Table of Contents
Advertisement
A
B
C
Figure 85
3. Examine the cutting edges of all of the blades. Sharpen
the cutting edges if they are dull or nicked. Sharpen
only the top of the cutting edge and maintain the
original cutting angle to make sure of sharpness
(Fig. 86). The blade will remain balanced if the same
amount of metal is removed from both cutting edges.
Danger
If the blade is allowed to wear, a slot will form
between the sail and flat part of the blade
(Fig. 85-C). Eventually a piece of the blade may
break off and be thrown from under the housing,
possibly resulting in serious injury to you or
bystanders.
• Inspect the blade periodically for wear or
damage.
• Never try to straighten a blade that is bent or
weld a broken or cracked blade.
• Replace a worn or damaged blade.
SHARPEN AT THIS
ANGLE ONLY
END VIEW OF
BLADE
Figure 86
Note: Remove the blades and sharpen them on a grinder.
After sharpening the cutting edges, install the blade with
the anti-scalp cup and blade bolt; refer to Removing and
Installing the Cutter Blade(s), page 51.
Correcting Cutting Unit
FLAT PART
OF BLADE
Mismatch
SAIL
If there is mismatch between the blades, on a single cutting
unit, 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
SAIL
plane.
1. Using a 3 foot (1 meter) long carpenters level, find a
WEAR
2. Raise the height-of-cut to the highest position; refer to
SAIL
3. Lower the cutting unit onto the flat surface. Remove the
SLOT
FORMED
4. Loosen the flange nut securing the idler pulley to
5. Rotate the blades until the ends face forward and
6. Compare the measurements of the outer blades with the
7. Remove the capscrews, flat washers, lock washers, and
Important
hole location. Use decreasing numbers of shims in adjacent
holes if more than one shim is added to any one hole
location.
8. Adjust the idler pulley and install the belt covers.
52
level surface on the shop floor.
Adjusting the Height-Of-Cut, page 18.
covers from the top of the cutting unit.
release the belt tension.
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 1/8 in. (3 mm). If the dimension
exceeds 1/8 in. (3 mm), replace the blade because it is
bent. Make sure to measure all of the blades.
the center blade. The center blade must not be more
than 3/8 in. (10 mm) lower than the outer blades. If the
center blade is more than 3/8 in. (10 mm) lower than the
outer blades, proceed to step 7 and add shims between
the spindle housing and the bottom of the cutting unit.
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.
Do not use more than three shims at any one
Advertisement
Table of Contents
