Graco GrindLazer Pro RC813 G Operation, Repair, And Parts page 19

2. Use the Pressure Control Dial to set the Pressure
Indicator to 2-3.
3. The cutting mark left by the machine should be an
uneven circle.
4. If the mark is in the wrong direction, adjust the
elevation screws to pitch the cutter head to the
correct plane. See page 17.
3A5581C
Cutting Technique
These are recommended settings only. Increasing
spring tension, depth of cut and pitch will increase the
removal speed at the expense of reduced life and
surface finish.
Care must always be taken to lift up the rotating
heads over any significant obstruction, including steel
or concrete expansion joints that can cause the cut-
ters or spindle components to break.
Should you desire to tilt the machine, always tilt
forward. Tilting the machine backwards at any time
will flood the spark plug with oil and may cause
damage to your engine.
NOTE: On harder surfaces, it may be best to make
several passes in increments of 1/32 in. (0.8 mm) to get
to the desired depth.
• Make certain that the cutter head is positioned to
where only the cutter tips strike the surface.
• The cutter head will not withstand substrate contact.
NOTE: Contacting the removal surface too deeply
will cause premature wear to the cutter head and
other components. The correct depth setting is
indicated by relatively little machine vibration.
• Cutting too deep only has negative results. Try to
remove materials in several passes rather than one,
deep pass. Several tests will show the best, most
appropriate cutter impact. Use a forward, backward
and/or circular pattern to achieve your desired
finish.
NOTE: Positioning the machine over the surface in
many directions, as well as dialing the hand wheel up or
down can help create desirable surface patterns. After
several hours of practice, the operator will become
comfortable and should be able to remove materials
faster with enhanced results.
NOTE: The engine should not labor. Run engine at full
speed and adjust the forward speed to fit the work being
performed. Harder concrete surfaces will have to be cut
at a slower pace than asphalt or other softer surfaces.
Operation
NOTICE
NOTICE
NOTICE
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