TM 10-3930-641-34-1
HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
23. FLOW LOSS PERCENTAGES ARE 15% OR MORE AT 2000 RPM, BUT FLOW LOSSES ARE LESS THAN 15 GPM AT 700 RPM.
TEE tests 4 thru 7 indicate aeration of oil. (See page 7-133.)
Step 1. Correct air leaks on low side of circuit (suction side of pump).
Step 2. Add oil to hydraulic tank.
Step 3. Change to correct grade of oil.
24. FLOW LOSS PERCENTAGES FOR TESTS 4 AND 5 IS 15% OR MORE; FOR TESTS 6 AND 7 IT IS 0 TO 15%.
TEE tests 4 thru 7. (See page 7-133.)
Step 1. Replace seal in mast cylinder piston.
Step 2. Repair or replace control valve.
25. FLOW LOSS PERCENTAGE FOR TEST 4 IS 15% OR MORE; FOR TESTS 5, 6, AND 7 IT IS 0 TO 15%.
TEE tests 4 thru 7. (See page 7-133.)
Repair or replace lift control valve.
26. FLOW LOSS PERCENTAGE FOR TEST 5 IS 15% OR MORE; FOR TESTS 4, 6, AND 7 IT IS 0 TO 15%.
TEE tests 4 thru 7. (See page 7-133.)
Repair or replace control valve.
27. FLOW LOSS PERCENTAGE FOR TESTS 6 AND 7 IS 15% OR MORE; FOR TESTS 4 AND 5 IT IS 0 TO 15%.
TEE tests 4 thru 7. (See page 7-133.)
Step 1. Replace tilt cylinder piston seals.
Step 2. Repair or replace tilt valve.
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