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 974 of 1015
3-216. DOUBLECHECK
TM 9-2320-272-24-1
THIS TASK COVERS:
a. Removal
b. Installation
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).
Five locknuts (Appendix D, Item 299)
Eight lockwashers (Appendix D, Item 354)
Tiedown strap (Appendix D, Item 694)
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.
NOTE
Tag air lines for installation.
1.
Remove locknut (4), screw (3), and clamp (5) from front step brace (1). Discard locknut (4)
2.
Remove and discard tiedown strap (2).
3.
Remove eight screws (6), lockwashers (24), and access box cover (22) from step box access
Discard lockwashers (24).
4.
Disconnect air lines (14), (15), and (16) from doublecheck valve No. 4 (18).
5.
Disconnect air lines (9), (13), and (14) from doublecheck valve No. 3 (21).
6.
Disconnect air lines (10), (12), and (13) from quick-release valve (7).
(17).
7.
Remove locknut (19), washer (20), screw (23), and doublecheck valve No. 4 (18) from access box
cover (22). Discard locknut (19).
8.
Remove locknut (19), washer (20), screw (23), and doublecheck valve No. 3 (21) from access box
cover (22). Discard locknut (19).
9.
Remove two locknuts (19), screws (23), and quick-release valve (7) from access box cover (22).
Discard locknuts (19).
NOTE
Position valves in soft-jawed vise to remove fittings.
10.
Remove two fittings (8) and fitting (5) from doublecheck valve No. 4 (18).
11.
Remove two fittings (8) and fitting (11) from doublecheck valve No. 3 (21).
12.
Remove three fittings (8) from quick-release valve (7).
3-610
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