TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 599 of 1207
TM 9-2320-361-20
8-10. HYDRAULIC MASTER CYLINDER REPLACEMENT
This task covers:
a. Internal Leakage Test
c. Installation
b. Removal
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
All
LO 9-2320-209-12-1
MATERIALS/PARTS
Cotter pin
Two gaskets
Four lockwashers
Screw-assembled lockwasher
Antiseize tape (Appendix C, Item 27)
Cap and plug set (Appendix C, Item 8)
Plug P/N 218-5154
Brake fluid (Appendix C, Item 7)
PERSONNEL REQUIRED
Two
TM 9-2320-361-10
TM 9-2320-361-20P
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-361-10).
Adjust brake pedal (para. 8-14).
Hydraulic hoist pump propeller shaft (M342A2)
removed (para. 12-14).
Hydraulic hoist pump control linkage (M342A2)
removed (para. 13-22).
Transmission PTO shift linkage (M342A2)
removed (para. 13-20).
CAUTION
When disconnecting hydraulic lines and hoses, plug all openings to
prevent dirt from entering and causing internal parts damage.
Remove caps and plugs prior to installation.
I
a. Internal Leakage Test
I
1.
2.
3.
Remove screw-assembled lockwasher (6) from brace (2) and open access door (1). Discard screw-
assembled lockwasher (6).
Disconnect line (3) from adapter (5).
Remove two screws (8) and shield (9) from air-hydraulic cylinder (7).
4.
5.
6.
7.
8.
9.
Have drainage container ready to catch brake fluid.
Remove line (10) and two gaskets (11) from adapter (12) and adapter (13). Discard gaskets (11).
NOTE
Have plug ready to replace adapter before removing adapter.
Remove adapter (12) from master cylinder (4) and quickly install plug (14).
Make sure master cylinder (4) is filled with brake fluid 0.5 in. (12.7 mm) from top (refer to
LO 9-2320-209-12-1).
NOTE
Assistant will help with steps 7 and 8.
Measuring distance alongside of brake pedal (15), step down slowly but firmly on brake pedal (15).
Maintain steady firm pressure for 30 seconds.
Brake pedal (15) should not move more than 0.125-0.25 in. (3.18 -6.35 mm).
If brake pedal (15) moves more than 0.125-0.25 in. (3.18 -6.35 mm) in 30 seconds. there is an
internal leak. Replace master cylinder (4).
8-26
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