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 TM 55-1905-223-24-10
Table 2-2. Troubleshooting - Con't
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6.
Hydraulic fluid does not flow.
STEP 1.
Check to see if hydraulic pump is not receiving hydraulic fluid.
a.
Check hydraulic fluid level (PMCS, Item 3).
b.
Clean dirty air breather filter (PMCS, Item 11).
c.
Clean or replace dirty filters and elements (paragraph 2-13).
STEP 2.
Check to see if motor will not operate.
a. Check power supply and electrical wiring connections (PMCS, Item 10).
b. Replace defective electric motor (paragraph 2-14).
STEP 3.
Check to see if electric motor is turning in wrong direction.
Reverse rotation of electric-mot or.
STEP 4.
Check to see if drive coupling is defective.
Replace drive coupling (paragraph 2-14).
STEP 5.
Check to see if hydraulic fluid is passing over pressure relief valve.
a.
Check pressure of pressure relief valve (PMCS, Item 1).
b.
Replace defective pressure relief valve (paragraph 2-13).
STEP 6.
Check for broken piston pump.
Replace piston pump (paragraph 2-15).
7.
System pressure is low.
STEP 1.
Check to see if hydraulic valve pressure is set too low.
Check and reset valve pressu res (PMCS, Item 1).
STEP 2.
Check for external leak in hydraulic system.
Secure connections (PMCS, Item 4).
STEP 3.
Check for worn hydraulic pump.
Replace hydraulic pump (paragraph 2-15).
8.
Noisy hydraulic pump.
STEP 1.
Check for cavitation (vacuums in hydraulic fluid).
a.
Clean or replace dirty air breather filter (PMCS, Item 11).
b.
Clean or replace dirty filters and elements (paragraph 2-13).
2-22
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