Problem
| Action
|
Loose drive gear or pulley
|
Important: Do not back off the crankshaft nut in order to align the cotter pin and the castellated nut. Some compressors do not use castellated nuts. Do not use impact wrenches.
| • | The pulley on the gear must be completely seated and the crankshaft nut must be tight. |
| • | If the compressor crankshaft surface or the keyway is damaged, the drive components are loose. |
| • | If damage to the compressor crankshaft is detected, replace the compressor. |
| • | When installing the drive gear or pulley, torque the crankshaft nut to the appropriate torque specifications. |
|
Excessively worn drive couplings or gears
|
- Inspect drive gear and couplings and engine for excessive wear .
- Replace as necessary.
Non-metallic gears should be replaced when the compressor is changed.
|
Compressor cylinder head or discharge line restrictions
|
- Inspect the compressor discharge port and discharge line for carbon build-up.
- If carbon is detected, check for proper cooling to the compressor.
- Inspect the discharge line for kinks and restrictions.
- Replace discharge line as necessary.
|
Worn or burned out bearings
| Check for proper oil pressure in the compressor.
Specification
| • | The minimum required oil pressure with the engine idling is 103 kPa (15 psi). |
| • | Check for excessive oil temperature. The temperature should not exceed 116°C (240°F). |
|
Faulty compressor
| Replace or repair the compressor after determining none of the preceding installation defects exist.
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