MAC TOOLS MW250 Instructions d'exploitation télécharger pdf (Page 81)

100

101

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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MAC TOOLS MW250 Instructions d'exploitation Page 81

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