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 948 of 1015
TM 9-2320-272-24-1
3-208. AIR COUPLINGS REPLACEMENT
THIS TASK COVERS:
a. Front Air Couplings Removal
d. Front Air Couplings Installation
b. Rear Air Couplings Removal
e. Rear Air Couplings Installation
(M923/A1/A2)
(M923/A1/A2)
c. Rear Air Couplings Removal
f.
Rear Air Couplings Installation
(M929/A1/A2, M931/A1/A2, M934/A1/A2
(M929/A1/A2, M931/A1/A2, M934/A1/A2,
M936/A1/A2)
M936/A1/A2)
INITIAL SETUP:
APPLICABLE MODELS
All
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
GENERAL SAFETY INSTRUCTIONS
Do not disconnect air lines before draining air
reservoirs.
General mechanic’s tool kit (Appendix E, Item 1)
Soft-jawed vise
EQUIPMENT CONDITION
l
Parking brake set (TM 9-2320-272-10).
l
Air reservoirs drained (TM 9-2320-272-10).
l
Right and left splash shields removed
(TM 9-2320-272-10).
Six lockwashers (Appendix D, Item 366)
Twelve locknuts (Appendix D, Item 313)
Antiseize tape (Appendix D, Item 72)
MATERIALS/PARTS
TOOLS
WARNING
Do not disconnect air lines before draining air reservoirs. Small
parts under pressure may shoot out with high velocity, causing
injury to personnel.
a. Front Air Couplings Removal
1.
Remove dummy couplings (1) and (15) and S-hook (12) from air coupling (2) and bracket (5).
Dummy coupling (1) has a built-in check valve.
NOTE
Perform steps 2 and 3 for emergency coupling on left side of
vehicle.
2.
Remove air coupling (2) from pipe nipple (14).
3.
Remove pipe nipple (14) from valve (13).
4.
Disconnect air line (11) from elbow (10).
5.
Disconnect elbow (10) from adapter (4).
6.
Remove nut (9), lockwasher (8), adapter (4), identification plate (6), and bracket (5) from frame rail (7).
Discard lockwasher (8).
7.
Remove adapter (4) from elbow (3).
NOTE
Perform step 8 for service coupling on right side of vehicle.
8.
Remove elbow (3) from air coupling (2).
NOTE
Perform step 9 for emergency coupling on left side of vehicle.
9.
Remove elbow (3) from valve (13).
3-584
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