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 TM 55-1905-223-24-10
Table 2-2. Troubleshooting - Con't
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
b.
If valve is leaking, check valve seat for scoring and dirt. Clean or replace valve (p aragraph
c.
If valve spring is broken, replace valve (paragraph 2-13).
STEP 6. Check for free re-circulation of hydraulic fluid to reservoir tank occurring in hydraulic system
due to valve stuck in open position.
Inspect pilot operated check valve and pressure relief valve. Repair or replace defective valves
STEP 7. Check for air leak in suction line, preventing priming, or causing noise and irregular action of
control- circuit.
Repair leak or replace line.
STEP 8. Check to see if hydraulic. fluid viscosity is too heavy to pick up prime (especially in cold
weather).
Use lighter viscosity hydraulic fluid.
STEP 9. Check for wrong direction of hydraulic pump rotation.
Reverse direction rotation by reversing controlling pipes connected to hydraulic pump.
STEP 10. Check for broken shaft or parts inside hydraulic pump.
Replace hydraulic pump (paragraph 2-15).
2.
Low pressure in hydraulic system.
STEP 1. Check to see if pressure relief valve press ure set too low.
Adjust valve pressure (PMCS, Item 1).
STEP 2. Check for excessive external leakage.
a.
Secure connections.
b.
Check hydraulic fluid level (PMCS, Item 3).
STEP 3. Check for worn hydraulic pump.
Replace hydraulic pump (paragraph 2-15).
3.
Erratic pressure in-hydraulic system.
STEP 1. Check for air in hydraulic fluid.
a. Secure connections.
b.
Check hydraulic fluid level (PMCS, Item 3).
STEP 2.
Check for contamination in hydraulic fluid.
a.
Clean or replace dirty elements or filters (paragraph 2-13).
b.
Change hydraulic fluid (PMCS, Item 6).
2-20
Change 1
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