Replacing The Blade Drive Belts; Servicing The Bushings In The Castor Arms; Servicing The Rear Castor Wheel And Bearing - Toro 30722 Groundsmaster 300 Operator's Manual

Replacing the Blade Drive
Belts
1. Lower the cutting unit to the shop floor. Remove the
covers on the top of the cutting unit and set the covers
aside. Loosen the idler pulleys to release the tension on
the belts.
2. Remove the carriage bolts, lock washers, and nuts
holding the gear box in place. Lift the gear box off of
the mounting plate and lay it on top of the cutting unit.
3. Remove the belts from the spindle pulleys.
4. Mount a belt on the lower pulley groove of the left
spindle, slide the belt under the belt idler mount plate,
and install it around the center spindle pulley. Tension
the belt by levering the idler pulley against the belt and
tighten the idler pulley flange nut (Fig. 28).
Figure 28
1. Lower belt idler
5. Place the right spindle belt under the gear box mount
plate and the opposite end on top of the right spindle
pulley. Place the left spindle belt under the gear box
mount plate and the opposite end on top of the left
spindle pulley. Mount the gear box and loop the belts
around the gear box pulley.
6. Feed the right and left spindle belts over the pulleys by
rotating the cutter blades. Tighten the gear box
mounting fasteners.
7. Tension the idler pulleys against both belts. Install the
covers on top of the cutting unit.
Servicing the Bushings in the
Castor Arms
The castor arms have bushings pressed into the top and
bottom portion of the tube and after many hours of
operation, the bushings will wear. To check the bushings,
move the castor fork back and forth and from side-to-side.
If the caster spindle is loose inside the bushings, the
bushings are worn and must be replaced.
2. Flange nut
19
1. Raise the cutting unit and block it so that it cannot
accidentally fall.
2. Remove the tensioning cap and spacers from the top of
the castor spindle.
3. Pull the castor spindle out of the mounting tube. Allow
the spacer(s) and thrust washer to remain on the bottom
of the spindle to ensure the same height-of-cut when the
caster spindle is installed.
4. Insert a pin punch into the top or bottom of the
mounting tube and drive the bushing out of the tube
(Fig. 29). Also drive the other bushing out of the tube.
Clean the inside of the tubes to remove dirt.
Figure 29
5. Apply grease to the inside and outside of the new
bushings. Using a hammer and flat plate, drive the
bushings into the mounting tube.
6. Inspect the castor spindle for wear and replace it if it is
damaged.
7. Push the castor spindle through the bushings and
mounting tube. Slide the spacers onto the spindle.
Install the tensioning cap onto the castor spindle to
retain all parts in place.
Servicing the Rear Castor
Wheel and Bearing
The rear castor wheels rotate on high-quality roller bearings
which are supported by spanner bushings. Even after many
hours of use, provided that the bearing was kept
well-lubricated, bearing wear will be minimal. However,
failure to keep the bearings lubricated will cause rapid
wear. A wobbly castor wheel usually indicates a worn
bearing.
1. Remove the capscrew and locknut holding the castor
wheel and 2 washers between the castor fork (Fig. 30).
2. Pull the spanner bushing out of the wheel hub (Fig. 30).