Machine Operation
www.nationalequipment.com
Phone: 763-315-5300
11
PREPARING MACHINE FOR JOB
BLADE SETTING
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Note: The 5280-AUS is designed to remove soft good materials.
•
Proper blade size and placement, depending on material and sub-fl oor type, af-
fects performance.
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The harder a job comes up, for best results, use a smaller blade.
•
Start with a narrow blade, then increase blade size to optimize cutting pass. Nar-
rower blades work easier than wider blades and usually clean the fl oor better.
Wider is not always better or faster.
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Normally bevel on blade is up for concrete (Figure H). Bevel down for wood (Figure
I).
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KEEP BLADES SHARP. Dull blades greatly affect the performance of the machine
and reduce cutting ability, resharpen or replace as needed.
•
Keep your work area clean and clear of debris. After you have removed a portion
of material, remove it out of the way. This will give the machine maximum perfor-
mance and help to keep the work area safe.
•
Always wear gloves when handling blades.
•
Everyone in work area should wear eye protection.
•
Wood or wood like fl oors: pound down or remove any nails or metal obstruction to
avoid blade damage.
•
Blades can be offset in cutting head for easier access to toe kicks or removal along
the wall (See Figure J).
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Sheet vinyl, solid vinyl, rubber tile, urethane or PVC sheet roofi ng, will need to be
scored for best removal results. Nationals #584 Scoring Tool (See Figure K). Score
fl ooring to the width of the blade.
•
Self scoring blades are available in a number of sizes. These blades eliminate the
need for pre-scoring material. Depending upon the type of material being removed
and the sharpness of the blade and scoring wings, the self scoring blades may
make it harder to control the machine. Keep scoring wings sharp at all times.
BLADE CHANGING
1. Place a block under the front of the machine as shown in Figure L, using a fl at piece
of 2” x 4” or something similar.
2. Use supplied extended “T” wrench or a 7/32 Allen wrench with at least a 3” exten-
sion to keep hand safely away from the sharp edge of the blade. Loosen two (2)
allen head bolts (See Figure M). It is not necessary to remove bolts.
3. Place blade into cutting head, sliding all the way back to the bolts. If the blade is
wider than the cutting head, center blade to head. If blade is smaller than the cut-
ting head, fi rst pass blade should be mounted in center of the cutting head. After
fi rst pass is made, blade can be offset in head to allow wheels to keep even contact
with the fl oor and allow easy access to the wall.
4. Hand tighten the bolts.
FIG. H
FIG. I
FIG. J
FIG. K
FIG. L
CAUTION:
BLADES ARE SHARP, USE EXTREME CAUTION WHEN HAN-
DLING. NEVER CHANGE CUTTING HEAD OR SERVICE BLADES WHILE
MACHINE IS RUNNING.
