TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 139 of 1015
TM 9-2320-272-24-1
Table 2-1. Unit Preventive Maintenance Checks and Services (Contd).
NOT FULLY
PROCEDURE
MISSION
CAPABLE IF:
54
Annual
Special
c.
On M936/A1/A2 model vehicles:
body items
(Contd)
WARNING
• Do not drain oil from wrecker hydraulic pump,
reservoir, cylinders, or motors, or remove lines
containing oil when oil is hot. Doing so may result
in injury to personnel.
• Do not remove hoist or winch hydraulic hoses
when engine is running or start engine with hoist
or winch hydraulic hoses removed. High pressure
fluids may cause hoses to whip violently and spray
randomly. Failure to do so may result in injury to
personnel.
• Do not drain oil from wrecker hydraulic pump,
reservoir, or cylinders or remove lines containing
oil when crane boom is supported by hydraulic
cylinder, or hoist or winch cables are supporting a
load. Doing so may result in injury to personnel.
• Accidental or intentional introduction of liquid
contaminants into the environment is in violation
of state, federal, and military regulations. Refer to
Army POL (para. 1-8) for information concerning
storage, use, and disposal of these liquids. Failure
to do so may result in injury or death.
1.
Inspect rear winch and winch controls for loose
mounting and broken or missing parts. If mounting is loose,
tighten. If parts are missing or broken, replace (para. 3-332).
2.
Inspect hydraulic pump for leaks. If leaks are
present, notify DS maintenance.
3.
Test automatic hoist drum brake for proper
operation (para. 3-323).
4.
With boom raised, inspect crane cylinder piston
rods for bends and scoring. If crane cylinder piston rods are
bent or scored, notify DS maintenance.
5.
While operating crane, observe that fuel pump
governor is maintaining 1,250-1,300 rpm during hoisting
operation. Notify DS maintenance if engine is surging
erratically (TM 9-2320-272-10).
6.
Inspect and clean hydraulic tank swing motor and
hoist crane motor breather caps (para. 2-15).
7.
Inspect reservoir filter case for leaks. Replace filter
element (para. 3-336).
8.
Drain, clean, and fill hydraulic oil reservoir every
12 months (LO 9-2320-272-12).
2-51
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