This manual contains Preventive Maintenance procedures for the Allison Transmission HT 750DR.
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.


TABLE OF CONTENTS

Section I - REMOVING TRANSMISSION FROM VEHICLE
Draining Transmission
Disconnecting Controls
Uncoupling From Driveline And Engine
Removing Mounting Bolts
Removing The Transmission
Removing Input And Output Flange Or Yokes
Rebuild/Overhaul Instructions

Section II - PREPARING TRANSMISSION FOR INSTALLATION
Checking Flywheel (Engine-Mounted Models)
Installing Brake And Output Flange
Installing Input Flange (Remote-Mounted)
Installing Range Selector Lever
Installing PTO (Applicable at Any Location)
Installing Shift Modulation Control
Installing Oil Filler Tube

Section III - PREPARING VEHICLE FOR TRANSMISSION INSTALLATION
Checking Flexplate Drive Assembly
(Transmission Engine-Mounted)
Checking Input Drive Components
(Transmission Remote-Mounted)
Checking Chassis And Driveline
Oil Cooler, Oil Filter, And Lines
Checking Controls

Section IV - INSTALLING TRANSMISSION INTO VEHICLE
Handling
Mounting To Engine (Transmission Engine-Mounted)
Installing Transmission Mounting Components
Rear Support Of The CLBT 750DB
Coupling To Engine (Transmission Remote-Mounted)
Coupling To Driveline
Connecting Cooler And Oil Filter Lines
Connecting Range Selector Control
Connecting Hydraulic Retarder Control (CLBT Models)
Connecting Modulator Control
Connecting Power Takeoff Controls
Connecting Parking Brake Controls
Connecting Output Disconnect Controls
(Dropbox Models Only)
Connecting Speedometer Drive
Installing Temperature And Pressure
Sensors And Electrical Components
Filling The Oil System

SECTION V - OIL SYSTEM
Filling The System
Deep Oil Pan
Oil Pan Interchangeability
Spare Parts Information
Installation Of The 81/2 Inch Transmission Oil Pan Assembly and Oil Filler Tube
Oil Level And Oil Dipstick
Checking Transmission Oil Level
Oil Specifications
Oil Change And Filter Replacement
Oil Operating Temperatures
Oil Level For Transfer Gear Housing (Dropbox)

Section VI - DUAL MODE OPERATION
General Description
Functional Operation
Installation
Downshift Inhibiting - CL(B)T 750 (2100 And 2300 rpm Dropbox Models Only)
CLBT 750 Dual Mode Transmission With Dropbox

Section VII - RELEASE OF STEP GOVERNOR VALVE BODY ASSEMBLY P/N 23010297
General
Interchangeability
Spare Parts Information

Section VIII - MANUAL/AUTOMATIC OPERATION ON OIL FIELD EQUIPMENT
General
Mannesmann Rexroth Corporation Shifter
Bennett Shifter
Preventive Maintenance On Shifters
Mode Shift Valves Used In Mannesmann Rexroth And
Bennett Systems

Section IX - TROUBLESHOOTING CLBT 750 WITH DUAL MODE
Pressure Tap Location
Troubleshooting Dual Mode Circuitry
Step Governor Valve
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ALLISON TRANSMISSION HT 750DR PREVENTIVE MAINTENANCE MANUAL
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Tags
ALLISON TRANSMISSION HT 750DR REMOVING TRANSMISSION FROM VEHICLE
ALLISON TRANSMISSION HT 750DR Draining Transmission
ALLISON TRANSMISSION HT 750DR Disconnecting Controls
ALLISON TRANSMISSION HT 750DR Uncoupling From Driveline And Engine
ALLISON TRANSMISSION HT 750DR Removing Mounting Bolts
ALLISON TRANSMISSION HT 750DR Removing The Transmission
ALLISON TRANSMISSION HT 750DR Removing Input And Output Flange Or Yokes
ALLISON TRANSMISSION HT 750DR Rebuild/Overhaul Instructions

ALLISON TRANSMISSION HT 750DR PREPARING TRANSMISSION FOR INSTALLATION
ALLISON TRANSMISSION HT 750DR Checking Flywheel (Engine-Mounted Models)
ALLISON TRANSMISSION HT 750DR Installing Brake And Output Flange
ALLISON TRANSMISSION HT 750DR Installing Input Flange (Remote-Mounted)
ALLISON TRANSMISSION HT 750DR Installing Range Selector Lever
ALLISON TRANSMISSION HT 750DR Installing PTO (Applicable at Any Location)
ALLISON TRANSMISSION HT 750DR Installing Shift Modulation Control
ALLISON TRANSMISSION HT 750DR Installing Oil Filler Tube

ALLISON TRANSMISSION HT 750DR PREPARING VEHICLE FOR TRANSMISSION INSTALLATION
ALLISON TRANSMISSION HT 750DR Checking Flexplate Drive Assembly
ALLISON TRANSMISSION HT 750DR (Transmission Engine-Mounted)
ALLISON TRANSMISSION HT 750DR Checking Input Drive Components
ALLISON TRANSMISSION HT 750DR (Transmission Remote-Mounted)
ALLISON TRANSMISSION HT 750DR Checking Chassis And Driveline
ALLISON TRANSMISSION HT 750DR Oil Cooler, Oil Filter, And Lines
ALLISON TRANSMISSION HT 750DR Checking Controls

ALLISON TRANSMISSION HT 750DR INSTALLING TRANSMISSION INTO VEHICLE
ALLISON TRANSMISSION HT 750DR Handling
ALLISON TRANSMISSION HT 750DR Mounting To Engine (Transmission Engine-Mounted)
ALLISON TRANSMISSION HT 750DR Installing Transmission Mounting Components
ALLISON TRANSMISSION HT 750DR Rear Support Of The CLBT 750DB
ALLISON TRANSMISSION HT 750DR Coupling To Engine (Transmission Remote-Mounted)
ALLISON TRANSMISSION HT 750DR Coupling To Driveline
ALLISON TRANSMISSION HT 750DR Connecting Cooler And Oil Filter Lines
ALLISON TRANSMISSION HT 750DR Connecting Range Selector Control
ALLISON TRANSMISSION HT 750DR Connecting Hydraulic Retarder Control (CLBT Models)
ALLISON TRANSMISSION HT 750DR Connecting Modulator Control
ALLISON TRANSMISSION HT 750DR Connecting Power Takeoff Controls
ALLISON TRANSMISSION HT 750DR Connecting Parking Brake Controls
ALLISON TRANSMISSION HT 750DR Connecting Output Disconnect Controls
ALLISON TRANSMISSION HT 750DR (Dropbox Models Only)
ALLISON TRANSMISSION HT 750DR Connecting Speedometer Drive
ALLISON TRANSMISSION HT 750DR Installing Temperature And Pressure
ALLISON TRANSMISSION HT 750DR Sensors And Electrical Components
ALLISON TRANSMISSION HT 750DR Filling The Oil System

ALLISON TRANSMISSION HT 750DR OIL SYSTEM
ALLISON TRANSMISSION HT 750DR Filling The System
ALLISON TRANSMISSION HT 750DR Deep Oil Pan
ALLISON TRANSMISSION HT 750DR Oil Pan Interchangeability
ALLISON TRANSMISSION HT 750DR Spare Parts Information
ALLISON TRANSMISSION HT 750DR Installation Of The 81/2 Inch Transmission Oil Pan Assembly and Oil Filler Tube
ALLISON TRANSMISSION HT 750DR Oil Level And Oil Dipstick
ALLISON TRANSMISSION HT 750DR Checking Transmission Oil Level
ALLISON TRANSMISSION HT 750DR Oil Specifications
ALLISON TRANSMISSION HT 750DR Oil Change And Filter Replacement
ALLISON TRANSMISSION HT 750DR Oil Operating Temperatures
ALLISON TRANSMISSION HT 750DR Oil Level For Transfer Gear Housing (Dropbox)

ALLISON TRANSMISSION HT 750DR DUAL MODE OPERATION
ALLISON TRANSMISSION HT 750DR General Description
ALLISON TRANSMISSION HT 750DR Functional Operation
ALLISON TRANSMISSION HT 750DR Installation
ALLISON TRANSMISSION HT 750DR Downshift Inhibiting - CL(B)T 750 (2100 And 2300 rpm Dropbox Models Only)
ALLISON TRANSMISSION HT 750DR CLBT 750 Dual Mode Transmission With Dropbox
ALLISON TRANSMISSION HT 750DR Section VII - RELEASE OF STEP GOVERNOR VALVE BODY ASSEMBLY P/N 23010297
ALLISON TRANSMISSION HT 750DR General
ALLISON TRANSMISSION HT 750DR Interchangeability
ALLISON TRANSMISSION HT 750DR Spare Parts Information

ALLISON TRANSMISSION HT 750DR MANUAL/AUTOMATIC OPERATION ON OIL FIELD EQUIPMENT
ALLISON TRANSMISSION HT 750DR General
ALLISON TRANSMISSION HT 750DR Mannesmann Rexroth Corporation Shifter
ALLISON TRANSMISSION HT 750DR Bennett Shifter
ALLISON TRANSMISSION HT 750DR Preventive Maintenance On Shifters
ALLISON TRANSMISSION HT 750DR Mode Shift Valves Used In Mannesmann Rexroth And
ALLISON TRANSMISSION HT 750DR Bennett Systems

ALLISON TRANSMISSION HT 750DR TROUBLESHOOTING CLBT 750 WITH DUAL MODE
ALLISON TRANSMISSION HT 750DR Pressure Tap Location
ALLISON TRANSMISSION HT 750DR Troubleshooting Dual Mode Circuitry
ALLISON TRANSMISSION HT 750DR Step Governor Valve

ALLISON HT 750DR PREVENTIVE MAINTENANCE MANUAL