Potential Problem Possible Reasons Fix Refer to slippage section. Replace clutch. Reduce reason for the high temperature overloading on the engine. Loosen torque tab to make sure it has freedom of movement both axially and radially. Back off the air gap to the higher end of the air gap range. Change the method of securing the clutch to allow for a greater surface area of contact so force is more spread out and less wear takes place. Check to see if the clutch is discolored to see if it shows signs of slippage. Check for damage to both the outer race and inner race of the bearing. Make sure key is not too tight forcing pressure on the inner race. In the outer race area, check for marks or damage that could have caused the clearances to close up. Check temperature if shaft clutch is mounted on to make sure it is under 149°C / 300°F Check torque tab or backing plate to make sure that there is freedom of movement of 1/16 of an inch axially and radially. Check to see if any marks are evident that would indicate axial forces applied. Brake shroud and air gap set too close. This means that the armature is contacting the brake while the clutch is engaged. In a heavy vibration application, the pin holding the backing plate can become worn because of vibration opening up clearance. This can then generate noise because of the additional movement in the braking plate. Noise from field bearing (Noisy field bearing has failed or is about to fail.) In general purpose and PTO brakes Pinging or scraping * noise noticed when clutch is engaged. Brake plate rattles. * Noisy Clutch continued: Electromagnetic Clutches & Brakes Troubleshooting Guide *PTO Clutch/Brakes Only www.jbj.co.uk/electromagnetic-clutches.html 60 #DriveLineHarmony
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