TM 9-2320-272-24-2
3-455. RELIEF SAFETY VALVE MAINTENANCE
THIS TASK COVERS:
d. Assembly
a. Removal
e. Installation
b. Disassembly
c. Cleaning and Inspection
INITIAL SETUP:
REFERENCES (TM)
APPLICABLE MODELS
TM 9-2320-272-10
M939A2
TM 9-2320-272-24P
TOOLS
EQUIPMENT CONDITION
General mechanic's tool kit (Appendix E, Item 1)
Parking brake set (TM 9-2320-272-10).
q
MATERIALS/PARTS
Air resevoirs drained (TM 9-2320-272-10).
q
O-ring (Appendix D, Item 488)
GENERAL SAFETY INSTRUCTIONS
Two sleeves (Appendix D, Item 656)
Eyeshields must be worn when releasing
Two sleeves (Appendix D, Item 655)
Cap and plug set (Appendix C, Item 14)
compressed air.
Antiseize tape (Appendix C, Item 72)
WARNING
Air pressure may create airborne debris. Use eye protection, or
injury to personnel may result.
NOTE
q There are three relief safety valves, one for each axle. Relief
safety valves are mounted the same and perform the same
function. This procedure covers maintenance of one relief valve.
q When removing air lines, plug ends and tag for installation.
q Perform steps 1 and 2 for front axle relief safety valve.
Disconnect air lines (22), (23), and (29) from connectors (30) and (28) and elbow (26).
1.
Remove sleeve (24), elbow (26), connectors (30) and (28), and reducers (25) and (27) from relief
2.
safety valve (9). Discard sleeve (24).
NOTE
Perform steps 3 and 4 for forward-rear axle relief safety valve.
Disconnect air lines (12), (16), (21), and (19) from tee (14) and elbows (11) and (18).
3.
Remove sleeves (13) and (15), tee (14), elbows (11) and (18), and reducers (20) and (17) from relief
4.
safety valve (9). Discard sleeves (13) and (15).
NOTE
Perform steps 5 and 6 for rear-rear axle relief safety valve.
Disconnect air lines (10), (5), and (8) from elbows (1), (3), and (7).
5.
Remove sleeve (4), elbows (1), (7), and (3), and reducers (2) and (6) from relief safety
6.
valve (9). Discard sleeve (4).
Remove two nuts (34), washers (33), screws (31), washers (32), and relief safety valve (9) from
7.
bracket (39).
Remove nut (41), washer (40), screw (37), washer (36), and bracket (39) from frame (38). Remove
8.
spacer (35) (M936A2 vehicles only).
3-1240
