TM-9-2320-272-24-4

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

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

JUNE 1998

TM-9-2320-272-24-4 - Page 310 of 836

TM 9-2320-272-24-4

5-43. MODULATE LOCKUP VALVE, LOW TRIMMER VALVE, AND LOW SHIFT VALVE

REPLACEMENT

THIS TASK COVERS:

a. Removal

b. Installation

INITIAL SETUP:

APPLICABLE MODELS

All

REFERENCES (TM)

TM 9-2320-272-24P

TOOLS

EQUIPMENT CONDITION

General mechanic’s tool kit (Appendix E, Item 1)

Transmission oil pan and filter removed (para. 5-42).

Torque wrench (Appendix E, Item 146)

SPECIAL ENVIRONMENTAL CONDITIONS

Work area clean and free from blowing dirt and dust.

1.

Remove three screws (5) and modulated lockup valve (6) from oil transfer plate (4).

2.

Remove six screws (1) and low trimmer valve (2) from low shift valve (3).

3.

Remove two screws (7) and low shift valve (3) from oil transfer plate (4).

NOTE

Keep oil pan mounting surface in horizontal position and facing

upward.

1.

Install low shift valve (3) on oil transfer plate (4) with two screws (7). Finger-tighten screws (7).

2.

Install low trimmer valve (2) on low shift valve (3) with six screws (1). Tighten screws (1) and (7)

9-11 lb-ft (12-15 N•m) in sequence shown.

3.

Install modulated lockup valve (6) on oil transfer plate (4) with three screws (5). Tighten screws (5)

9-11 lb-ft (12-15 N•m) in sequence shown.

5-304