Allison Transmission MT 647

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

Allison Transmission MT 647 Specifications

General

Brand	Allison Transmission
Model	MT 647
Category	Microphone system
Language	English

Summary

WARNINGS, CAUTIONS, AND NOTES

WARNING

Used for procedures that could result in personal injury or loss of life.

CAUTION

Used for procedures that could damage equipment.

NOTE

Highlights essential information for procedures.

RANGE SELECTION - AT 500 SERIES AND AT 1500 SERIES WITH A SECOND NEUTRAL (PARK)

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 - MT 650; MT(B) 653 DR

RANGE SELECTION - HT 750 CR, HT 754 CR, MT(B) 654 CR

D (Drive)

Explains automatic upshifting/downshifting for Drive.

Range 4

Range 3

Use for restricting shifts to lower range or for increased engine braking.

RANGE SELECTION - HT 750 DR, HT 750 DR DB

P (Park)

Description of the Park position for starting the engine.

R (Reverse)

Explanation of Reverse operation and its tractive advantage.

N (Neutral)

Details the Neutral position for stationary PTO operation.

2-5 D

Explains automatic upshifting/downshifting for 2-5 ranges in Drive.

Range 2

Use for vehicle speed control up/down steep grades or undesirable conditions.

Range 1

Creeper range for off-highway, mud, snow for greatest tractive advantage.

DRIVING TIPS

THROTTLE CONTROL

DOWNSHIFT INHIBIT FEATURE

OPERATING IN COLD WEATHER

USING THE ENGINE FOR DOWNHILL BRAKING TO SLOW THE VEHICLE OR EQUIPMENT

USING THE HYDRAULIC RETARDER

CARE AND MAINTENANCE

PERIODIC INSPECTIONS

PREVENT MAJOR PROBLEMS

IMPORTANCE OF PROPER FLUID LEVEL

TRANSMISSION FLUID CHECK PROCEDURE

Cold Check

Procedure for checking transmission fluid level at cold operating temperatures.

Hot Check

Procedure for checking transmission fluid level at hot operating temperatures.

DROPBOX FLUID CHECK PROCEDURE

Procedure for checking fluid level in the dropbox system.

KEEPING FLUID CLEAN

RECOMMENDED AUTOMATIC TRANSMISSION FLUID AND VISCOSITY GRADE - NON-MT 643 R TRANSMISSIONS

RECOMMENDED AUTOMATIC TRANSMISSION FLUID AND VISCOSITY GRADE - MT 643 R TRANSMISSIONS

Table 2. Operating Temperature Requirements for Transmission Fluid

FLUID AND FILTER CHANGE INTERVALS

Table 3. Fluid and Filter Change Intervals

FLUID CONTAMINATION

Coolant Leakage

Procedure for addressing coolant leaks into the transmission system.

Fluid Analysis