TM-9-2320-272-24-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4
JUNE 1998
TM-9-2320-272-24-2 - Page 62 of 991
TM 9-2320-272-24-2
3-235. POWER STEERING PUMP PRESSURE AND RETURN HOSES REPLACEMENT
(SHEPPARD)
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
MATERIALS/PARTS
Two O-rings (Appendix D. Item 437)
Cap and plug set (Appendix C, Item 14)
Antiseize tape (Appendix C, Item 72)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDlTlON
• Parking brake set (TM 9-2320-272-10).
• Steering assist cylinder stone shield removed
(para. 3-231).
GENERAL SAFETY INSTRUCTIONS
Do not start engine when steering hoses are
disconnected.
WARNING
Do not start engine when steering hoses are disconnected.
Pressure may whip hoses, causing injury to personnel.
a. Removal
CAUTION
Cap or plug all openings immediately after disconnecting lines and
hoses to prevent contamination. Failure to do so may result in
steering system damage.
NOTE
• Have container ready to catch hydraulic oil.
• Tag all hydraulic lines and hoses for installation.
1.
Remove nut (5), screw (13), and retaining strap (4) from pump return hose (3) and return tube (6).
2.
Loosen two hose clamps (2) and remove pump return hose (3) from pump nozzle (1) and return tube (6).
3.
Disconnect pump return tube (6) from steering gear adapter (7).
4.
Disconnect pump pressure hose (12) from pump adapter (14) and steering gear adapter elbow (11).
5.
Remove adapter (7) and O-ring (8) from steering gear (9). Discard O-ring (8).
6.
Remove adapter elbow (11) and O-ring (10) from steering gear (9). Discard O-ring (10).
b. Installation
NOTE
• Do not reuse hydraulic oil.
• Remove all cap and plugs prior to removal.
1.
Install new O-ring (10) and steering gear adapter elbow (11) on steering gear (9).
2.
Install new O-ring (8) and steering gear adapter (7) on steering gear (9).
NOTE
Do not slide more than 1 in. (25.4 mm) of return hose onto return
tube.
3.
Install pump return hose (3) on pump nozzle (1) and return tube (6) with two hose clamps (2).
4.
Install pump pressure hose (12) on pump adapter (14) and elbow (11).
5.
Install hose retaining strap (4) on hoses (3) and (6) with screw (13) and nut (5).
3-670
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