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6 OPERATION
6.11 BACKLAPPING _______________________________________________________
This mower has the ability to allow the cylinders to be driven in reverse direction for Backlapping
•
Backlapping is a process which will lightly grind the cylinder to the bottom blade while installed on the
mower.
•
If significant amounts of metal are to be removed then the cutting unit must be reground on a special
grinding machine.
•
Before any Backlapping is done, Ransomes Jacobsen recommends that the Backlapping procedure
must be risk assessed as a workshop process by the manager of the machine.
•
Backlapping must only be done by approved personnel.
•
Ransomes Jacobsen recommend that grinding paste is only applied to the cylinder when it is
stationery, the engine is off and the parking brake applied.
•
When applying grinding paste the cylinder must only be rotated by appropriately sized piece of wood
and not by hand.
•
Place cylinders in the most accessible position for applying the paste.
•
After applying the grinding paste the person Backlapping must return to the seat, engage the relevant
controls and run the cylinders in reverse.
•
When the desired finish is achieved switch off the mower, clean off any surplus paste, reset the cylinder
to bottom blade and return the controls to the normal mow positions.
Ransomes Jacobsen grinding paste:
PROCEDURE
1.
Apply an even coat of Backlapping compound to the entire length of each blade of the cylinder.
2.
Turn the cylinder Speed Control valves to allow cylinders to rotate at there slowest speed.
3.
Set the Backlap switch to the Backlap position.
4.
Start the engine and set the throttle to low idle. Switch the cutting unit switch (PTO) (B) to the on
position.
5.
If necessary adjust the throttle until the desired cylinder rotation speed is attained. It must be slow
enough so that the cylinder will not throw off the Backlapping compound as it spins.
6.
Once all the blades on the cylinder are uniformly sharp, shut off the engine and switch the cutting unit
switch (PTO to the off position. Set the Backlap switch to off and close the cylinder Speed Control (all
the way clockwise).
NOTE
•
To ensure proper cylinder rotation, make sure the cylinder Speed Control has been reset to normal
running.
7.
Wash all of the Backlapping compound from all of the heads. Once they are thoroughly cleaned and
dry, apply a light film of oil to the cutting edges to help prevent rust.
8.
After Backlapping, the cylinder to bottom blade adjustment must be made again.
en-50
Grinding Paste
80 grit grinding paste, 4.5kg tin
120 grit grinding paste, 4.5kg tin
80 grit grinding paste, 9kg tin
120 grit grinding paste, 9kg tin
Part Number
5002488
5002489
5002490
5002491
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