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1. Measure from the blade tip to a level surface.
7.
Rotate the blades to the B position
measure the distance of all the blades to the
level surface, and note the dimensions
28).
8.
Rotate the blades to the C position, measure,
and note the distance measured
Figure
28).
9.
Compare the measurements at the various
positions.
Note:
All dimensions must be equal within
6 mm (1/4 inch) from any 2 adjacent blades.
The difference between the dimensions of all
3 blades must not exceed 10 mm (3/8 inch). If
the difference exceeds specifications, proceed
to step 10.
10.
Remove the capscrews, flat washers, and
locknuts from the outer spindle in the area where
the shims must be added.
Note:
To raise or lower the blade, add a shim,
Part No. 3256-24, between the spindle housing
and bottom of the cutting unit.
11.
Continue checking the alignment of the blades
and adding shims until the tips of the blades are
within the required dimension.
Adjusting the Idler Pulley
The idler pulley applies force against the belt so that
power can be transmitted to the blade pulleys. If the
idler is not tensioned against the belt with sufficient
force, maximum power will not be transmitted to the
pulleys. Tension on the belt requires 47 to 54 N∙m (35
to 40 ft-lb) of torque on the large nut, which applies
force against the belt. If the idler is not adjusted to
these specifications, adjust it.
Important:
The fasteners on the covers of this
machine are designed to remain on the cover
after removal. Loosen all of the fasteners on
each cover a few turns so that the cover is loose
but still attached, then go back and loosen them
until the cover comes free. This will prevent you
from accidentally stripping the bolts free of the
retainers.
1.
Position the machine on a level surface.
Figure 28
(Figure
(Figure 27
2.
Lower the cutting unit, engage the parking
brake, put the traction pedal in neutral, the PTO
lever in the O
and remove the ignition key.
3.
Remove the cover from the center cutting unit.
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4.
Loosen the 2 nuts that secure the idler plate in
place.
5.
Use a socket and torque wrench to tighten the
idler adjusting nut to 47 to 54 N-m (35 to 40 ft-lb)
27),
(Figure
(Figure
and
1. Idler plate
2. Nuts (2)
6.
Hold the torque against the belt and tighten the
2 nuts so that the idler plate is held securely in
place.
7.
Release the idler adjusting nut.
8.
Install the cover.
Replacing the Drive Belt
The blade drive belt, tensioned by the adjustable
idler, is very durable. However, after many hours
of use, the belt will show signs of wear. Signs of a
worn belt include: squealing when belt is rotating,
blades slipping when cutting grass, frayed edges,
burn marks, and cracks. Replace the belt if any of
these conditions exist.
Important:
machine are designed to remain on the cover
after removal. Loosen all of the fasteners on
each cover a few turns so that the cover is loose
but still attached, then go back and loosen them
until the cover comes free. This will prevent you
from accidentally stripping the bolts free of the
retainers.
1.
Position the machine on a level surface.
2.
Lower the cutting unit, engage the parking
brake, put the traction pedal in neutral and the
23
position, shut the engine off,
FF
29).
Figure 29
3. Idler adjusting nut
The fasteners on the covers of this
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