Cutterheads System Maintenance; Back Lapping The Cutterheads - Toro LT3340 Operator's Manual

Cutterheads System
Maintenance

Back Lapping the Cutterheads

WARNING
Contact with the cutterheads or other moving parts
can result in personal injury.
• Keep fingers, hands, and clothing away from the
cutterheads or other moving parts.
• Never attempt to turn the cutterheads 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 deal with a small amount of metal
removal to restore the cutting edges. If the blade edges are
seriously worn or damaged it will be necessary to remove the
component parts and have them ground again.
1. Ensure that the mower engine is off and that the
parking brake is set.
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
0.45 kg (1 lb)
11.25 kg (25 lb)
4. Sit on the operator seat, start the mower engine, and
set the engine speed at idle.
WARNING
If you touch the cutterheads when the engine
is running, you could be seriously injured.
• Ensure that the area surrounding the
cutterheads is clear of people.
• Keep hands and feet clear of the cutting
cylinders during the period when the
mower engine is running.
5. Operate the cutterheads drive switch to the
reverse/back lap position for a period of time and
listen to the grinding action.
6. Operate the cutterheads drive switch to the off position
and switch off the mower engine when the grinding
action has stopped.
7. Thoroughly clean the blade edges and adjust the cutting
cylinders to the bottom blades.
8. 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 back lapping 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.
47
Part number
63-07-088
63-07-086
G014445
Figure 63