TM 9-2320-260-20
Table 2-2. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
56. VEHICLE ROLLS WHILE OPERATING REAR WINCH
Step 1. Check parking brake for proper adjustment (table 2-3, compressed air and brake
troubleshooting, malfunction 1).
Step 2. Check microbrake lock switch for proper operation (table 2-4, electrical troubleshooting,
malfunction 40).
END OF TESTING!
MEDIUM WRECKER (M816), TRACTOR WRECKER (M819)
57. HYDRAULIC SYSTEM DOES NOT OPERATE
Step 1. Check reservoir oil level.
Fill to proper level if necessary (LO 9-2320-260-12).
Step 2. Check reservoir drainplug and valve for leaks.
a. Close valve.
b. Tighten plug.
Step 3. Check all hydraulic lines for leaks and breaks.
a. Tighten loose fittings.
b. Replace cracked, frayed, or leaking hoses. Notify your supervisor.
Step 4. Inspect hydraulic motor operation.
a. Check hydraulic reservoir for proper oil level (LO 9-2320-260-12).
b. If inoperable, notify your supervisor.
Step 5. Check power divider propeller shafts for breaks.
Replace if broken (para. 13-57, 13-58, or 13-59).
END OF TESTING!
DUMP BODY (M817)
WARNING
When dump body is in raised position, never work under dump
body unless safety braces are properly positioned. Failure to do
so may result in injury to personnel.
58. DUMP BODY WILL NOT RAISE
Step 1. Check hydraulic oil reservoir for proper level.
Fill to proper level if necessary (LO 9-2320-260-12).
Step 2. Check all hydraulic lines and control valve for leaks and damage.
a. Tighten loose fittings.
b. If damaged, notify your supervisor.
Step 3. Inspect pump housing for leaks and overheating with power takeoff engaged.
a. Tighten loose fittings.
b. Replace if overheating, notify your supervisor.
Step 4. Check for proper operation of safety latch.
Place dump control lever in lower position. If safety latch fails to disengage hoist, replace
safety latch (para. 13-25).
END OF TESTING!
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