Multiquip HHN31VTCSL5 - Manual (Page 36)

page 36 — HHN31VTCSL5 RIDe-ON TROWeL • OpeRaTION aND paRTS maNuaL — ReV. #8 (05/03/12)
MaintenanCe
BLaDe pITCH
matching Blade pitch for Both Sets of Blades
Sometimes it may be necessary to match blade pitch between
the two sets of blades. There are some signs that this may be
necessary. For example, the differences in pitch could cause
a noticeable difference in finish quality between the two sets
of blades. Or, the difference in blade 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).
Single pitch™
On a Single Pitch™ trowel each spider assembly can be
pitched individually, forcing the operator to constantly make
adjustments on each pitch tower.
Twin pitch™
Trowels equipped with Twin Pitch™ controls may need
to have blade pitch between the two sets of blades
“syncronized”. If the blades need to be syncronized this is
easily accomplished by performing the following procedure.
Refer to Figure 31.
1. Lift the pitch adjustment handle on either side. Once
lifted, that side is now disconnected from the Twin
Pitch™ system.
2. Adjust to match the opposite side.
3. When adjusted, lower the handle to Twin Pitch™
operating position.
Figure 31. Pitch Towers
S E R I E S
WH ITE MA N
TWIN PITCH™
DISENGAGED
(ONE SIDE)
OPERATING
POSITION
Blade pitch adjustment procedure
Maintenance adjustment of blade pitch is made by adjusting
a bolt (Figure 32) 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 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?
„ Do the pitch control towers rock back and forth?
Figure 32. 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.
SPIDER PLATE
TROWEL LEVER (FINGER)
TROWEL ARM
BLADE PITCH
ADJUSTMENT BOLT