This manual contains Preventive Maintenance procedures for the Allison Transmission HT750.
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 HT750 PREVENTIVE MAINTENANCE MANUAL
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Tags
ALLISON TRANSMISSION HT750 REMOVING TRANSMISSION FROM VEHICLE
ALLISON TRANSMISSION HT750 Draining Transmission
ALLISON TRANSMISSION HT750 Disconnecting Controls
ALLISON TRANSMISSION HT750 Uncoupling From Driveline And Engine
ALLISON TRANSMISSION HT750 Removing Mounting Bolts
ALLISON TRANSMISSION HT750 Removing The Transmission
ALLISON TRANSMISSION HT750 Removing Input And Output Flange Or Yokes
ALLISON TRANSMISSION HT750 Rebuild/Overhaul Instructions

ALLISON TRANSMISSION HT750 PREPARING TRANSMISSION FOR INSTALLATION
ALLISON TRANSMISSION HT750 Checking Flywheel (Engine-Mounted Models)
ALLISON TRANSMISSION HT750 Installing Brake And Output Flange
ALLISON TRANSMISSION HT750 Installing Input Flange (Remote-Mounted)
ALLISON TRANSMISSION HT750 Installing Range Selector Lever
ALLISON TRANSMISSION HT750 Installing PTO (Applicable at Any Location)
ALLISON TRANSMISSION HT750 Installing Shift Modulation Control
ALLISON TRANSMISSION HT750 Installing Oil Filler Tube

ALLISON TRANSMISSION HT750 PREPARING VEHICLE FOR TRANSMISSION INSTALLATION
ALLISON TRANSMISSION HT750 Checking Flexplate Drive Assembly
ALLISON TRANSMISSION HT750 (Transmission Engine-Mounted)
ALLISON TRANSMISSION HT750 Checking Input Drive Components
ALLISON TRANSMISSION HT750 (Transmission Remote-Mounted)
ALLISON TRANSMISSION HT750 Checking Chassis And Driveline
ALLISON TRANSMISSION HT750 Oil Cooler, Oil Filter, And Lines
ALLISON TRANSMISSION HT750 Checking Controls

ALLISON TRANSMISSION HT750 INSTALLING TRANSMISSION INTO VEHICLE
ALLISON TRANSMISSION HT750 Handling
ALLISON TRANSMISSION HT750 Mounting To Engine (Transmission Engine-Mounted)
ALLISON TRANSMISSION HT750 Installing Transmission Mounting Components
ALLISON TRANSMISSION HT750 Rear Support Of The CLBT 750DB
ALLISON TRANSMISSION HT750 Coupling To Engine (Transmission Remote-Mounted)
ALLISON TRANSMISSION HT750 Coupling To Driveline
ALLISON TRANSMISSION HT750 Connecting Cooler And Oil Filter Lines
ALLISON TRANSMISSION HT750 Connecting Range Selector Control
ALLISON TRANSMISSION HT750 Connecting Hydraulic Retarder Control (CLBT Models)
ALLISON TRANSMISSION HT750 Connecting Modulator Control
ALLISON TRANSMISSION HT750 Connecting Power Takeoff Controls
ALLISON TRANSMISSION HT750 Connecting Parking Brake Controls
ALLISON TRANSMISSION HT750 Connecting Output Disconnect Controls
ALLISON TRANSMISSION HT750 (Dropbox Models Only)
ALLISON TRANSMISSION HT750 Connecting Speedometer Drive
ALLISON TRANSMISSION HT750 Installing Temperature And Pressure
ALLISON TRANSMISSION HT750 Sensors And Electrical Components
ALLISON TRANSMISSION HT750 Filling The Oil System

ALLISON TRANSMISSION HT750 OIL SYSTEM
ALLISON TRANSMISSION HT750 Filling The System
ALLISON TRANSMISSION HT750 Deep Oil Pan
ALLISON TRANSMISSION HT750 Oil Pan Interchangeability
ALLISON TRANSMISSION HT750 Spare Parts Information
ALLISON TRANSMISSION HT750 Installation Of The 81/2 Inch Transmission Oil Pan Assembly and Oil Filler Tube
ALLISON TRANSMISSION HT750 Oil Level And Oil Dipstick
ALLISON TRANSMISSION HT750 Checking Transmission Oil Level
ALLISON TRANSMISSION HT750 Oil Specifications
ALLISON TRANSMISSION HT750 Oil Change And Filter Replacement
ALLISON TRANSMISSION HT750 Oil Operating Temperatures
ALLISON TRANSMISSION HT750 Oil Level For Transfer Gear Housing (Dropbox)

ALLISON TRANSMISSION HT750 DUAL MODE OPERATION
ALLISON TRANSMISSION HT750 General Description
ALLISON TRANSMISSION HT750 Functional Operation
ALLISON TRANSMISSION HT750 Installation
ALLISON TRANSMISSION HT750 Downshift Inhibiting - CL(B)T 750 (2100 And 2300 rpm Dropbox Models Only)
ALLISON TRANSMISSION HT750 CLBT 750 Dual Mode Transmission With Dropbox
ALLISON TRANSMISSION HT750 Section VII - RELEASE OF STEP GOVERNOR VALVE BODY ASSEMBLY P/N 23010297
ALLISON TRANSMISSION HT750 General
ALLISON TRANSMISSION HT750 Interchangeability
ALLISON TRANSMISSION HT750 Spare Parts Information

ALLISON TRANSMISSION HT750 MANUAL/AUTOMATIC OPERATION ON OIL FIELD EQUIPMENT
ALLISON TRANSMISSION HT750 General
ALLISON TRANSMISSION HT750 Mannesmann Rexroth Corporation Shifter
ALLISON TRANSMISSION HT750 Bennett Shifter
ALLISON TRANSMISSION HT750 Preventive Maintenance On Shifters
ALLISON TRANSMISSION HT750 Mode Shift Valves Used In Mannesmann Rexroth And
ALLISON TRANSMISSION HT750 Bennett Systems

ALLISON TRANSMISSION HT750 TROUBLESHOOTING CLBT 750 WITH DUAL MODE
ALLISON TRANSMISSION HT750 Pressure Tap Location
ALLISON TRANSMISSION HT750 Troubleshooting Dual Mode Circuitry
ALLISON TRANSMISSION HT750 Step Governor Valve

ALLISON HT750 PREVENTIVE MAINTENANCE MANUAL