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Backlapping the Cutting
Unit
WARNING
Contact with the cutting units or other moving
parts can result in personal injury.
• Keep your hands and clothing away from
the cutting units or other moving parts.
• Never attempt to turn the cutting units by
hand or foot while the engine is running.
This process is recommended for restoring the sharp
cutting edges to cylinders and bottom blades which
are essential for good quality grass cutting.
This process can only remove a small amount of
metal to restore the cutting edges. If the blade edges
are seriously worn or damaged, it will be necessary to
remove the component parts and grind them.
1.
Turn the engine off and apply the parking brake.
2.
Adjust the cutting cylinders to the bottom blades
to obtain fleeting contact.
3.
Apply a medium-grade detergent-based
carborundum paste to the cutting edges of the
cylinders with a long handled brush.
80 Grade Carborundum Paste
1 lb (0.45 kg)
25 lb (11.25 kg)
Figure 15
4.
Ensure that the area surrounding the cutting
units is clear of people. Keep your hands and
feet clear of the cutting cylinders while the
engine is running.
Part No.
63-07-088
63-07-086
g014445
5.
Sit on the operator seat, start the engine, and
set the engine speed at idle.
6.
Operate the cutting unit drive switch to the
reverse/back lap position for a period of time
and listen to the grinding action.
7.
Operate the cutting unit drive switch to the O
position and switch off the engine when the
grinding action has stopped.
8.
Thoroughly clean the blade edges and adjust the
cutting cylinders to the bottom blades. Check
that a thin piece of paper can be cut cleanly at
all points along the cutting edges while rotating
the cylinders by hand.
9.
If further backlapping is necessary repeat steps
2 through 8.
10.
Thoroughly remove and wash off all traces of
the carborundum paste from the cylinders and
bottom blades.
Grinding the Cutting Unit
Grind the cylinder spiral edges or bottom blade edges
if they become excessively rounded or distorted.
Replace the bottom blades when they are near the
end of their wear life. Grind new blades on their
holders prior to fitting. When grinding is necessary,
grind both cylinders and bottom blades at the same
time, except when a new cylinder is fitted, in which
case it is necessary only to grind the bottom blade.
All grinding operations should be performed by
your authorized Toro distributor on a quality, well
maintained cylinder/bottom blade grinding machine.
13
Figure 16
g014443
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