TM 10-3930-641-34-1
HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
28. FLOW LOSS PERCENTAGE FOR TEST 6 IS 15% OR MORE; FOR TESTS 4, 5, AND 7 IT IS 0 TO 15%.
TEE tests 4 thru 7. (See page 7-133.)
Step 1. Repair or replace tilt valve.
Step 2. Tighten piston rod nuts.
29. FLOW LOSS PERCENTAGE FOR TEST 7 IS 15% OR MORE; FOR TESTS 4, 5, AND 6 IT IS 0 TO 15%.
TEE tests 4 thru 7. (See page 7-133.)
Repair or replace tilt valve.
30. FLOW LOSS PERCENTAGE FOR TEST 12 IS 10% OR MORE; FOR TESTS 4 THRU 7 IT IS 15% OR MORE.
TEE tests 12 and 4 thru 7. (See page 7-133.)
Repair or replace hydraulic pump. (See page 7-5.)
31. FLOW LOSS PERCENTAGE FOR TEST 12 IS 0 TO 10%; FOR TESTS 4 THRU 7 IT IS 15% OR MORE
TEE tests 12, and 4 thru 7. (See page 7-133.)
Step 1. Repair or replace control valve.
Step 2. Repair or replace cylinders.
32. FLOW LOSS PERCENTAGE FOR TEST 12 IS 10% OR MORE. FLOW DIFFERENTIAL FOR TEST 12 IS HIGHER THAN TEST DIFFERENTIAL FOR TEST
14 BY MORE THAN 0 GPM.
TEE tests 12 and 14 indicate aeration of oil, or pump cavitation.
Step 1. Find source of air leak in low side of system, (pump suction).
Step 2. Fill the hydraulic tank to the correct level.
Step 3. Drain and fill the system with the correct oil.
Step 4. Remove restrictions from the pump suction line.
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