TM 10-3930-641-34-1
HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM TEE TESTS
19. MAIN RELIEF VALVE SETTING IN TOO HIGH OR TOO LOW.
TEE test no. 1 indicates system pressure is too high or too low.
Reset main relief valve.
20. FLOW LOSS PERCENTAGES ARE 15% OR MORE AT 2000 RPM AND ARE APPROXIMATELY THE SAME AT 700 RPM.
TEE tests 4 thru 7. (See page 7-133.)
Step 1. Clean or repair relief valve.
Step 2. Repair or replace hydraulic pump.
Step 3. Repair cylinders.
Step 4. Repair or replace control valves.
21. FLOW LOSS PERCENTAGES ARE 15% OR MORE AT 2000 RPM AND FLOW LOSSES AT 700 RPM ARE MORE THAN 3 GPM HIGHER THAN AT 2000
RPM.
TEE tests 4 thru 7. (See page 7-133.)
Step 1. Repair or replace pump.
Step 2. Repair or replace control valves.
22. FLOW LOSS PERCENTAGES ARE 15% OR LESS AT 2000 RPM AND THE FLOW LOSSES AT 700 RPM ARE MORE THAN 3 GPM HIGHER THAN AT
2000 RPM
TEE tests 4 thru 7. (See page 7-133.)
Step 1. Repair leaks in the circuit.
Step 2. Repair or replace control valves.
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