Toro Groundsmaster 3280-D Service Manual page 346

4-Wheel Drive Rear Axle (continued)
Drive Axles: General Information
The 4-wheel drive rear axle used on the Groundsmaster 3280-D is a steerable,
mechanical drive axle. A driveshaft connected to the front axle output shaft
provides power to the 4-wheel drive rear axle. The driveshaft incorporates a
bi-directional clutch that transfers power from the driveshaft to the 4-wheel drive
rear axle input shaft (Figure
g225899
1. Forward clutch
engagement
Any time the front wheels change speed (e.g., initially pressing the traction
pedal, climbing an incline, and tires slipping), the rear axle driveshaft speed also
changes. As soon as the driveshaft and the rear axle input shaft turn at slightly
different speeds, the bi-directional clutch will engage and power is transferred
to the rear axle (Figure
engages in either forward or reverse direction.
Note: The bi-directional clutch may not operate properly if different size tires are
used or if correct tire pressure is not maintained.
194).
Figure 195
2. Neutral (freewheeling)
195). The result is automatic 4-wheel drive. The clutch
Page 8–4
3. Reverse clutch
engagement
Groundsmaster ® 3280-D/3320
05138SL Rev B