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 420 of 799
TM 9-2320-272-24-3
4-130. FIFTH WHEEL MAINTENANCE (Contd)
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Remove spring (29) and cotter pin (30) from fifth wheel housing (22) and handle (1). Discard cotter
pin (30).
Remove plunger rack latch (17) and allow plunger rack (18) to slide to unload position.
Remove spring (16) from plunger rack latch (17) and cotter pin (15).
Remove cotter pin (15) from fifth wheel housing (22). Discard cotter pin (15).
Remove safety wire (9), two locknuts (12), washers (13), bracket (14), and plunger rack latch (17)
from stud (21), screw (23), and fifth wheel housing (22). Discard safety wire (9) and locknuts (12).
Remove spring (7), plunger rack (18), screw (23), and spacer (20) from fifth wheel housing (22).
Remove screw (28), lockwasher (27), cam (26), and bushing (25) from fifth wheel housing (22).
Discard lockwasher (27).
Remove locknut (6), washer (5), screw (3), and yoke (4) from pinion gear (19). Discard locknut (6).
Remove handle (1) from fifth wheel housing (22).
Loosen jamnut (2) and remove handle (1) from yoke (4) and jamnut (2) from handle (1).
Remove locknut (8), screw (24), washer (10), spacer (11), and pinion gear (19) from fifth wheel
housing (22). Discard locknut (8).
Remove spring (32) from two coupler jaws (31).
Remove two lubrication fittings (34), screws (35), lockwashers (36), and washers (37) from coupler
jaws (31). Discard lockwashers (36).
Remove two coupler jaws (31), compression arm (33), and two bushings (38) from fifth wheel
housing (22).
WARNING
Personnel must stand clear during release of plunger rack.
Failure to do so may result in injury to personnel.
Eye protection must be worn when removing springs under
tension. Failure to do so may result in injury to personnel.
4-684
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