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EHTX44Y5 RIDE-ON TROWEL • OPERATION MANUAL — REV. #0 (01/16/13) — PAGE 33
MAINTENANCE
pitch could 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).
The right rocker switch (Twin Pitch™) pitches both blades
at the same time while the left rocker switch (Single Pitch)
will pitch only the left blade. Moving the switches forward
increases the pitch while moving them backward decreases
the pitch, (Figure 30).
Figure 30. Blade Pitch Rocker Switches
Blade Pitch Adjustment Procedure
Maintenance adjustment of blade pitch is made by adjusting
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.
Look for the following indications if blades are wearing
unevenly. If so, adjustment may be necessary.
Is 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?
BLADE PITCH
ROCKER SWITCHES
Figure 31. Blade Pitch Adjustment Bolt
The easiest and most consistent way to make adjustments
on the trowel arm fingers is to use the Trowel Arm Adjustment
Fixture (P/N 9177). It comes with all the hardware necessary
to properly accomplish this maintenance and instructions
on how to utilize this tool.
If a trowel arm adjustment fixture is not available and
immediate adjustment is necessary, temporary field
adjustment can be made if you can see or feel which blade
is pulling harder by adjusting the bolt that corresponds to
that blade.
A better way to determine which blades need adjustment
is to place the machine on a known FLAT surface (steel
metal plate) and pitch the blades as flat as possible. 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.
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 after adjustment the blades pitch correctly.
Blades that are incorrectly adjusted often will not be able to
pitch flat. This can occur if the adjusting bolts are raised too
high. Conversely, adjusting bolts that are too low will not allow
the blades to be pitched high enough for finishing operations.
BLADE PITCH
ADJUSTMENT BOLT
LEVER ARM
BLADE
SPIDER PLATE
TROWEL ARM