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CUTTERHEAD BACKLAPPING
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 backlapping process:
Check that the mower engine is switched off and the parking brake applied.
Adjust the cutting cylinders to the bottom blades to obtain ‘fleeting contact’.
Apply a medium grade detergent based carborundum paste to the cutting
edges of the cylinders with a long handled brush.
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.
Sit on the operator seat, start the mower engine and set the engine speed at
idle.
Operate the cutterhead drive switch to the 'reverse/backlap' position for a
period of time and listen to the grinding action .
Operate the cutterhead drive switch to the 'off' position and switch off the
mower engine when the grinding action has stopped.
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.
If further backlapping is necessary repeat steps 2 to 8.
Thoroughly remove and wash off all traces of the carborundum paste from
the cylinders and bottom blades.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
80 Grade Carborundum paste
0,45 kg
11,25 kg
Hayter Part No:
63-07-088
63-07-086
90
0
1.57
1.57