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 TM 55-1905-219-14-3
Table 3-85. Steering Cub Hydraulic Pump - Troubleshooting.
(Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Steering System Inoperative (Cont).
Step 6.
Check for pump shaft that is turning too slowly to prime itself.
Check speed and power to motor.
Step 7.
Check for broken pump shaft or rotor.
Refer to Direct Support Maintenance.
Step 8.
Check for jammed directional control valve.
Refer to table 3-86.
4. System operates sluggishly.
Step 1.
Pump relief valve setting not high enough.
Adjust. Refer to Direct Support Maintenance.
Step 2.
Check for pump relief valve sticking open.
Refer to Direct Support Maintenance.
Step 3. Inspect for leak in hydraulic control system cylinders or valves.
Must be tested independently by blocking of circuit
progressively.
5. Pump making noise.
Step 1.
Check for partially clogged intake line or restricted intake pipe.
Refer to Direct Support Maintenance.
Step 2. Check for small air leak at pump intake piping joints or at pump shaft seal.
Test by pouring oil on joints or around shaft while listening for
change in sound of operation; tighten as required. If problem
continues, replace the pump. Refer to paragraph 3-206.
3-240
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