Toro 20330 - Low Wheel Walk Power Mower Service Manual page 82

WHEEL PINION CLUTCH
4. Assemble the spring arm and pivot arm as shown in
Figure 138.
C C
D D
A. Pivot arm
B. Friction washer
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 fi rst.
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.
5-6
B B
Fig 138 3428-0028
C. Key
D. Spring arm
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 fi ts
properly into the keyway. This will prevent rotation of
A A
the clip on the output shaft.
10. Place the friction ring into the groove on the pivot
arm, fl at 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 fl at 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
WPM Drive Systems Manual