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 910 of 1015
TM 9-2320-272-24-1
3-199. BRAKE PROPORTIONING VALVE REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
EQUIPMENT CONDITION
MATERIALS/PARTS
Two locknuts (Appendix D, Item 299)
Two tiedown straps (Appendix D, Item 684)
Adhesive sealant (Appendix C, Item 4)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
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Parking brake set (TM 9-2320-272-10).
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Air reservoirs drained (TM 9-2320-272-10).
GENERAL SAFETY INSTRUCTIONS
Do not disconnect air lines before draining air
reservoirs.
a. Removal
WARNING
Do not disconnect air lines before draining air reservoirs. Small
parts under pressure may shoot out with high velocity, causing
injury to personnel.
NOTE
Tag air lines and fittings for installation.
1.
Remove two tiedown straps (8) from air lines (1), (7), and (9). Discard tiedown straps (8).
2.
Disconnect air lines (1), (3), (7), and (9) from elbow (10), adapter (4), elbow (5), and adapter (6).
3.
Remove elbows (10) and (5) and adapters (4) and (6) from brake proportioning valve (2).
4.
Remove two locknuts (11), screws (12), and brake proportioning valve (2) from bracket (13). Discard
locknuts (11).
b. Installation
NOTE
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If new brake proportioning valve is being installed, use
attaching parts and fittings from old brake proportioning valve.
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Fittings must be cleaned and inspected for cracks and stripped
threads.
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Apply adhesive sealant to all male pipe threads before
installation.
1.
Install brake proportioning valve (2) on bracket (13) with two screws (12) and new locknuts (11).
2.
Install elbows (10) and (5) and adapters (4) and (6) on brake proportioning valve (2).
3.
Connect air lines (1), (3), (7), and (9) to elbow (10), adapter (4), elbow (5), and adapter (6).
4.
Install two new tiedown straps (8) on air lines (1), (7), and (9).
3-546
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