TM-9-2320-273-34
TRUCK TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1980
TM-9-2320-273-34 - Page 599 of 801
TM9-2320-273-34
Section V. TRAILER HANDBRAKE VALVE MAINTENANCE
14-18. Description.
The trailer hand brake is normally used to operate the trailer brake independently
of the tractor brakes. The trailer hand brake valve provides the operator with an easily operated and
finely graduated means of applying and releasing the brakes. It is mounted on the right side of the
steering column where the handle can be conveniently reached by the operator. The valve should never
be used to hold the brakes applied when the vehicle is parked unattended.
14-19.
a.
b.
Removal and Disassembly.
Removal. (Refer
to TM 9-2320-273-20).
Disassembly.
(1) Remove two connectors (32, fig. 14-51).
(2) Remove two screws (1) and Iockwashers (2); then lift off designation plate (3).
(3) Pull valve assembly (4) out of body (33). Remove and discard preformed packing (11).
(4) Remove two screws (12) and separate cover (25) from body (33).
(5) Remove spring (16) and gasket (26).
(6) push piston (15) out of body (33); then remove preformed packing (14) from piston
(15).
Discard the preformed packing.
(7) Remove spring (13).
(8) Drive out spiral pin (20); then pull out lever (18) and remove preformed packing
from the lever. Knob (17) may be removed from lever (18) if desired, by pulling and twisting.
(9) Remove cam follower (27) and cam (28).
(10) Remove and discard preformed packing (24).
(11) Remove adjusting ring lockwasher (22) and adjusting ring (23) from cover (25).
(19)
(12) If valve assembly (4) is suspected to be faulty, it can be disassembled for repair by the
following procedure:
(a)
Remove exhaust valve (10).
(b) Disassemble inlet valve (5), valve seat (6), valve stem (7), spring (8) and valve guide
(9).
14-50
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