TM-9-2320-260-34-1
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; VOLUME 1 OF 2
JULY 1994
TM-9-2320-260-34-1 - Page 39 of 657
TM 9-2320-260-34-1
Table
2-1.
Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
65. DUMP BODY WILL NOT LOWER
WARNIN G
Overhead lifting device capacity must exceed dump body weight.
A shifting, swinging, or falling load may cause injury to person-
nel. Overhead lifting device must remain attached to dump body
until troubleshooting is completed. Released dump body may fall
and may cause injury to personnel.
All personnel must stand clear of dump body during lowering
test. Falling dump body may cause injury to personnel.
NOTE
Dump body lowering operation should be checked after each
completed troubleshooting check.
Step 1. Apply parking brake (TM 9-2320-260-10).
Step 2. Attach overhead lifting device to dump body with sufficient slack to show slight downward
movement.
Step 3. Check hydraulic lock cylinder hose valve to ensure that each shutoff is open at upper
manifold.
Step 4. Perform troubleshooting malfunction 64, step 2.
Step 5. Check hoist cylinder hoses for restrictions. Clean or replace hydraulic hose(s) if restricted
(para. 15-15).
Step 6. Check control valve lever operation (malfunction 64, step 3).
Step 7. Check control valve for restrictions. Remove and inspect (para. 15-19).
Clean or replace control valve if restricted (para. 15-19).
Step 8. Check hoist cylinders (malfunction 64, step 10). Repair hydraulic cylinders if defective
(para. 15-15). Remove lifting device.
END OF TESTING!
66. DUMP BODY WILL NOT HOLD IN RAISED POSITION
Step 1. Perform troubleshooting malfunction 64, steps 3 through 10.
Step 2. Check hoist cylinders if defective (para. 15-15).
Repair hoist cylinders if defective (para. 15-15).
END OF TESTING!
MEDIUM WRECKER CRANE (M816)
67. CRANE BOOM FAILS TO SWING (OTHER HYDRAULIC SYSTEMS OPERATE SATISFACTORILY)
Step 1. Perform pressure check (TM 9-2320-260-20). Tee test gage into swing motor hydraulic
control line. Operate swing control valve.
a. Proceed to malfunction 68, steps 2 and 3 if pressure is low or erratic.
b. Proceed to step 2 if pressure is steady and sufficient.
2-25
Back to Top
