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1.70
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. Lower the cutterheads to the ground.
Disengage the tractor rear P.T.O., apply the
handbrake, switch off the engine and remove
the ignition key.
2. Adjust the cutting cylinders to the bottom
blades to obtain 'fleeting contact'. Operate
the control lever fully across into the "Reverse
/ Back lap" mode. This will cause the cutting
cylinders to run at a reduced speed in reverse
on start up.
3. Apply a medium grade detergent based
carborundum paste to the cutting edges of the
cylinder 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 cutter
heads is clear of bystanders and keep hands
and feet clear of the cutting cylinders when
the tractor engine is running.
5. Start the tractor and set the engine speed at
idle.
6. Engage the P.T.O to start the cutting cylinders
rotating backwards and allow to run for a
period of time while listening to the grinding
action.
7. Stop the tractor engine and disengage the
P.T.O. when the grinding action has stopped.
8. Re-adjust the cutting cylinders to the bottom
blades and check that a thin piece of paper can
be cut cleanly at all points along the cutting
edges while rotating the cutting cylinders by
hand.
MAINTENANCE
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1.70
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