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 TM 55-1905-223-24-16
Table 2-2. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
STEP 2.
Check for air in hydraulic system.
a.
Secure all fittings and connections.
b.
Bleed air from hydraulic system (para. 2-13).
c.
Make sure hydraulic fluid level is at the full mark.
STEP 3. Check for loose drive coupling.
Tighten drive coupling setscrews (Item 8, PMCS Table).
STEP 4. Check for defective hydraulic pump (Item 4, PMCS Table).
Replace hydraulic pump (para.
10. Excessive wear of hydraulic pump parts (para. 2-19).
STEP 1. Check for sustained high pressure operation of system, above 2,900 psi.
Make sure pressure gauge and pressure relief settings are correct.
STEP 2. Check for loose drive coupling.
Tighten drive coupling setscrews (Item 8, PMCS Table).
STEP 3. Check to see if air recirculation is causing chatter in the system.
a. Secure all fittings and connections.
b. Make sure hydraulic fluid level is at the full mark.
STEP 4. Check for contamination in hydraulic fluid.
a. Clean or replace suction strainer or filter (para. 2-17)
b. Change hydraulic fluid (Item 15, PMCS Table).
STEP 5. Check to see if viscosity of the hydraulic fluid is too low.
Make sure you are using the proper hydraulic fluid. Refer to LO 55-1905-223-12.
11. Breakage inside hydraulic pump housing.
STEP 1. Check for excessive hydraulic system pressure.
Make sure hydraulic system pressure levels are correct (para.
STEP 2. Check to see if hydraulic pump seizure is due to low fluid level.
Make sure fluid level is correct (PMCS Item).
12. External hydraulic fluid leakage around hydraulic pump shaft or housing.
STEP 1. Check for defective hydraulic shaftseal or pump shaft.
Repair hydraulic pump (para.
13. External hydraulic fluid leakage around hydraulic motor assembly or housing.
2-20
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