hold-in-gear condition is still present , the transmission will be in neutral and will remain held in is corrected.

Eights) comes on, a reset procedure can be performed to clear

ring the vehicle to a stop at a safe location and shut off the onds and restart the engine.mporary, the status light (or lights) will not come back on ill operate in a normal manner.t temporary, the status light (or lights) will come back on n may stay in neutral, operate in only the lower ranges, or l manner. The type of operation permitted by the ECU will of problem.

OLe influences the speed at which automatic shifting occurs. At ts will occur automatically at high engine speeds. At part r at lower engine speeds. Throttle position is sensed by the hich is connected to the engine throttle lever.

TROL selection of a lower range to match driving conditions you counter. Learning to take advantage of a downshift will slick or icy roads and on steep downgrades. Downshifting engine braking. The selection of lower range often a range and the next higher range on a series of short

DOWNSHIFT OR RAlthough there is no safeand reverse. Downshiftinmaximum speed attainabto protect against these imtoo high a speed, the ECUspeed is reached.

USING THE ENGIN

To use the engine as a braexceeding the maximum brakes to slow the vehicleautomatically downshift tcontrol for going down himay be desirable to prese

USING THE RETARThe MTB 600/HTB 700 speeds. Use the retarder amost effective during highwhen using this type of re

Depending on the vehiclewhen maximum applicati

WARNINGThe retardermake vehiclretarder contconditions im

16

EVERSE INHIBIT FEATURE

ty speed limitation on upshifting, there is on downshifting g should be avoided when the vehicle is above the le in the next lowest range. However, the ECU is designed proper shifts. If a downshift or reverse shift is selected at will prevent the shift from taking effect until a safe lower

E TO SLOW THE VEHICLE

king force, select the next lower range. If the vehicle is speed for this range, use the retarder (if equipped) or service . When a safe lower speed is reached, the ECU will he transmission. Engine braking provides good speed lls. When the vehicle is heavily loaded, or the hill is steep, it lect a lower range prior to cresting the top of the hill.

DER

Series output retarder is effective over a wide range of ny time you want to slow down. The HT 700 input retarder is retarder rotor speed. Selecting a lower hold range position tarder is recommended for maximum effect.

control system used, partial retarder application is available on is not needed.

:

Do not use the retarder when roads are slick or hazardous. braking effect will occur only at the driving axle and could e control difficult. On vehicles equipped with an integral rol, place the control bypass switch to OFF until road prove.

TWO-SPEED AXLE

The two-speed axle may bmoving without damaginmanufacturers recommenrecommended that axle shprevent a transmission sh

COLD WEATHER S

Most transmissions are prlowest range in the

D

(Dr

CAUTIONS

equipped wi

APPLY ACLOSED

DO NOTSLIPPER

OBSERVLIMITS Arange to iavailable

In the eveREDUCE

OBSERVvehicle c

DO NOTSIMULTAExtreme the transm17

e shifted from low to high or high to low while the vehicle is g the transmission. However, the axle or vehicle dations should be followed for shifting the axle. It is ifts be made with the transmission in the highest range to

ift from coinciding with an axle shift.

TARTSogrammed to restrict operation to neutral, reverse, and the ive) range until the following temperatures are reached.

: Observe the following cautions when driving a vehicle th an input or output retarder.

ND OPERATE THE RETARDER WITH ENGINE AT THROTTLE ONLY.

USE THE RETARDER WHEN ROAD SURFACES ARE Y. De-energize the system at the master control switch.E TRANSMISSION AND ENGINE TEMPERATURE T ALL TIMES. Select the lowest possible transmission

ncrease the cooling system capacity and total retardation .nt of OVERHEATING, DECREASE VEHICLE SPEED TO RETARDATION POWER REQUIREMENTS.E THE RETARDER ALERT LIGHT to ensure that the

ontrol system is functioning properly. OPERATE THE INPUT OR OUTPUT RETARDER

NEOUSLY WITH AN ENGINE EXHAUST BRAKE. torque loads can be produced in the range section, damaging

ission.

Listed below are the miniIf auxiliary heating equiptemperature limit. If not atemperature.

DRIVING ON ICE O

Here is where all of your awhat transmission you habefore you lose traction. Smaintain. Accelerate or dimportant to slow gradualdownshift to the lower ranselected before attemptinduring acceleration.

Sump OilTemperature

DO NOT SHIFT CHECK TRANS

25F (32C)and below

24F (31C) to +19F (7C)

20F (7C)and above

* Transmissions used in emerg

DEXRON

C-4 SAE

C-4 SAE

WARNING

De-energize18

mum fluid temperatures below which preheating is required. ment is available, preheat the fluid to the minimum vailable, run the engine in neutral to raise the fluid

R SNOW

bility as a professional driver comes into focus regardless of ve. If possible, reduce your speed and select a lower range elect the range that will not exceed the speed you expect to

ecelerate very gradually to prevent losing traction. It is very ly when a lower range is selected. This will ensure a smooth ge. Also, it is important that you reach the lower range

g to accelerate. This will avoid an unexpected downshift

Light Light Operation*ON ON Neutral only

OFF OFF Neutral, first, second, or reverse

OFF OFF Full operationin all ranges

ency vehicles do not have programmed temperature restrictions.

FluidMinimum Fluid

Temperature-III 17F (27C)

10W 4F (20C) 30 32F (0C)

: Do not use the retarder when roads are slippery. the retarder at the master control switch.

ROCKING OUT

If the vehicle is stuck in dShift to D (Drive) and appvehicle has rocked forwarbrakes. Allow the engine and apply a steady, light thgo. Again apply and hold procedure may be repeatemove the vehicle a greatechanges when the engine

HIGH FLUID TEMPIf the sump fluid temperaapplications, the CHECKoperation in higher rangelight will not come on

, an

If the transmission overhetransmission. (Refer to thMAINTENANCE section

Extended operations at loexcessively high fluid temto overheat the engine coo

If the CHECK TRANS lia high temperature, the trcheck the cooling system12001500 rpm with the and engine temperatures

CAUTION:

when the engturning, do nmore than 30to overheat aTRANS lighthe engine at

19

eep sand, snow, or mud, it may be possible to rock it out.

ly steady, light throttle (never full throttle). When the d as far as it will go, apply and hold the vehicle service to return to idle; then select

R

(Reverse). Release the brakes rottle and allow the vehicle to rock in reverse as far as it will

the service brakes and allow the engine to return to idle. This d in drive and reverse if each directional shift continues to r distance. Never make neutral-to-range or directional shift rpm is above idle.

ERATURE

ture reaches 270F (132C) in non-emergency vehicle TRANS light will come

on

and the ECU will inhibit s. In emergency vehicle applications, the CHECK TRANS

d the ECU will not inhibit operation in higher ranges.

ats during normal operations, check the fluid level in the e fluid check procedure as described in the CARE AND of this handbook.)

w vehicle speeds with the engine at full throttle can cause peratures in the transmission. These temperatures may tend ling system as well as cause possible transmission damage.

ght comes on and the engine temperature gauge indicatesansmission is probably overheated. Stop the vehicle and . If it appears to be functioning properly, run the engine at transmission in neutral. This should reduce the transmission to normal operating levels in two or three minutes.

DO NOT make neutral-to-range or directional shift changes ine rpm is above idle. If the wheels are stuck and not ot apply full power for more than 30 seconds. Full power for seconds under these conditions will cause the transmission nd the CHECK TRANS light will come on. If the CHECK t comes on due to overheating, shift to neutral and operate fast idle until the CHECK TRANS light goes off.

If the engine temperature gauge indicates a high temperature and the CHECK TRANS light is not

on

, an engine problem is indicated. If high temperature in either the engine or transmission persists, stop the engine and have the overheating condition investigated by maintenance personnel.

PARKING BRAKEThere is no P (Park) position on the shift selector. Therefore, always select N (Neutral) and apply the parking brake to hold the vehicle when it is parked.

TOWING OR PUSHThe engine cannot be starvehicle, the driveline shouthe road. If the vehicle is Then cover the wheel opeAn auxiliary air supply w

CAUTION: The engine should never be operated for more than 30 seconds at full throttle with the transmission in gear and the output stalled. Prolonged operation of this type will cause the transmission fluid temperature to become excessively high and will result in severe overheat damage to the transmission.

CAUTION:shafts before20

INGted by pushing or towing. Before pushing or towing a ld be disconnected or the drive wheels should be lifted off

a motor coach, remove the axle shafts from the drive wheels. nings to prevent loss of lubricant and entry of dust and dirt. ill usually be required to actuate the vehicle brake system.

Failure to disconnect the driveline or remove the axle pushing or towing can cause serious transmission damage.

CONVERTER-DRIVA power takeoff may be mtransmission. The PTO drvariable speeds. The powor stopped. However, on stransmission is in the neu

To operate the power take

Stop the vehicle, se Select the desired r Depress the acceler

type operation will

To operate the power take

Set the parking bra Place the shift sele Engage the PTO. Select N (Neutral)

To disengage the power ta

Stop the vehicle. Idle the engine and Select a drive range Select N (Neutral).

CAUTION:ment during

POWER TAKEOFF OPEREN PTOounted onto the mounting pad on the side of the

ive gear is converter-driven and thus provides infinitely er takeoff can be operated when the vehicle is either moving ome applications the PTO can only be operated when the tral mode.

off while the vehicle is moving, follow these instructions:

t the brakes, and idle the engine.ange and engage the PTO.ator as required. The speed of the power takeoff during this be affected by the range selected and speed of the vehicle.

off with the vehicle stopped, follow these instructions:

ke and idle the engine.ctor in a drive range.

and depress the accelerator to the desired speed.keoff:

set the brake.

Do not exceed the speed limits imposed on the driven equip- operation of the PTO.

ATION21

and disengage the PTO.

ENGINE-DRIVEN PTO

Some models provide PTO mountings on the top and side of the torque converter housing. The type of PTO installed will determine the operating procedures.

If the PTO driven gear is in constant mesh with the drive gear in the converter housing, and a friction clutch is used to connect the PTO load, the PTO can be engaged or disengaged at any time (except at engine speeds that exceed drive speed limits imposed on the driven equipment). If the PTO is engaged by either a sliding gear or dog clutch, the vehicle engine must be stopped to engage or disengage the PTO.

CAUTION: Do not exceed the drive speed limits of the driven equipment.22

PERIODIC INSPECThe ALLISON AUTOMAthe fluid level and the conimportant.

For easier inspection, the loose bolts and leaking fluregularly. Check the engifluid, which would indicamaintenance personnel.

PREVENT MAJOR Help the Commercial EleMinor problems can be kmaintenance personnel w

Shifting feels odd Transmission leaks Unusual transmissi

thermostatic fan cy CHECK TRANS l

IMPORTANCE OF Because the transmissionimportant that the proper low the converter and clulevel is too high the fluid

An improper fluid level m

Turn on the CHEC Prevent operation i

CAREMAINTETIONSTIC requires minimum maintenance. Careful attention to nections for the electronic and hydraulic circuits is most

transmission should be kept clean. Make periodic checks for id lines. Check the condition of the electrical harnesses

ne cooling system occasionally for evidence of transmission te a faulty oil cooler. Report any abnormal condition to your

PROBLEMSctronic Controls monitor the operation of the transmission. ept from becoming major problems if you notify hen one of these conditions occur:

fluidon-related sounds (changes in sound caused by engine cling are normal)ight comes on frequently

PROPER FLUID LEVEL fluid cools, lubricates, and transmits hydraulic power it is fluid level be maintained at all times. If the fluid level is too tches will not receive an adequate supply of fluid if the

ANDNANCE23

will aerate and the transmission will overheat.

ay cause the electronic controls to do two things:

K TRANS lightn higher ranges

When the fluid level is co

The DO NOT SHIFT anregular fluid level checkservice instructions, and p

FLUID CHECK PRO

Clean around the end of t

Always check the transmimportant in maintaining transmission breather andfree of debris.

An accurate fluid level cneutral, the transmissioa level surface.

The transmission and truses a different grade of

COLD CHECK

If the engine has belevel surface and ap

Run the engine forto clear the fluid syto idle.

WARNINGpossible sudnecessary torunning, plaparking brak

CAUTION:fluid systemtransmissionfollowing prmaintenance

NOTE:The purpose oenough fluid 24

rrected, the transmission will return to normal operation.

d CHECK TRANS lights should not be used to replace s. Check the level at the intervals specified in your vehicle revent a problem on the road.

CEDURE

he fill tube before removing the dipstick.

ission fluid level a minimum of two times. Consistency is accurate readings. If inconsistent readings persist, check the the vent hole in the fill tube to ensure that they are clean and

heck cannot be made unless the engine is idling in n fluid is at the proper temperature, and the vehicle is on

ansfer case have separate fluid systems. Each system fluid.

en shut down for an extended time, park the vehicle on a ply the parking brake.

at least one minute. Shift to D (Drive) and then R (Reverse) stem of air. Then shift to N (Neutral) and allow the engine

: Take the following precautions so that unexpected, den vehicle movement is avoided. Whenever it becomes leave the vehicle, even momentarily, while the engine is ce the transmission shift selector in Neutral, set the e and/or emergency brakes, and chock the wheels.

Dirt or foreign matter must not be permitted to enter the because it can cause valves to stick, cause undue wear of parts, or clog passages. Check the fluid level by the ocedure and report any abnormal level to your personnel.

f the cold check is to determine if the transmission has to be safely operated until a hot check can be made.

After wiping the diwithin the COLD Rthe middle of the C

Perform a hot checkis reached.

HOT CHECKThe fluid must be hot to eincreases.

Operate the transm(160220F; 7110

Park the vehicle onbrake and allow the

After wiping the dianywhere within th

If the level is not wlevel to the middle

DROPBOX CHECKThe fluid must be hot to e

To check the fluid lfill tube, remove thIf the dropbox has Safe level for the dthe dipstick.

FLUID RECOMMENHydraulic fluids used in treliability and durability. or SAE 30) are recommenhighway applications. Usabove 85F (30C).Some DEXRON-III fluioff-highway applications.C-4 fluid must never be uAllison Transmission deais also a qualified C-4 flu25

pstick clean, check the fluid level. If the fluid level is not UN band, add or drain fluid as necessary to bring the level to OLD RUN band. after normal operating temperature (160220F; 71105C)

nsure an accurate check. The fluid level rises as temperature

ission in D (Drive) until normal operating temperature5C) is reached. a level surface and shift to N (Neutral). Apply the parking engine to idle.

pstick clean, check the fluid level. The safe operating level is e HOT RUN band on the dipstick.ithin this band, add or drain fluid as necessary to bring the of the HOT RUN band.

nsure an accurate check.

evel in the dropbox, turn off the engine. If the dropbox has a e fill tube plug. The fluid should be at the top of the tube.a dipstick, remove it, wipe it clean, and insert the dipstick. ropbox is any level between the ADD and FULL marks on

DATIONShe transmission are important influences on transmission DEXRON-III and C-4 fluids (Allison approved SAE 10W ded. C-4 fluid is the only one approved for use in off-

e C-4 SAE 30 where ambient temperature is consistently

ds are also qualified as C-4 fluids and may be used in However, a DEXRON fluid which is not a qualifiedsed in off-highway applications. Consult your localler or distributor to determine if a DEXRON-III fluidid.

Before using C-4 fluids, consult the vehicle manufacturer to ensure that materials used in tubes, hoses, external filters, seals, etc., are compatible with C-4 fluids. Also, consult your local Allison Transmission dealer or distributor to determine if the fluid you have selected is an approved C-4 fluid.

KEEPING FLUID CIt is absolutely necessary clean containers to preven

FLUID AND INTERChange the fluid and intechanges may be required and temperature.

Table

CAUTION:should not b

TransmissionFl

MT(B) 600 Series(On-Highway)

25,or 1

MT(B) 600 Series(Off-Highway)

100or 1

HT(B) 700 SeriesCL(B)T 700 Series(All Applications)

50,or 1(int

* Whichever occurs first.** Fluid may require chang

whenever there is evidenstrong odor, or fluid ana

*** Local conditions, severitintervals26

LEANthat transmission fluid be clean. The fluid must be handled in t foreign material from entering the transmission.

NAL FILTER CHANGE INTERVALSrnal filter at the intervals specified in Table 1. More frequent when operations are subject to high levels of contamination

1. Fluid and Internal Filter Changes

Containers that have been used for any antifreeze solution e used for transmission fluid.

uid and Internal Filter Change Interval External Filter Element(s)

000 miles (40 000 km)2 months*

After first 5000 miles(8 000 km); thereafter, every 25,000 miles (40 000 km)or 12 months*

0 hours max**2 months*

After first 500 hours; thereafter, 1000 hours max***

000 miles (80 000 km)2 months or 1200 hours* ernal sump at overhaul)

After first 5000 miles(8 000 km); thereafter, every 25,000 miles (40 000 km) or 6 months or 600 hours***

e sooner depending on operating conditions. Fluid must be changed ce of dirt or high temperature condition indicated by discoloration,

lysis.y of operation, or duty cycle may dictate more or less frequent service

EXTERNAL FILTER CHANGEMost external oil filters should be changed after the first 5000 miles and thereafter as shown in Table 1.

Allison high-efficiency external oil filters, which have a change filter indicator, do not need to be changed when the fluid is changed unless restriction is indicated. There is no mileage limitation with the use of Allison high-efficiency filters.

An Allison high-efficiency external oil filter element must be changed if the engine and transmission are at operating temperature (over 160F;71C) and the Change Filter light is illuminated for three years, whicheve

Fluid need not be change

Has been used 12 m Has been used 12 m Is visibly contamin Analysis shows it t

Table 2

Consult your local yellowfirm. Results between firmTechnicians Guide for A

MeasuremViscosityCarbonyl absorbanceTotal acid numberSolids* Note: A = Absorbance un27

for any length of time or the element has not been changed r occurs first.

d at the time of filter replacement unless the fluid:

onths or 25,000 miles (MT)onths or 50,000 miles (HT)

atedo be oxidized beyond the limits listed in Table 2

. Fluid Oxidation Measurement Limits

pages for fluid (oil) analysis firms. Use one fluid analysis s cannot be accurately compared. Refer to GN2055EN,

utomatic Transmission Fluid, for additional information.

ent Limit+/-25% change from new fluid+0.3 A*/0.1 mm change from new fluid+3.0 change from new fluid2% by volume maximum

its.

OWNER ASSISTANThe satisfaction and goodconcern to Allison Transm

As an owner of an Allisonworld that are eager to me

Expert service by t Emergency service Complete parts sup Sales teams to help Product informatio

Normally, any situation thyour transmission will betelephone directory for th

We recognize, however, tmisunderstandings may odeveloped the following tproblem that has not been

Step One Discuss youdistributorship or dealein communication and cahave already discussed thGeneral Manager. All ATproblems originate with adistributorship with whomprovide his ATD distribut

Step Two When it applevel without additional asresponsible for the local Service Managers staff, dCUSTOMERSERVICE

CEwill of the owners of Allison transmissions are of primary ission Division (ATD), its distributors, and their dealers. transmission, you have service locations throughout the et your parts and service needs with:

rained personnel 24 hours a day in many areasport determine your transmission requirementsn and literature

at arises in connection with the sale, operation, or service of handled by the distributor or dealer in your area (check the e Allison Transmission service outlet nearest you).hat despite the best intentions of everyone concerned, ccur. To further assure your complete satisfaction, we have hree-step procedure to be followed in the event you have a handled satisfactorily.

r problem with a member of management from the rship. Frequently, complaints are the result of a breakdown n quickly be resolved by a member of management. If you e problem with the Sales or Service Manager, contact the D dealers are associated with an ATD distributor. If your dealer, explain the matter to a management member of the the dealer has his service agreement. The dealer will 28

ors name, address, and telephone number on request.

ears the problem cannot be resolved readily at the distributor sistance, contact the Allison Transmission Regional Office distributor. You will be assisted by a member of the Regional epending on the nature of your problem.

For prompt assistance, please have the following information available:.

Name and location of authorized distributor or dealer Type and make of equipment Transmission model number, serial number, and assembly number (if equipped

with electronic controls, also provide the ECU assembly number) Transmission delivery date and accumulated miles and/or hours of operation Nature of problem Chronological summary of units history

Step Three If you contacted a regional office and you are still not satisfied, present the entire matter to the Home Office by writing to the following address or calling the phone number below:Manager, Warranty Administration PF9Allison TransmissionP.O. Box 894Indianapolis, IN 46206-0Phone: (317) 242-3538The inclusion of all pertinmatter. If an additional rethat some further action cWhen contacting the Regproblem will likely be resfacilities, equipment, andfollowed in sequence wheYour purchase of an Allissincere desire to assure co29

894

ent information will assist the Home Office in expediting the view by the Home Office of all the facts involved indicates an be taken, the Regional Office will be advised.ional or Home Office, please keep in mind that ultimately the olved at the distributorship or dealership utilizing their personnel. Therefore, it is suggested that the above steps be n experiencing a problem.on Transmission product is greatly appreciated, and it is our mplete satisfaction.

SERVICE LITERATUREAdditional service literature is available. This service literature provides fully illustrated instructions for the operation, maintenance, service, overhaul, and parts support of your transmission. To ensure that you get maximum performance and service life from your unit, see your dealer or distributor for the following publications.

Check the telephone directory for the Allison Transmission distributor or dealer nearest you. If you are undistributor, please contactManager, Product TraininAllison TransmissionP.O. Box 894Indianapolis, IN 46206Phone: (317) 242-0236

PublicationService Manual

Parts CatalogTroubleshooting Manua

Mechanics TipsTechnicians Guide

* Hydraulic Output Retar** CEC Service Manual Su

*** CEC Troubleshooting M**** Automatic Transmission30

able to obtain these publications from your local Allison :g and Technical Publications A01

Table 3. Service Literature

MT, MT(B) HT, HTB CLT, CLBTSM1546EN SM1995EN**

SM2004EN SM1314ENSM1992EN**

PC1996EN PC1965EN PC1993ENl TS2712EN TS2712 EN

TS1960EN***TS2712EN

MT1997EN MT1958EN MT1958ENGN2009EN*GN2055EN****

GN2033ENGN2009EN*GN2055EN****

GN2009EN*GN2055EN****

der Technicians Guidepplementanual Fluid, Technicians Guide

OM1957EN 199509 Printed in USA 199911www.allisontransmission.com

OM1957ENTITLE PAGEWARNINGS, CAUTIONS, AND NOTESTRADEMARK INFORMATIONTABLE OF CONTENTSINTRODUCTIONKEEPING THAT ALLISON ADVANTAGETYPICAL MT, HT, CT SERIES TRANSMISSION MODELSMTB 648 Transmission Left-Front ViewHT 741, 748 Transmission Left-Rear ViewHT 755CR Transmission Left-Rear ViewHT 755DR Transmission Left-Rear ViewCLBT 755 Transmission Left-Front ViewHT 746 Transmission Left-Rear View

A BRIEF DESCRIPTION OF THE ALLISON AUTOMATICELECTRONIC CONTROLTORQUE CONVERTERTYPICAL CROSS-SECTIONSCross Section of CLBT 755Cross Section of HTB 748Cross Section of MT 648

LOCKUP CLUTCHPLANETARY GEARS AND CLUTCHESOUTPUT RETARDERINPUT RETARDERCOOLER, FILTER CIRCUITSTRANSFER GEAR HOUSING (DROPBOX)MANUAL DISCONNECT CLUTCH

SHIFT SELECTORSSHIFT SELECTORSTypical MT, HT, CT Shift Selectors

RANGE SELECTION MT, MTB 648; HT, HTB 741, 748, HT 746RANGE SELECTION MT, MTB 648; HT, HTB 741, 748 (contd)RANGE SELECTION HT, HTB 755CR; CLT, CLBT 755RANGE SELECTION HT, HTB 755CR; CLT, CLBT 755 (contd)RANGE SELECTION HT 755DR; HT 755DR DB; CLT, CLBT 755RANGE SELECTION HT 755DR; CLT, CLBT 755 (contd)

DRIVING TIPSSTATUS LIGHTSHOLD-IN-GEARRESET PROCEDURETHROTTLE CONTROLDOWNSHIFT CONTROLDOWNSHIFT OR REVERSE INHIBIT FEATUREUSING THE ENGINE TO SLOW THE VEHICLEUSING THE RETARDERTWO-SPEED AXLECOLD WEATHER STARTSLow Fluid Temperature RestrictionsMinimum Fluid Temperature

DRIVING ON ICE OR SNOWROCKING OUTHIGH FLUID TEMPERATUREPARKING BRAKETOWING OR PUSHING

POWER TAKEOFF OPERATIONCONVERTER-DRIVEN PTOENGINE-DRIVEN PTO

CARE AND MAINTENANCEPERIODIC INSPECTIONSPREVENT MAJOR PROBLEMSIMPORTANCE OF PROPER FLUID LEVELFLUID CHECK PROCEDURECOLD CHECKHOT CHECKDROPBOX CHECK

FLUID RECOMMENDATIONSKEEPING FLUID CLEANFLUID AND INTERNAL FILTER CHANGE INTERVALSTable 1. Fluid and Internal Filter Changes

EXTERNAL FILTER CHANGETable 2. Fluid Oxidation Measurement Limits

CUSTOMER SERVICEOWNER ASSISTANCESERVICE LITERATURETable 3. Service Literature

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