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 882 of 1015
TM 9-2320-272-24-l
3-188. REAR RELAY VALVE REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
All
TOOLS
Two locknuts (Appendix D, Item 291)
Antiseize tape (Appendix C, Item 72)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
Air reservoirs drained (TM 9-2320-272-10).
General mechanic’s tool kit (Appendix E, Item 1)
MATERIALS/PARTS
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 (3) and (11) from elbows (2) and (12).
2.
Disconnect delivery lines (8) and (15) from elbows (7).
3.
Disconnect supply line (6) from adapter (5).
4.
Disconnect control line (13) from elbow (10).
5.
Remove two locknuts (17), screws (16), and rear relay valve (4) from bracket (1). Discard locknuts (17).
6.
Remove elbows (2), (7), (10), and (12), and adapters (5), (9), and (14) from rear relay valve (4).
Wrap all male pipe threads with antiseize tape before
installation.
1.
Install elbows (2), (7), (10), and (12), and adapters (5), (9), and (14) on rear relay valve (4).
2.
Install front relay valve (4) on bracket (1) with two screws (16) and new locknuts (17).
3.
Connect supply line (6) to adapter (5).
4.
Connect control line (13) to elbow (10).
5.
Connect delivery lines (8) and (15) to elbows (7).
6.
Connect vent lines (3) and (11) to elbows (2) and (12).
Use fittings from old valve.
3-518
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