Cutterhead Back Lapping - Toro 02740 Operator's Manual

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Cutterhead Back Lapping

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 reground.
The back lapping process:
1. Check that the mower engine is switched off
and the parking brake applied.
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
Part No.
0.45 kg (1 lb) 63-07-088
11.25 kg (25 lb) 63-07-086
4. Ensure that the area surrounding the
cutterheads is clear of people and keep hands
and feet clear of the cutting cylinders during
the period when the mower engine is running.
5. Sit on the operator seat, start the mower
engine and set the engine speed at idle.
6. Operate the cutterhead drive switch to the
'reverse/back lap' position for a period of time
and listen to the grinding action .
7. Operate the cutterhead drive switch to the 'off'
position and switch off the mower 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 back lapping is necessary repeat steps
2 to 8.
10. Thoroughly remove and wash off all traces of
the carborundum paste from the cylinders and
bottom blades.
MAINTENANCE
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