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Potential Problem
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Possible Reason
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Solution
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If clutch is able to move on the shaft.
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Check center bolt and washer to make sure it is tight. If it is
tight, make sure that the shaft is not too long. Clutch shaft
should end before the end of the clutch to allow some deflection
in the center bolt and washer to keep clutch on tightly.
(Example)
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Retighten center bolt or change spacer or shaft length.
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Noise from pulley bearing.
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Check if bearing feels rough. Check belt load to make sure
pulley and bearings are not over loaded.
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Reduce belt load.
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High temperature can be caused by either operating environment or
due to slippage. If slippage, clutch should be discolored. Refer
to slippage section for potential reasons.
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Reduce the heat or eliminate slippage.
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Noise is evident when the clutch is first installed and rotated by hand.
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Possible causes are bolts in field not tightened down properly.
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Tighten bolts.
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Key in keyway not seated properly. This could cause it to cock to one side.
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Remove rotor assembly and reseat keyway.
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Lead wire pinched between mounting face and field bracket cocking field assembly.
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Loosen the bolts, remove wire and retighten field mounting bolts.
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If set screw version, this could be because of improper air gap between pulley/armature and field.
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Loosen set screw, push together, then back off .1", and retighten setscrew.
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Mounting face not concentric with the shaft.
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Re-machine mounting holes or switch mounting face (by switching you will be able to verify if mounting holes on the clutch are the problem or the mounting holes on the face are the problem.)
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Mounting bracket has come loose from back of field assembly.
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Check to see if projection welds are broken. If they are, check to see if rotor strike has occurred. Possible misalignment in combination of belt side load has broken projection welds.
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Replace the clutch.
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