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away the metal that connects the flat and curved
parts of the blade, check the blade before using the
machine. If wear is noticed (Fig. 19-B), replace the
blade: refer to Removing The Cutter Blade.
If the blade is allowed to wear, a slot will form
between the sail and flat part of the blade (Fig. 17-
C). Eventually a piece of the blade may break off
and be thrown from under the housing, possibly
resulting in serious injury to yourself or a
bystander.
5.
Inspect the cutting edges of all 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 for best performance (Fig.
20). The blade will remain balanced if the same
amount of metal is removed from both cutting
edges.
6.
To check the blade for being straight and parallel,
lay the blade on a level surface and check its ends.
Ends of the blade must be slightly lower than the
center, and the cutting edge must be lower than the
heel of the blade. This blade will produce good
quality of cut and require minimal power from the
engine. By contrast, a blade that is higher at the
ends than the center, or that has a cutting edge
higher than the heel, is bent or warped and must be
replaced.
7.
Install the blade sail facing (up) toward the cutting
unit with cup and blade bolt. Tighten blade bolt to
115–149Nm.
CORRECTING CUTTING UNIT
MISMATCH
If there is mismatch between the blades, the grass will
appear streaked when it is cut. This problem can be cor-
rected by making sure the blades are straight and all
blades are cutting on the same plane.
1.
Position the machine on a level surface on the shop
floor.
2.
Release the belt tension on the belts.
3.
Raise the deck to the transport position and lock
the transport latch.
18
DANGER
4.
Position the tip of the outer blade and adjacent
blade tip as close together as possible at the inter-
section of the two cutting chambers. Note the
height of the outer blade tip with respect to the
height of the adjacent blade tip.
5.
Rotate the outer blade 180° and note the height of
the outer blade tip with respect to the height of the
adjacent blade tip. If the relative height changed by
more than 3 mm after rotating the blade, then the
outer blade is bent and should be replaced..
6.
Repeat steps 4 and 5 until all pairs of adjacent
blades have been checked at both blade tips. Note
the relative difference in blade height at each blade
intersection after replacing any bent blades. This
height difference should be less than 3 mm for all
adjacent blades.
7.
'Raise the height-of-cut to the highest position and
lower the deck to the floor.
8.
Rotate an outer blade until the tip is positioned
nearest to the skid on the side of the deck housing.
Measure the distance from the bottom of the blade
to the floor. Repeat the measurement on the oppo-
site side of the deck. If the two measurements dif-
fer by more than 6 mm, go to step 9 and add shims
as instructed.
9.
Remove the capscrews, flatwashers, lockwashers
and nuts from the outer spindle in the area where
shims must be added. To raise or lower the blade,
add a ship, 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 individual hole location. Use decreasing
numbers of shims in adjacent holes if more than
one shim is added to a hole location.
10. Re-tension the belts. Reinstall the belt covers.
IDENTIFICATION AND ORDERING
MODEL AND SERIAL NUMBERS
The cutting deck has two identification numbers: a
model number and a serial number. The two numbers
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