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Operation 9
29932 (Rev. 8/10/2007)
Blade Servicing
Keep blades sharp for a good mowing job. Sharpen
both ends of the blade the same amount to maintain
balance. Do not sharpen blade to a razor edge, but
leave a 1/16" blunt edge. Do not sharpen back side of
blade. When replacing blades, do not substitute any
bolt for the special Nylok blade bolt. The Nylok bolt is
self-locking, meeting the non-loosening requirements
for this application.
NOTICE
■ On mowers with white frames, the blade bolts
have left hand threads.
59 mowers use cup washers under blades. These
washers will burn and lose their clamping force if
excess slippage occurs. Inspect and replace as neces-
sary.
HOW TO SOLVE BELT PROBLEMS
Assemble as shown on mower decal. If not installed
correctly, more twist will result than is allowable.
Belt whip is caused by belt misalignment unless mower
is driven by a rough-running or 2-cylinder engine.
Proper position: Adjust mower forward and back to
such a position that the rear take-up idlers are near the
bottom of their slots when the belt lines up with the
proper groove in the center pulley and is tight. Never
run the idlers high in the slots as this will cause mis-
alignment.
It is assumed that the mower is adjusted to run approx-
imately level. If the front of the mower is down, the
idlers will have to be raised. If the back of the mower is
down, the idlers will have to be down further. Belts
must be in proper alignment with sheave grooves as
shown in Figure 4.
PTO pulleys must be moved in or out to cause the belt
to be in alignment with the idlers.
Belt Tension: Run belts very tight. Present belt
designs are much stronger than we are accustomed to
and will stand more tension. Slipping will heat and ruin
a belt but tension is not harmful. You can minimize the
amount of change in belt length as mower is raised and
lowered by keeping the rear idlers adjusted to a low
position.
Figure 3. Use of Straight Edge (Side View)
How to Align a Twisted Belt
Right: Inside edge of belt are approximately lined up
with the sheave.
Figure 4.
Wrong: Outer edge of belt appears to be in line.
Figure 5.