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Installation SecretsServo Clutch Adjustment Technique by Butch Nimmo, Tech Rep From time to time we hear from dealers that are experiencing difficulty maintaining the desired torque setting while lining up the hole in the capstan drive shaft with the castellation in the adjustment nut.
This seems to be more of a problem with clutch settings above 35 in. lbs., that also require combinations of tension washers which contain at least three each of the .040 inch thick washers (PN 1253-1), or a combination of .040 & .032 inch thick totaling four washers. The components that make up the clutch mechanism (see Figure1) must all seat together properly and completely, to facilitate installation of the cotter pin through the castellated nut and capstan drive shaft.
 Figure 1 As you can see in Figure 1, the clutch assembly is comprised of a bottom roll pin through the shaft, bottom clutch plate, three delrin clutch discs, the capstan itself, three more delrin clutch discs, top clutch plate, roll pin, at least 3 tension washers and a flat washer. The two roll pins must fully engage the clutch plates and the tension washers must "nest" together correctly to achieve the desired clutch setting and to allow the proper installation of the cotter pin per the appropriate installation instructions. The best technique is to torque the clutch to the specified torque, and then continue to increase the torque, stopping before any deformation of the tension washer has occurred. Then simply back off to the desired clutch torque setting and insert the cotter pin. |