TM-9-2320-272-24-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4
JUNE 1998
TM-9-2320-272-24-3 - Page 410 of 799
TM 9-2320-272-24-3
4-127. POWER STEERING PUMP (M939A2) REPAIR
THIS TASK COVERS:
a. Disassembly
c. Assembly
b. Cleaning and Inspection
INITIAL SETUP:
APPLICABLE MODELS
M939A2
REFERENCES (TM)
LO 9-2320-272-12
TOOLS
TM 9-2320-272-10
TM 9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
MATERIALS/PARTS
Cover kit (Appendix D, Item 86)
Filter element kit (Appendix D, Item 123)
Flange gasket (Appendix D, Item 210)
EQUIPMENT CONDITION
Power steering pump removed (para. 3-236)
GENERAL SAFETY INSTRUCTIONS
Power steering parts kit (Appendix D, Item 523)
Pumping element kit (Appendix D. Item 525)
Lubricating oil (Appendix C, Item 49)
Petrolatum (Appendix C, Item 53)
Drycleaning solvent (Appendix C, Item 71)
When cleaning with compressed air, wear
eyeshields and ensure source pressure will
not exceed 30 psi (207 kPa).
Drycleaning solvent is flammable and toxic.
Keep fire extinguisher nearby when using
drycleaning solvent.
Use eyeshields when removing steering pump
reservoir cover.
Use eyeshields when removing valve cap.
a. Disassembly
1.
Remove screw (7), vent cover (6), and vent filter (5) from cover (4).
WARNING
Power steering pump reservoir cover is spring-compressed. Use
eyeshields when removing. Failure to do so may result in injury to
personnel.
2.
Remove wingnut (1), washer (2), stud gasket (3), cover (4), and cover gasket (8). Discard stud
gasket (3) and cover gasket (8).
3.
Remove spring (9), filter cap (10), and filter (11) from reservoir (23). Discard filter cap (10) and
filter (11).
4.
Remove O-ring (20) and stud (12) from intake fitting (19). Discard O-ring (20).
5.
Remove intake fitting (19) from reservoir plate (18).
6.
Remove two screws (21), lockwashers (22), reservoir plate (18), reservoir (23), two reservoir screw
gaskets (24), and intake gaskets (17) from pump body (16). Discard lockwashers (22) and gaskets (17)
and (24).
7.
Remove elbow (32) and O-ring (33) from pump body (16). Discard O-ring (33).
8.
Remove outlet fitting (30) and O-ring (31) from pump cover (25). Discard O-ring (31).
WARNING
Valve cap is spring-compressed. Use eyeshields when removing.
Failure to do so may result in injury to personnel.
9.
Remove valve cap (29), O-ring (28), spring (27), and valve (26) from pump cover (25). Discard
O-ring (28).
10.
Remove three screws (13), flange (14), and flange gasket (15) from pump body (16). Discard flange
gasket (15).
4-674
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