TM-9-2320-272-24-3

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4

JUNE 1998

TM-9-2320-272-24-3 - Page 201 of 799

TM 9-2320-272-24-3

Section VII. TRANSMISSION MAINTENANCE

4-69. TRANSMISSION MAINTENANCE INDEX

PARA.

NO.

TITLE

PAGE

NO.

4-70.

General

4-465

4-71.

Transmission Replacement (In-Vehicle)

4-466

4-72.

Transmission Replacement (Out-of-Vehicle)

4-476

4-73.

Transmission Select Lever Replacement

4-482

4-74.

Transmission Shift Tower Replacement

4-484

4-75.

Transmission Shift Cable Maintenance

4-486

4-76.

Transmission Selector Shaft Oil Seal Replacement

4-489

4-77.

Transmission Mount Bushing Replacement

4-492

4-78.

Transmission Output Shaft Yoke and Oil Seal Replacement

4-494

4-79.

Transmission Lubrication Valve Replacement

4-496

4-80.

Transmission Fifth Gear Lock-In Solenoid Replacement

4-500

4-70. GENERAL

a.

M939, M939A1, and M939A2 series vehicles utilize one of two Allison MT654CR model automatic

transmissions. Early model (part number 6885292) and later model (part number 23040127) transmissions

are easily identified by the part number on the equipment data plate located on the lower right rear of the

transmission housing. The major differences between models is that later models use a larger oil pump and

a different converter hub. Both models are interchangeable, replaced, and maintained the same way for all

series vehicles. Some internal components are not interchangeable and are noted in the procedures.

4-465