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Checking and Correcting
Mismatch of Blades
If there is mismatch between the blades, the grass will appear
streaked when it is cut. This problem can be corrected by
making sure that the blades are straight and all of the blades
are cutting on the same plane.
1. Using a 1 meter (3 foot) long carpenters level, find a
level surface on the shop floor.
2. Raise the height-of-cut to the highest position; refer to
Adjusting the Height-of-Cut.
3. Lower the cutting unit onto the flat surface. Remove
the covers from the top of the cutting unit.
4. Rotate the blades until the ends face forward and
backward. Measure from the floor to the front tip of
the cutting edge. Remember this dimension. Then
rotate the same blade so that the opposite end is
forward, and measure again. The difference between
the dimensions must not exceed 3 mm (1/8 inch). If
the dimension exceeds 3 mm (1/8 inch), replace the
blade because it is bent. Make sure to measure all of
the blades.
5. Compare the measurements of the outer blades with
the center blade. The center blade must not be more
than 10 mm (3/8 inch) lower than the outer blades. If
the center blade is more than 10 mm (3/8 inch)) lower
than the outer blades, proceed to step
between the spindle housing and the bottom of the
cutting unit.
6. Remove the bolts, flat washers, lock washers, and nuts
from the outer spindle in the area where the shims
must be added. To raise or lower the blade, add a shim,
Part No. 3256-24, between the spindle housing and
the bottom of the cutting unit. Continue to check the
alignment of the blades and add shims until the tips of
the blades are within the required dimension.
Important: Do not use more than three shims at
any one hole location. Use decreasing numbers of
shims in adjacent holes if more than one shim is
added to any one hole location.
7. Install the belt covers.
Replacing the Drive Belt
The blade drive belt, tensioned by the spring loaded idler
pulley, is very durable. However, after many hours of use,
the belt will show signs of wear. Signs of a worn belt are:
squealing when belt is rotating, blades slipping when cutting
grass, frayed edges, burn marks and cracks. Replace the belt if
any of these conditions are evident.
1. Lower the cutting unit to the shop floor. Remove the
2. Using a torque wrench or similar tool, move the idler
1. Idler pulley
6
and add shims
1. Gearbox
3. Remove the old belt from around the spindle pulleys
4. Route the new belt around the spindle pulleys and idler
24
belt covers from the top of the cutting unit and set the
covers aside.
pulley
(Figure
33) away from the drive belt to release
the belt tension and allow the belt to be slipped off the
gearbox pulley
(Figure
34).
Figure 33
Figure 34
and idler pulley.
pulley assembly as shown in
Figure
35.
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