Step 1

Slide the clutch onto the shaft, (for a two-piece clutch, slide both pieces on one at a time). Please make sure that the key is in the proper location. Do not force the clutch onto the shaft because, if the key is off slightly, damage could occur to the key or to the bore of the clutch. The shaft should extend into the clutch enough to support each component. A standard rule of thumb is the penetration should be at least equal to the diameter of the shaft. The clutch should be slid onto the shaft until the bearing inner race on the clutch contacts a step, washer or other drive pulley. In all cases, the mounting surfaces of these components need to be parallel to each other within .003". If these surfaces are not parallel, the clutch could become cocked on the shaft. (This would show up as a wobbling pulley.) The contact of these components, to the bearing inner race, can extend beyond the inner race because the seal is recessed. (If you are using a washer, make sure it is not cupped; otherwise, this cupping could dig into the bearing seal.) Please be sure to check the chamfer on the ground drive pulley, washer or clutch so 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. (See example below.)

Step 2

A center bolt and washer, (customer supplied) is then placed into the end of the tapped shaft and then tightened down. The washer should be .250" in thickness. Bolt tightening torque will vary depending upon the bolt used in the application. This can be anywhere from 20 -50 ft. lbs. of tightening torque, depending upon the bolt. 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.

Step 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 the torque tab of about 1/16". Double check the installation after it is tightened down, you should be able to push against the back of the field and 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.

Step 4

In order to get maximum torque out of the clutch, burnishing should be performed. Burnishing is a procedure where the clutch is cycled anywhere from 30 - 50 times at half the normal operating speed of the clutch. The cycle rate can be anywhere from 2 - 6 cycles per minute depending upon your inertia. (Please consult with your local representative to determine your maximum 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 in between cycles so that the surfaces are not damaged.