nicked. Sharpen only the top side of the cutting
edge and maintain the original cutting angle to
ensure sharpness (
). The blade will
remain balanced if the same amount of metal is
removed from both cutting edges.
g000276
Figure 29
1.
Sharpen at original angle
Note:
Remove the blades and sharpen them on
a grinder; refer to Removing the Cutting Blades.
After sharpening the cutting edges, install the
blade with the anti-scalp cup and blade bolt. The
blade sails must be on top of the blade. Tighten
the blade bolt to 115 to 149 N·m (85 to 110 ft-lb).
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 m (3 ft) 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 (page 11)
.
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 1m (3 ft). If the dimension exceeds
1m (3 ft), replace the blade because it is bent.
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 1m (3 ft) lower than the outer
blades. If the center blade is more than 1m (3
ft) lower than the outer blades, proceed to step
and add shims 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 3 shims at
any 1 hole location. Use decreasing numbers
of shims in adjacent holes if more than 1
shim is added to any 1 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 occur.
1.
Lower the cutting unit to the shop floor. Remove
the belt covers from the top of the cutting unit
and set the covers aside.
2.
Using a torque wrench or similar tool, move the
idler pulley (
) away from the drive belt
to release the belt tension and allow the belt to
be slipped off the gearbox pulley (
g012238
Figure 30
1.
Idler pulley
g012239
Figure 31
1.
Gearbox
22
Summary of Contents for 30403
Page 24: ...Notes ...
