Back Lapping - Baroness LM180E Owner's Operating Manual

LM180E
Maintenance

Back Lapping

Back lapping is work similar to sharpening a
cooking knife. If the edges of the reel cutter
(cutting cylinder) and the bed knife (bottom
blade) become blunt and make cutting difficult,
both the reel cutter (cutting cylinder) and the
bed knife (bottom blade) should be
simultaneously sharpened by reversing the reel
cutter (cutting cylinder) with an abrasive paste
applied.
However, back lapping is a temporary measure
and would not restore the sharpness
completely.
If the edges of the reel cutter (cutting cylinder)
and the bed knife (bottom blade) become blunt
and difficult to cut, follow the steps below to
perform back lapping.
Warning
During back lapping, the reel cutter (cutting
cylinder) rotates.
Keep hands and feet away from moving parts.
Caution
Do not perform back lapping with any other
persons.
1. Have the following items ready: Back lapping
machine, Strips of newspaper, Abrasive
[Back lapping powder mixed with oil; or gel
compound (Baroness genuine abrasive)],
Brush, Socket (opposite side 27).
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Newspaper
Back lapping powder
Gel compound
Brush
Socket (opposite side 27)
27 mm (1.06 in)
Note:
Mixing ratio for abrasive in volume is one
part back lapping powder (#150 - #200) to
three or four parts oil.
Caution
When handling the reel cutter (cutting
cylinder) or bed knife (bottom blade), wear
gloves to protect your hands.
Pay attention not to let the reel cutter (cutting
cylinder) catch your gloves, etc. Otherwise,
you may injure your hand or fingers.
Important
After cutting grass, adjust the engagement of
the blades, before checking the sharpness of
the blade.
2. Stop the engine.
3. Apply the parking brake.
4. Raise the mower unit that requires back
lapping.
5. Remove the belt for the mower unit that
requires back lapping.
6. Insert two or three strips of newspaper into
the space between the reel cutter (cutting
cylinder) and the bed knife (bottom blade) at
an angle of 90 degrees, then rotate the reel
cutter (cutting cylinder) counter-clockwise
(when you face the mower unit from the left)
by hand to check the sharpness.
7. Check the sharpness at entire range (three
or four points from left edge to right one) of
the reel cutter (cutting cylinder).
8. Using a piece of chalk, mark locations on the
blade that are sharp.
9. Lower the mower unit that requires back
lapping to the ground.
10. Connect the lapping machine and the shaft
of reel cutter (cutting cylinder) with the
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socket (opposite side 27).
11. Turn on the switch of the lapping machine to
rotate the reel cutter (cutting cylinder) in the
direction opposite to the cutting direction.
12. Apply the abrasive evenly with the brush on
the top side of reel cutter (cutting cylinder)
where the newspaper was cut well or of
chalk-marked locations. (Never apply to
blunt areas.)
Maintenance Work