Toro 20330 Service Manual - Page 82

WHEEL PINION CLUTCH 4. Assemble the spring arm and pivot arm as shown in Figure 138. A C B D A. Pivot arm B. Friction washer Fig 138 C. Key D. Spring arm 3428-0028 5. To increase service life, make sure all parts are clean prior to assembly and coated with new grease. 6. If removed, install a new O-ring in the innermost groove 2-1/4" (5.7cm) in from the end on each output shaft, making sure that it is fully seated in the groove. Refer to Figure 000 (3428-0028) above. Not all models use an O-ring. 7. Slip the end cap onto the output shaft, but do not fasten at this time. 8. Slide the pivot arm and spring arm assembly onto the output shaft, boss first. Note: The convex side of the spring arm rivet and the concave side of the knob on the spring arm should both be facing the housing. 9. Slide the externally tabbed thrust washer and the internally tabbed thrust washer onto the output shaft. Make sure that the tab on the internally tabbed thrust washer enters the keyway. Secure with the special retaining clip. Make sure that the center tab fits properly into the keyway. This will prevent rotation of the clip on the output shaft. 10. Place the friction ring into the groove on the pivot arm, flat side out. 11. Slide the clutch washer onto the shaft so that the recesses for the key are facing out. 12. Place the wheel pinion key in the groove on the output shaft with the leg toward the clutch washer. Note: There is a left and a right wheel pinion key. You are using the correct key if, when placed in the groove, the top of the key is flat and the straight portion of the leg is perpendicular to the shaft. Before assembling further, rotate the clutch washer back and forth slightly, making sure that the key actuates properly (Fig. 139). Fig 139 3428-0028 5-6 WPM Drive Systems Manual