This is the COMPLETE official full preventive maintenance manual for the ALLISON TRANSMISSION HT 750DR DB .
A preventive maintenance plan will help you stay on top of maintenance, repairs, and parts replacements so you can prevent equipment failure before it ever happens. Preventive maintenance will also keep your operation running smoothly and efficiently, prolong the life of your equipment, and reduce your overall maintenance costs. 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

Tags
ALLISON TRANSMISSION HT 750DR DB REMOVING TRANSMISSION FROM VEHICLE
ALLISON TRANSMISSION HT 750DR DB Draining Transmission
ALLISON TRANSMISSION HT 750DR DB Disconnecting Controls
ALLISON TRANSMISSION HT 750DR DB Uncoupling From Driveline And Engine
ALLISON TRANSMISSION HT 750DR DB Removing Mounting Bolts
ALLISON TRANSMISSION HT 750DR DB Removing The Transmission
ALLISON TRANSMISSION HT 750DR DB Removing Input And Output Flange Or Yokes
ALLISON TRANSMISSION HT 750DR DB Rebuild/Overhaul Instructions

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

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

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

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

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

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

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

Allison Transmission HT 750DR DB Preventive Maintenance