Multiquip HTX44Y5 - Manual (Page 36)

PAGE 36 — HTX-YANMAR DIESEL • RIDE-ON POWER TROWEL — OPERATION MANUAL — REV. #0 (07/06/06)
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HTX-YANMAR DIESEL — MAINTENANCE
Matching Blade Pitch for Both Sets of Blades
Sometimes it may be necessary to match blade pitch between
the left and right sets of blades. There are some signs that this
may be necessary. For example, the differences in pitch can
cause a noticeable difference in finish quality between the left
and right sets of blades. The difference in blade pitch can also
make the machine difficult to control. This is due to the surface
area in contact with the concrete, (the blade set with the greater
contact area tends to stick to the concrete more).
To synchronize pitch on both sides, the left blade assembly can
be pitched by itself. By using the electric blade pitch rocker
switches, (Figure 30) the pitch can be syncronized on the left
and the right sides.
■ Is the machine wearing out blades unevenly, (i.e. one blade
is completely worn out while the others look new)?
■ Does the machine have a perceptible rolling or bouncing
motion when in use?
■ Look at the machine while it is running, do the guard rings
“rock up and down” relative to the ground?
Watch for the following indications when determining if blade
pitch adjustments are necessary:
Blade Pitch Adjustment Procedure
The maintenance adjustment of blade pitch is an adjustment
that is made by a bolt, (Figure 31) on the arm of the trowel blade
finger. This bolt is the contact point of the trowel arm to the lower
wear plate on the thrust collar. The goal of adjustment is to promote
consistent blade pitch and finishing quality.
Figure 30. Blade Pitch Rocker Switches
The easiest and most consistent way to make this adjustment is
to use the Trowel Arm Adjustment Fixture (P.N. 9177) that is
manufactured by Whiteman Industries. This fixture will allow
consistent adjustment of the trowel arm fingers. It comes with all
the hardware necessary to properly accomplish this maintenance
and instructions on how to properly utilize this tool. Adjusting the
trowel arm fingers without a fixture requires a special talent.
If a trowel arm adjustment fixture is not available and immediate
adjustment is necessary; we suggest the following procedure. If
you can see or feel which blade is pulling harder, adjust the bolt
that corresponds to that blade. Another way to determine which
blades need adjustment is to place the machine on a flat surface
and pitch the blades as flat as possible. Now, look at the
adjustment bolts. They should all barely make contact with the
lower wear plate on the spider. If you can see that one of them is
not making contact; some adjustment will be necessary.
It will be possible to adjust the “high” bolts down to the level of
the one that is not touching, or adjust the “low” bolt up to the level
of the higher ones. If possible, adjust the low bolt up to the level
of the rest of the bolts. This is the fastest way, but may not always
work. Verify that after adjustment, the blades pitch correctly. Often
times, if the blades are incorrectly adjusted, they will not be able
to pitch flat. This occurs when the adjusting bolts have been
raised too high. Conversely, sometimes the adjusting bolts are
too low and the blades cannot be pitched high enough for
finishing operations.
Adjustments are made by tightening or loosening the blade pitch
adjustment bolt, (Figure 31).
Figure 31. Blade Pitch Adjustment Bolt
1
5
2
4
3
1. Spider Plate
2. Blade Pitch Adjustment Bolt
3. Trowel Lever
4. Trowel Arm
5. Trowel Blade