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 764 of 799
TM 9-2320-272-24-3
4-226. DEEPWATER FORDING PRESSURIZATION VALVE REPLACEMENT
THIS TASK COVERS
a. Removal (M9389/A1)
c. Installation (M939A2)
b. Removal (M939A2)
b. Installation (M939/A1)
INITIAL SETUP:
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
MATERIALS/PARTS
Two
locknuts (M939/Al) (Appendix D. Item 283)
Locknut (M939/Al) Appendix D, Item 318)
Lockwasher (M939/Al) (Appendix D, Item 354)
Antiseize tape (Appendix C, Item 72)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
Hood raised and secured (TM 9-2320-272-10).
Air reservoirs drained (TM 9-2320-272-10).
Air pressure hose removed from valve (M939A2)
(para. 4-227).
GENERAL SAFETY INSTRUCTIONS
Do not disconnect air lines before draining air
reservoir.
WARNING
Do not disconnect air lines before draining air reservoirs. Small
parts under pressure may shoot out with high velocity causing
injury to personnel.
1.
Remove two locknuts (25), screws (18), and clamp (19) from fording cable bracket (24). Discard
locknuts (25).
2.
Loosen screw (29) and remove control cable (26) from nut (28).
3.
Disconnect supply hose (20) from pressurized valve adaptor (21).
NOTE
Perform step 4 for vehicles equipped with positive crankcase
ventilation system.
4.
5.
6.
7.
8.
9.
10.
Remove two clamps (33), hose (35), and crankcase vent tube (32) from pressurization valve elbow (34).
Remove two clamps (16), hose (17), and crankcase breather tube (15) from pressurization valve
elbow (27).
Disconnect pressurization hose (6) and vent hose (5) from pressurization valve connectors (7).
Remove locknut (a), screw (12), clamp (ll), and power steering pump hose (13) from bracket (9) on
radiator support bracket (10). Discard locknut (8).
Disconnect power steering pump hose (13) from pressurization valve connector (14).
Remove two clamps (1) and hose (2) from crankcase breather (3) and pressurization valve (22).
Remove screw (30), lockwasher (31), and pressurization valve (22) with bracket (23) from rocker
lever cover (4). Discard lockwasher (3 1).
NOTE
Tag all hoses and lines for installation.
4-1028
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