HHN-34TVD • RIDE-ON POWER TROWEL — OPERATION MANUAL — REV. #1 (05/08/06) — PAGE 35
Trowels equipped with Twin Pitch
TM
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. Refer to Figure 29.
Blade Pitch
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).
1.
Lift the pitch adjustment handle on either side. Once lifted,
that side is now disconnected from the Twin Pitch
TM
system.
2.
Adjust to match the opposite side.
3.
When adjusted, lower the handle to Twin Pitch
TM
operating
position.
Figure 29. Pitch Towers
Matching Blade Pitch for Both Sets of Blades
A
Twin Pitch
TM
disengaged (one side)
B
Operating Position
S
E
R
I E
S
W
H I
T E
M
A N
A
B
The torque sensitive pulley (Figure 28) utilizes a spring and cam
bracket. Peak performance results from proper interaction between
the driven pulley spring and the ramp angle of the cam bracket.
Figure 28. Pulley Spring and Cam Bracket
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.
HHN 34TVD — MAINTENANCE
This clutch system provides a high pulley ratio (a low gear- so to
speak) to start out and a low pulley ratio ( a high gear- so to
speak) for a high speed operation, with infinite variation between
the two.
This means that it will not be necessary to give
full throttle in
order to "break the blades/pans loose". The machine can slowly
be brought up to speed.
Clutch
1
2
3
4
5
1
Spring
2
Driven Pulley
3
Fixed Face
4
Moveable Face
5
Cam Bracket
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