TM 5-3895-370-14&PTable 5-4. Operator Troubleshooting Procedures - CONT.MalfunctionTest or inspectionCorrective actionHYDRAULIC SYSTEM (CONT)19.HYDRAULIC VARIABLE-SPEED PUMP DOES NOT OPERATE (CONT).NOTE·Ensure tachometer reads between 1750 to 3600 rpm.·Ensure reading is taken from opposi te side supplying power to motor.Step 4. Check variable-speed pump charge pressure.If charge pressure is not a minimum of 100 to 130 psi (689 - 896 kPa), go to step 5.If charge pressure is a minimum of 100 to 130 psi (689 - 896 kPa), go to step 8.Step 5. Inspect filter in hydraulic tank.If filter is clogged, clean or replace filter (para 4-144).If filter is not clogged, go to step 6.Step 6. Inspect hydraulic filter on feed line to variable-speed pump.If filter is clogged, clean or replace filter (para 4-137).If filter is not clogged, go to step 7.Step 7. Check variable-speed pump case pressure with pump in neutral.If case pressure is over 25 psi (172 kPa), replace pump or repair charge relief valve (para 5-37).If case pressure is under 25 psi (172 kPa), replace or repair charge pump (para 5-37).NOTEEnsure transmission is in gear and in the opposite direction.Step 8. Check variable-speed pump system pressure at opposite port.If system pressure is below 4500 to 5000 (31026 - 34474 kPa), replace or repair pump (para5-37).If system pressure is 4500 to 5000 (31026 - 34474 kPa), replace pump or repair check valve(para 5-37).5-18
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