Carrier 17EX External Gear Troubleshooting Guide, Problem, Possible Cause Ð Item NO.s

Table 13 Ð External Gear Troubleshooting Guide

	PROBLEM		POSSIBLE CAUSE Ð 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 speci®ed 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 ¯exibility and lateral ¯oat.
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 speci®c 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 ¯ow around the gear
		unit.

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