R21 Service
55
Deck Leveling
The mower deck and support frame are jig weld-
ed; within normal tolerances, very little, if any,
shimming should be required to level the deck.
Tire pressure will inuence the levelness of the
deck. Check the tire pressure of all pneumatic
tires as a possible cause of the deck not being
level.
1. Position mower on a smooth, level surface.
Turn off the engine and remove the ignition
key.
2. Set the cutting height to the highest position
at 4 in. (102 mm) - for easy access under the
deck to measure blade height. Refer to “Ad-
justing the Cutting Height” on page 29.
NOTE: A block of wood cut 4 in. (102 mm)
high is a convenient gauge to measure blade
height above ground during the leveling pro-
cess.
3. Check the side-to-side level. Rotate each
blade sideways and measure the distance
from blade tip to ground on each side. If mea-
surements vary more than 1/8 in. (3 mm), add
a washer shim under the deck support pins on
the low side to level the deck.
4. Check the front-to-rear level. Rotate the
blades to point forward. Measure the
distance from blade tip to ground on the front
and rear. The rear of the blade should be 1/8
to 1/4 in. (3 to 6 mm) higher than the front of
the blade; shim the rear (or front) deck support
pins equally to achieve at least 1/8 in. (3 mm)
difference.
Deck Leveling
4 in. (102 mm)
Wood Block
Should be 1/8 in. (3 mm)
to 1/4 in. (6 mm) higher at
the rear of the blade
4 in. (102 mm)
Wood Block
Should not vary more
than 1/8 in. (3mm)
side-to-side
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