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Adjusting the Mower-Deck
Pitch
Measuring the Mower-Deck Pitch
Mower-deck pitch is the difference in height of cut from the
front of the blade plane to the back of the blade plane. Use s
a blade pitch of 8 to 11 mm (5/16 to 7/16 inch). That is the
back of the blade plane is 8 to 11 mm (5/16 to 7/16 inch)
higher than the front.
1. Position the machine on a level surface on the shop
floor.
2. Set the mower deck to the desired height of cut.
3. Rotate a blade to point straight forward.
4. Using a short ruler, measure from the floor to the front
tip of the blade.
5. Rotate the blade tip to the rear and measure from the
floor to the tip of the blade.
6. Subtract the front dimension from the rear dimension
to calculate the blade pitch.
Adjusting the Center Mower-Deck Pitch
1. Loosen the jam nuts on the top or bottom of the
height-of-cut-chain U-bolt
2. Adjust the other set of nuts to raise or lower the rear
of the mower deck and attain the correct mower-deck
pitch.
3. Tighten the jam nuts.
Figure 77
1. U-bolt
(Figure
77).
1
2
g020969
2. Height-of-cut chain
Adjusting the Wing Mower Decks
1. Remove the cap screws and nuts securing the castor
arm to the castor fork
2. Position the shims, as required, to raise or lower the
castor wheel until the mower deck has the correct pitch.
3. Install the cap screws and nuts.
1. Castor arm
2. Shims
Servicing the Caster-Arm
Bushings
The caster arms have bushings pressed into the top and
bottom of the tube and after many hours of operation, the
bushings develop wear. To check the bushings, move the
caster 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.
1. Raise the mower deck so the wheels are off the floor
and block the mower deck so it cannot fall.
2. Remove the tensioning cap, spacer(s), and thrust
washer from the top of the caster spindle.
3. Pull the caster spindle out of the mounting tube.
Note: Keep the thrust washer and spacer(s) on the
bottom of the spindle.
4. Insert a pin punch into the top or bottom of the
mounting tube and drive the bushing out of the tube
(Figure
79).
Note: Also drive the other bushing out of the tube.
Clean the inside of the tubes to remove dirt.
56
(Figure
78).
Figure 78
3. Castor fork
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