Norton C3120 Owner's Manual page 25

xx). Do not force the blade in to the cut!! Step Cutting provides the best
performance (fastest cut and longest blade life). Never saw deeper than 4" per
pass as deeper passes will shorten the blade life and places higher stresses on
the saw. Never twist, rotate, or bend the blade while in the cut. Do not attempt
to cut in a circle or arc as the blade may be damaged.
Step Cutting
1. Follow general instructions outlined in the section D. Operating the Saw
pages 9 to 20.
2. When deep sawing (more than 4") or concrete with hard aggregate, sawing
to full depth in several cuts should be made in incremental steps of 1-1/2 to 2
inches until the desired depth of cut is reached. In softer aggregates or
asphalt, it may be possible to saw full depth in two passes.
3. Gradually move the speed control lever forward to increase the cutting
speed. If the blade stalls in the cut (which can happen when deep sawing)
immediately raise blade from cut using the button on the top of the speed
control lever. If not done at once, the belts will spin freely and burn. Check
belts for proper tension and continue sawing at a slower rate of speed.
4. On final pass, lower the blade until it hits the sub-base (sandy color will
appear in the water being discharged from the cut). Raise blade
approximately 1/2" from bottom. The sand and gravel particles of the sub-
base may cause premature wear or damage to the saw blade.
It is common, on the final pass of the cut, for pavement to wedge blade,
particularly on a hot day. When this happens, immediately stop engine. If the
blade is wedged, remove the Blade Shaft Bolt and Outside Collar and move the
saw away from the blade. To remove a wedged blade from the concrete, use a
jack hammer and carefully chip out concrete around the blade. (Pounding or
twisting the blade may cause severe damage).
6. Go slowly with a new blade until it "opens up" that is, until you can see and
feel the diamonds.
7. If saw leads off excessively, adjustment can be made on the left side of the
rear axle (see section F. Lead Off Adjustment on page 26 of this manual).
Small corrections can be made by leaning on handles.
8. Deep sawing is very hard on saws and blades. Experienced operators soon
get a "feel" for the saw and are constantly on guard to slow down when they
hit excessive steel or hard aggregate.
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