IHI Shibaura SR525HP-S, Operator'S Manual

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Section 8 Handling of mower
5. Adjusting the cutting quality by
lapping (grinding)
Warning
● Be sure to use the blade aligning fixture to
rotate the rotary blade.
● Be sure to coat the rotary blade with abrasive
using a brush.
(1) Set the change-over valve levers to the stop
side at 5 points.
(2) Insert a strip of newspaper between the
rotary blades and lower blade, turn the reel
blade counterclockwise with the blade
aligning fixture to cut the newspaper, to test
the cutting quality. Mark a point of good
cutting quality with chalk, etc.
● Test the cutting quality in the above
procedure for each blade on the overall
width.
(3) Lower the mower and position the No.4 and
5 units to the lapping position.
(Refer to the maintenance position for No.4
and 5 units on page 42.)
(4) Attach the abrasive to a brush and coat the
top surface of the rotary blade marked in
above (2) evenly.
● Compound is coated on the area of good
cutting quality because the sharp points are
higher while dull points have been worn
away and become lower. The higher points
of the blade should be ground to make the
height of the rotary blades even. (Never coat
the dull points with the compound.)
● Use a compound of mixed lapping
compound (#120 - #180) and oil (or neutral
detergent) at a rate of 1 : 3 – 4.
(5) Start the engine and push the lapping button
to light up the lamp.
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