7. UNIT WILL NOT UNLOAD.

Table 4-3. Electrical Troubleshooting Procedures

TM-5-4310-452-14 Compressor Air: Rotary Screw 750 CFM 100 PSI Wheel-Mounted DED SULLIAR Model 750 DP Manual
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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). 4-14

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