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 216 of 991
TM 9-2320-272-24-2
3-323. FRONT WINCH AUTOMATIC BRAKE ADJUSTMENT
THIS TASK COVERS:
a. Testing
b. Adjustment
INITIAL SETUP:
APPLICABLE MODELS
All with winch
TOOLS
General mechanic ’s tool kit (Appendix E, Item 1)
PERSONNEL REQUIRED
Two
REFERENCES (TM)
TM 9-2320-272-10
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
GENERAL SAFETY INSTRUCTIONS
l
Wear hand protection when handling winch cable.
l
Never stand between vehicles during test.
l
Assistant must remain in second vehicle to engage
service brakes if cable snaps or winch automatic
brake fails.
l
A minimum of four turns of cable must remain on
winch drive at all times.
NOTE
The procedures for testing and adjustment of front and rear winch
automatic brakes are the same. This procedure covers the front
winch automatic brake. Refer to TM 9-2320-272-10 for winch
operation.
a. Testing
CAUTION
Selection of grade used in this procedure should be within the
tolerance capabilities of the second vehicle. Failure to comply may
result in damage to equipment.
1.
Position test vehicle (1) at top of steep grade, facing downhill, with engine running
(TM 9-2320-272-10).
2.
Position second vehicle (4) at bottom of steep grade, facing uphill, with engine running. Refer to
operator ’s manual for second vehicle (4).
WARNING
l
Never stand between vehicles during test. Assistant must
remain in second vehicle to engage service brakes if cable snaps
or winch automatic brake fails while towing vehicle. Failure to
comply may result in injury to personnel.
l
Wear hand protection when handling winch cable. Broken wires
may cause injury to personnel.
l
A minimum of four turns of cable must remain on winch drum
at all times. Failure to do this may result in injury to personnel
or damage to equipment.
3.
Release winch cable (3) (TM 9-2320-272-10) from test vehicle (1) and rig to second vehicle (4).
4.
Refer to operator ’s manual for second vehicle (4) and prepare vehicle (1) as follows:
a. Place transmission lever (5) in NEUTRAL position.
b. Disengage parking brake (TM 9-2320-272-10).
c. Disengage front wheel drive lever if engaged (TM 9-2320-272-10).
5.
Prepare front winch (2) of vehicle (1) for winding (TM 9-2320-272-10).
3-824
Back to Top
