TM 10-3930-641-34-1
HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
14. RELIEF VALVE DOES NOT OPEN AT HIGH PRESSURE
Step 1. Check for plugged orifice in relief valve assembly.
Check valve orifice.
Step 2. Check to see if relief valve is installed backwards. (See page 7-44.)
Install relief valve correctly. (See page 7-44.)
Adjust. (See page 7-44.)
15. LEAKAGE OF OIL INSIDE CYLINDER
Step 1. Check piston seals for wear.
Replace. (See repair procedure for cylinder.)
Step 2. Inspect cylinder for damage.
Repair. (See repair procedure for cylinder.)
16. TILT CYLINDER PISTON RODS SHOW WEAR
Check alinement of cylinders.
Aline cylinders. (See page 7-54.)
17. SCRATCHES ON CYLINDER RODS.
Inspect wiper rings for dirt and foreign material.
Clean/replace wiper rings. (See repair procedure for cylinder.)
18. CARGO TOPHANDLER DOES NOT LOCK
Step 1. Inspect hydraulic lines and fittings.
Tighten/replace. (See TM 10-3930-641-20.)
Step 2. Inspect twistlock assemblies.
Repair/replace. (See page 9-24.)
Step 3. Check adjustment of control linkage.
Adjust linkage. (See TM 10-3930-641-20.)
Step 4. Inspect spool for defects.
Replace spool. (See page 7-44.)
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