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9 ADJUSTMENTS
9.4 BACKLAPPING ____________________________________________________
Routine cylinder backlapping is part of a general
maintenance plan for cylinder mowers.
NOTE:Even when the engine is OFF, rotating one cylinder
may cause the others to rotate.
Use the following procedure with the engine off and the
cylinders disengaged.
1. Wash the cylinders and bottom blades.
2. Slightly back off the cylinder to bottom blade
adjustment.
3. Apply lapping compound to the cylinders BEFORE
starting the engine and engaging the cylinders.
NOTE:DO NOT apply lapping compound to cylinders
UNLESS the engine is off and the cylinders disengaged.
DO NOT apply lapping compound to rotating cylinders.
4. Lower the cutting units so they are firmly on the ground, apply the parking brake, place the cylinder control
switch (A) in the backlap position. With the operator in the operating position, start the engine. DO NOT
run the engine in an enclosed area.
5. Run the engine at idle speed. Start the PTO. Engage the reel drive (B) from the operators position on the
machine. The engine revs may need to be increased to allow the units to engage but then should be
returned to idle to limit cylinder speed.
6. Backlap reels for several minutes, periodically disengage cylinder drive, shut off engine and check the
blade condition. Add additional backlapping compound and adjust cylinder to bottom blade clearance.
Return to the operating position and continue backlapping until all blades are uniformly sharp.
7. Disengage cylinder drive, shut off engine and thoroughly wash all backlapping compound from cylinders
and bottom blades. Apply a thin coating of oil to all sharpened surfaces.
8. For a finer cut, file across the front face of the bottom blade to remove any burrs from the sharp edge.
9. Adjust the cylinder to bottom blade (see cutting unit manual).
A
B
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