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