TM 5-3895-370-14&P
Table 5-4. Operator Troubleshooting Procedures - CONT.
Malfunction
Test or inspection
Corrective action
HYDRAULIC 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).
NOTE
Ensure 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 (para
5-37).
If system pressure is 4500 to 5000 (31026 - 34474 kPa), replace pump or repair check valve
(para 5-37).
5-18
