Kobelco KNW Series, Instruction Manual

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KIMA00H1 (0204) 41
TABLE 6 (cont.) - COMPRESSOR PROBLEM SOLVING
10. Abnormal noise from
compressor element.
1. Coupling problems.
2. Gear trouble
3. Bearing trouble. 1. Inspect and repair coupling.
2. Overhaul.
3. Replace bearings.
11. Abnormal noise from oil pump. 1. Oil level too low.
2. Defective pump.
3. Coupling problems. 1. Raise oil level to maximum.
2. Replace pump.
3. Replace coupling.
12. Abnormal noise from capacity
control valve when loading.
1. Bushings bad in Capacity Control
valve.
2. Solenoid valve trouble.
3. Control tubing leaks.
1. Rebuild valve.
2. Repair or replace.
3. Check tubing and correct faults.
13. Safety valve lifts in normal
operation.
1. Pressure settings too high.
2. Defective pressure transducer.
3. Service valve to plant closed. 1. Set load and unload settings to
proper range for motor horsepower.
2. Replace transducer.
3. Open valve.
14. Oil level rises without adding
oil.
1. Condensation in oil. 1. Change oil.
15. Oil pressure drops during
operation.
1. Oil level too low.
2. Oil filter plugged.
3. Relief valve defective.
4. Oil leak.
5. Oil pump defective.
6. Oil cooler dirty. 1. Add oil to maximum level.
2. Replace filter element.
3. Repair or replace relief valve.
4. Locate and repair leak.
5. Replace pump.
6. Clean cooler (see section 6.5.m).
16. Oil leakage from air vents on
1st or 2nd stage.
1. Gearcase sump breather element
plugged.
2. Oil level too high.
1. Replace breather element.
2. Lower oil level to center of sight
gauge.
17. Oil leakage from vent on motor
adapter.
1. Gearcase sump breather element
plugged.
2. Shaft seal worn.
1. Replace breather element.
2. Replace shaft seal.
18. Unit shuts down for no
apparent reason.
1. Unloading timer timed out
2. Intermittent power outage. 1. Unit designed to shut down if
unloaded for 10 min. Consult
factory.
2. Compressor must be manually
restarted after power is restored.
19. Low capacity. 1. Defective bleed-off valve disc.
2. Defective diaphragm in capacity
control valve.
3. Dirty air inlet filter.
1. Replace disc.
2. Replace diaphragm.
3. Clean or replace element.
20. Compressor back spins on
shutdown.
1. Defective discharge check valve. 1. Repair or replace.
21. Intercooler pressure below
normal.
1. Dirty air inlet filter.
2. Defective 1st stage
3. Defective transmitter. 1. Clean or replace elements.
2. Replace 1st stage
3. Check and replace if necessary.
22. Intercooler pressure above
normal.
1. High 2nd stage inlet temp.
2. Defective 2nd stage. 1. Clean intercooler (see section 6.5.l)
2. Replace 2nd stage.