TM 9-2320-272-24-2
3-454. PNEUMATIC CONTROLLER AND RELIEF VALVE MAINTENANCE
THIS TASK COVERS:
d. Assembly
a. Removal
e. Installation
b. Disassembly
c. Cleaning and Inspection
INITIAL SETUP:
EQUIPMENT CONDITION
APPLICABLE MODELS
Air reservoirs drained ( TM 9-2320-272-10).
M939A2
q
Pressure transducer removed (para. 3-453).
q
TOOLS
GENERAL SAFETY INSTRUCTIONS
General mechanic's tool kit (Appendix E, Item 1)
When cleaning with compressed air, wear eyeshields
Multimeter (Appendix E, Item 86)
and ensure source pressure does not exceed 30 psi
MATERIALS/PARTS
(207 kPa).
Relief valve kit (Appendix D, Item 531)
Petrolatum (Appendix C, Item 53)
Antiseize tape (Appendix C, Item 72)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
a. Removal
Disconnect connector (11) from solenoid receptacle (10).
1.
2.
Disconnect air lines (5) and (7) from elbows (4) and (8).
3.
Remove relief valve (6) and elbows (4) and (8) from pneumatic controller (9).
4.
Remove four screws (3), pneumatic controller (9), and two spacers (2) from mounting plate (13).
5.
Remove three screws (1) and mounting plate (13) from cab floor (12).
b. Disassemble
Remove nut (21) from solenoid receptacle (10), and remove six screws (20), solenoid protector (19),
1.
and gasket (17) from cover plate (15). Discard solenoid protector (19) and gasket (17).
NOTE
Mark wiring harnesses to correspond to C, D, and S marks on
base plate.
2.
Remove three nuts (18), wiring harness (22), three gaskets (23), and seats (24) from studs (25) on
cover plate (15).
3.
Remove six screws (27) and base plate (26) from valve body (14).
4.
Remove four screws (16) and cover plate (15) from valve body (14).
NOTE
Mark location and position of valve cartridges for installation.
5.
Using access through orifice passages (32), carefully pry out valve cartridge (28) and two valve
cartridges (29) from valve body ports (31). Discard valve cartridges (28) and (29).
6.
Remove three O-rings (30) and five O-rings (33) from valve body (14). Discard O-rings (30) and (33).
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