Adjusting The Cutting Unit Pitch; Servicing The Castor Arm Bushings - Toro 30412 Groundsmaster 4000-D Operator's Manual

5. Secure the height-of-cut chains to the rear of the
cutting unit.
6. Pivot transport latch upward into position and secure
with clevis pin and cotter pin.
Adjusting the Cutting Unit
Pitch
Measuring the Cutting Unit Pitch
Cutting unit pitch is the difference in height-of-cut from
the front of the blade plane to the back of the blade
plane. Toro recommends a blade pitch of 1/4 inch (6
mm). That is the back of the blade plane is 1/4 inch (6
mm) higher than the front.
1. Position the machine on a level surface on the shop
floor.
2. Set the cutting unit to the desired height-of-cut.
3. Rotate 1 blade so that it points straight forward.
4. Using a short ruler, measure from the floor to the
front tip of the blade. Rotate the blade tip to the rear
and measure from the floor to the tip of the blade.
5. Subtract the front dimension from the rear
dimension to calculate the blade pitch.
Adjusting the Front Cutting Unit
1. Loosen the jam nuts on the top or bottom of the
height-of-cut chain U-bolt (Figure 78).
2. Adjust the other set of nuts to raise or lower the rear
of the cutting unit and attain the correct cutting unit
pitch.
3. Tighten the jam nuts.
1. Height-of-cut chain
Adjusting the Side Cutting Units
Service Interval: Every 800 hours
Figure 78
2. U-bolt
1. Remove the tensioning cap from the spindle
shaft and slide the spindle out of the castor arm
(Figure 79). Reposition the shims, as required, to
raise or lower the castor wheel until the cutting unit
has the correct pitch.
2. Install the tensioning cap.
1. Castor wheel
2. Tensioning cap
3. Spacers
Servicing the Castor Arm
Bushings
The castor arms have bushings pressed into the top and
bottom 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
castor spindle is loose inside the bushings, the bushings
are worn and must be replaced.
1. Raise the cutting unit so that the wheels are off of
the floor. Block the cutting unit so that it cannot
accidentally fall.
2. Remove the tensioning cap, spacer(s), and thrust
washer from the top of the castor spindle.
3. Pull the castor spindle out of the mounting tube.
Allow the thrust washer and spacer(s) to remain on
the bottom of the spindle.
52
Figure 79
4. Shims
5. Axle mounting holes