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TM 10-3930-643-34
HYDRAULIC SYSTEM TROUBLESHOOTING AND MAINTENANCE. (cont)
12-1.
Hydraulic System Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Before using this procedure, check all hydraulic connections and lines
for damage or external leakage and correct where necessary.
Check the hydraulic hoses for leaks
water solution over length of hoses
fitting is loose, tighten it.
If a
replace it.
and loose fittings. Apply soap and
and observe.
If a hydraulic hose
hose is damaged or defective,
Also check the hydraulic fluid level as described in the Operator’s
Manual TM 10-3930-643-10.
a. ALL IMPLEMENTS FAIL TO OPERATE.
Check hydraulic pump to determine if it is malfunctioning or worn out.
Replace hydraulic pump, refer to paragraph 12-2.
b.
ALL CYLINDER ASSEMBLIES OPERATE SLOWLY.
Step 1.
Check hydraulic pump to determine if it is malfunctioning or
worn.
Replace hydraulic pump, refer to paragraph 12-2.
Step 2. Check loader control valve spools to determine if they are
stuck between galleries, blocking passages, refer to paragraph
12-3.
Test loader control valve per paragraph 12-3. Repair loader control
valve, refer to paragraphs 12-3, 12-4, 12-5, 12-6 and 12-7.
NOTE
This procedure refers to cylinders which are not involved in steering.
For steering system malfunctions, refer to paragraph 9-1.
12-2
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