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).
BLADE PITCH
ROCKER SWITCHES
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
ADJUSTMENT BOLT
LEVER ARM
SPIDER PLATE | TROWEL ARM |
|
BLADE
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.
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