TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 880 of 1015
TM 9-2320-272-24-1
3-187. FRONT RELAY VALVE REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INlTlAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
All
TM 9-2320-272-10
TOOLS
TM 9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
EQUIPMENT CONDITION
MATERIALS/PARTS
Parking brake set (TM 9-2320-272-10).
Air reservoirs drained (TM 9-2320-272-10).
Two locknuts (Appendix D, Item 291)
Antiseize tape (Appendix C, Item 72)
GENERAL SAFETY INSTRUCTIONS
Do not disconnect air lines before draining air
reservoirs.
Do not disconnect air lines before draining air reservoirs. Small
parts under pressure may shoot out with high velocity, causing
injury to personnel.
Tag lines and fittings for installation.
Scribe fitting directions for installation.
1.
Disconnect vent lines (4), (9), and (11) from elbow (3) and tee (10).
2.
Disconnect delivery lines (8) and (14) from elbows (7) and (13).
3.
Disconnect control line (12) from elbow (6).
4.
Disconnect supply line (16) from adapter (17).
5.
Remove two locknuts (18), screws (15), and front relay valve (2) from bracket (1). Discard locknuts (18).
6.
Remove elbows (3), (6), (7), and (13), tee (10), and adapters (6) and (17) from front relay valve (2).
Use fittings from old valve.
Wrap all male pipe threads with antiseize tape before
installation.
1.
Install elbows (3), (6), (7), and (13), tee (10), and adapters (6) and (17) on front relay valve (2).
2.
Install front relay valve (2) on bracket (1) with two screws (15) and new locknuts (18).
3.
Connect supply line (16) to adapter (17).
4.
Connect control line (12) to elbow (6).
6.
Connect delivery lines (8) and (14) to elbows (7) and (13).
6.
Connect vent lines (4), (9), and (11) to elbow (3) and tee (10).
3-516
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