www.jbj.co.uk/electromagnetic-clutches.html 16 General Purpose Clutches Installation #DriveLineHarmony cupped; otherwise this could dig into the bearing seal). Please be sure to check the fillet on the ground drive pulley, washer, or clutch so that they do not interfere with the radius on the step in the engine crankshaft. On some of our clutches, the bearing is kept on the inner sleeve via a snap ring (pulley side). With this design, the rotor would then contact the appropriate step on the shaft. For problems during installation or operation, please refer to the troubleshooting section at the back of this publication. If you still have questions, please contact jbj Techniques Ltd technical office for assistance, tel: +44 (0)1737 767493 or email: info@jbj.co.uk 2. A centre bolt and washer (customer-supplied) is then placed into the end of the tapped shaft and tightened down. The washer should be at least ¼” in thickness. Bolt tightening torque will vary depending on the bolt used in the application. This can be anywhere from 20 to 50 ft-lbs. If vibration is heavy, an adhesive may be required to prevent the bolt from becoming loose. The washer should contact the inner race of the bearing. It can extend beyond the inner race as long as it does not contact the outer race. Troubleshooting. 4. In order to get maximum torque, the clutch should be burnished. Burnishing is a procedure where the clutch is cycled 30 to 50 times at half the normal operating speed of the clutch. The cycle rate can be 2 to 6 cycles per minute depending on inertia. Please consult with your local representative to determine max cycle rate. Proper burnishing allows the wear surfaces to mate together to produce maximum torque. However, improper burnishing can damage the surfaces. Please take care to allow enough time between cycles so that the surfaces are not damaged. Contamination. 3.At this point, the torque tab should be held in the appropriate position. Please make sure that there is freedom of movement both axially and radially of about 1/16”. Double check the installation by pushing and pulling against the back of the field to move it slightly from side to side. Under no circumstances should the torque tab be tightened down firmly. This will cause failure of the field bearings. Care should be taken so that contaminants such as oil, grease, etc. do not come in contact with the working faces of the unit. In some cases it may be necessary to provide a cover or baffle to prevent this. Oil and grease on the friction surfaces should be removed by wiping with a small amount of environmentally friendly grease solvent. However, depending on the permeability of the grease or oil, it may be impossible to remove completely, so if the unit shows signs of slippage it needs to be replaced.
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