TM 5-4310-452-14
Table 4-2. Mechanical Troubleshooting Procedures (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. UNIT WILL NOT UNLOAD.
Step 1. Check for blocked regulating valve inlet.
Remove and clean regulating valve (see paragraph 4-94).
Step 2. Check regulating valve adjustment.
Adjust throttle control (see paragraph 4-25).
Step 3. Check for defective blowdown valve.
Replace blowdown valve (see paragraph 4-95).
8. SAFETY RELIEF VALVE RELIEVES.
Step 1. Check to see if safety valve pops off.
Replace oil separator filter element (see paragraph 4-87).
Step 2. Check to see if operating pressure is too high.
Adjust throttle control (see paragraph 4-25).
Replace unloader valve assembly (see paragraph 4-90).
Remove and clean regulating valve (see paragraph 4-94).
Replace safety relief valve (see paragraph 4-96).
9. START PRESSURE TOO HIGH.
Step 1. Check for blocked regulating valve inlet.
Remove and clean regulating valve (see paragraph 4-94).
Step 2. Check for defective blowdown valve.
Replace blowdown valve (see paragraph 4-95).
10. EXCESSIVE VIBRATION.
Step 1. Check for loose fan hub.
Tighten fan hub (see paragraph 4-92).
Step 2. Check for bent or broken fan blades, Replace fan (see paragraph 4-92).
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