Checking And Correcting Mismatch Of Blades - Toro 31971 Operator's Manual

Figure 26
1. Cutting edge
2. Curved area
4. Examine the cutting edges of all of the blades
and sharpen the cutting edges if they are dull
or nicked (Figure 27).
Note:
Sharpen only the top of the cutting
edge and maintain the original cutting angle
to ensure sharpness
remains balanced if the same amount of metal
is removed from both cutting edges.
Figure 27
1. Sharpen at the original angle.
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3. Wear/slot forming
4. Crack
(Figure 27). The blade
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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
the Cutting Unit Blade(s) (page
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
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. 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
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.
21
Inspecting and Sharpening
20).
6 and add shims between the
12).