Allison Transmission HT 754CR

Operator’s Manual
AT, MT, HT Series
On-Highway Transmissions
OM1334EN

Allison Transmission HT 754CR Specifications

General

Brand	Allison Transmission
Model	HT 754CR
Category	Microphone system
Language	English

Summary

Warnings, Cautions, and Notes

WARNING

Defines the meaning and purpose of a 'WARNING' in the manual.

CAUTION

Defines the meaning and purpose of a 'CAUTION' in the manual.

A Brief Description of the Allison Automatic

Torque Converter

Explains the components and function of the torque converter.

Lockup Clutch (AT 1500, MT(B) 600, HT 700)

Describes the components and operation of the lockup clutch.

Shift Selectors

Range Selection - AT 500 Series and AT 1500 Series with a Second Neutral (Park)

Range Selection - AT 500 Series and AT 1500 Series with a Second Neutral (Park) (contd)

Range Selection - AT 500 Series and AT 1500 Series without a Second Neutral (Park); MT 640, MT(B) 643, MT 643 R, MT(B) 644, MT 647; HT 740, HT 747

Range Selection - AT 500 Series and AT 1500 Series without a Second Neutral (Park); MT 640, MT(B) 643, MT 643 R, MT(B) 644, MT 647; HT 740, HT 747 (contd)

Range Selection - MT 650; MT(B) 653 DR

Range Selection - MT 650; MT(B) 653 DR (contd)

Range Selection - HT 750 CR, HT 754 CR, MT(B) 654 CR

Range Selection - HT 750 CR, HT 754 CR, MT(B) 654 CR (contd)

Range Selection - HT 750 DR, HT 750 DR DB

Range Selection - HT 750 DR, HT 750 DR DB (contd)

Driving Tips

Operating in Cold Weather

Provides guidance on operating the transmission in cold weather conditions.

Using the Engine for Downhill Braking to Slow the Vehicle or Equipment

Using the Hydraulic Retarder

Explains the use and cautions associated with the hydraulic retarder.

Auxiliary Transmission

Towing or Pushing

Provides crucial safety precautions for towing or pushing the vehicle.

Power Takeoff Operation

Care and Maintenance

Periodic Inspections

Outlines regular checks for the transmission and its components.

Importance of Proper Fluid Level

Explains why maintaining the correct fluid level is critical for transmission operation.

Transmission Fluid Check Procedure

Details the steps for checking transmission fluid levels accurately.

Keeping Fluid Clean

Recommended Automatic Transmission Fluid and Viscosity Grade - Non-MT 643 R Transmissions

Specifies recommended fluids and viscosity grades for non-MT 643R transmissions.

Recommended Automatic Transmission Fluid and Viscosity Grade - MT 643 R Transmissions

Caution: Disregarding minimum fluid temperature limits can result in transmission malfunction or reduced transmission life.

Fluid and Filter Change Intervals

Fluid Contamination

Guides on examining fluid for dirt, coolant, or metal particles during changes.

Auxiliary Filter

Caution: Do Not Install an Auxiliary Filter in the AT 500 R or MT 643 R Primary Cooler Circuit.

Advises against installing an auxiliary filter in specific cooler circuits due to retarder effectiveness.