Ransomes MT503, Safety, Operation & Maintenance Manual/Parts List

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7 OPERATION
7.12 BACKLAPPING (CYLINDER UNITS ONLY) ______________________________
This mower has the ability to allow the cylinder to be driven in reverse direction for backlapping.
See section 6.5.18
•
Backlapping is a process which will lightly hone 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 backlap paste is only applied to the cylinder when it is
stationery, the engine is off and the park brake applied.
• When applying backlap 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 backlap 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 backlap paste:
BACKLAP PROCEDURE
1. Apply an even coat of Backapping compound to the entire length of each blade of the cylinder.
2. Set Engine Speed control to Minimum Low Idle Speed ensuring cylinders will rotate at there
slowest speed.
3. Start the engine.
4. Set Backlap Enable (6.5.18) & Engage PTO
5. Gradually adjust Cylinder to Bedknife. Stop Machine and repeat steps 1-4 until Blade is uniformly
sharp. The process should only require the Cylinder to be engaged for no longer than 5minutes of
operation. If the blades require more than this then consider having the cylinder professionally Ground
by an authorised Ransomes Jacobsen Dealer.
6. Once complete, switch the cutting unit switch (PTO to the off position) and shut off the engine.
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.
Backlap Paste
Part Number
80 grit backlap paste, 4.5kg tin
5002488
120 grit backlap paste, 4.5kg tin
5002489
80 grit backlap paste, 9kg tin
5002490
120 grit backlap paste, 9kg tin 5002491