Carrier 17EX Start-Up, Operation And Maintenance Instructions Manual page 93

PROBLEM
Excessive Operating Temperature
Oil Leakage
Gear Wear
Bearing Failure
Unusual Noise
*See table below for probable cause and suggested remedy.
POSSIBLE CAUSE
1. Unit Overload
2. Incorrect Oil Level
3. Wrong Oil Grade
4. Contaminated Oil
5. Clogged Breather
6. Improper Bearing Clearance
7. Improper Coupling Alignment
8. Incorrect Coupling
9. Excessive Operating Speed
10. Torsional or Lateral Vibrations
11. Extreme Repetitive Shocks
12. Improper Lubrication of Bearings
13. Improper Storage or Prolonged Shutdown
14. Excessive Backlash
15. Misalignment of Gears
16. Housing Twisted or Distorted
17. Gear Tooth Wear
18. Open Drains
19. Loosely Bolted Covers
20. Motor Related
21. Excessive Ambient Temperature
Table 13 — External Gear Troubleshooting Guide
Reduce the loading.
Verify that the oil level is correct. Too little or too much oil can cause high
temperature.
Use only the AGMA (American Gear Manufacturers Association) grade oil
as specified for the unit size and ambient temperature.
If oil is oxidized, dirty, or has high sludge content, change the oil.
Clean breather regularly.
Too large or too small bearing clearance. Refer to drawing or contact the
gear manufacturer for correct clearance, checking technique, and toler-
ance. Shafts should turn freely when disconnected from the load.
Disconnect couplings, check spacing between shafts, and check alignment.
Realign as required.
Rigid couplings can cause shaft failure. Replace with a coupling that pro-
vides flexibility and lateral float.
Reduce the speed.
Vibrations can occur through a particular speed range known as the critical
speed. Contact the factory for specific recommendations.
Apply couplings capable of absorbing shocks.
Verify that all bearings are receiving adequate amounts of lubricating oil.
Destructive rusting of bearings and gears will be caused by storage or pro-
longed shutdown in moist ambient temperatures. If rust is found, unit must
be disassembled, inspected, and repaired.
Contact gear manufacturer.
Contact pattern to be a minimum of 80% of face.
Verify proper shimming or stiffness of the foundation.
Contact gear manufacturer.
Tighten drain plugs.
Check all bolted joints and tighten if necessary.
Verify that actual operating conditions are consistent with motor nameplate.
Shield unit from heat source and maintain proper air flow around the gear
unit.
POSSIBLE CAUSE — ITEM NO.s*
1,2,3,4,5,6,7,9,12,18,20,21
1,2,3,4,5,7,9,12,13,18,19,21
1,2,3,4,6,7,8,9,10,11,12,13,14,15,16,18,19,21,22
1,6,7,8,9,10,11,12,15,16,19,20,21
1,2,3,4,6,7,8,9,10,11,12,13,15,16,17,20,21
ACTION
93