Potential Problem Possible Reasons Fix Reduce belt load. Reduce the heat or eliminate slippage. Increase air gap. Re-burnish the clutch. Tighten bolts. Remove rotor assembly and reseat keyway. Loosen the bolts, remove wire and retighten field mounting bolts. Loosen set screw, push together, then back off .1”, and retighten setscrew. 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.) Replace the clutch. Check if bearing feels rough. Check belt load to make sure pulley and bearings are not over loaded. 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. Air gap too close. Surface is heavily galled. Possible causes are bolts in field not tightened down properly. Key in keyway not seated properly. This could cause it to cock to one side. Lead wire pinched between mounting face and field bracket cocking field assembly. If set screw version, this could be because of improper air gap between pulley/armature and field. Mounting face not concentric with the shaft. 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. Noise from pulley bearing. Pinging or scraping noise noticed when clutch is disengaged Noise is evident when * the clutch is first installed and rotated by hand. Mounting bracket has * come loose from back of field assembly. *Mobile Clutches Only Noisy Clutch continued: Electromagnetic Clutches & Brakes Troubleshooting Guide www.jbj.co.uk/electromagnetic-clutches.html 59 #DriveLineHarmony
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