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PAGE 34 — HHN 31V
HHN-34TVD • RIDE-ON POWER TROWEL — OPERATION MANUAL — REV. #1 (05/08/06) — PAGE 34
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HHN 34TVD — MAINTENANCE
The "Variable Pitch Pulleys" have one
fixed face, and one moveable
face. The drive pulley ( torque converter, Figure 26) moveable face
is controlled by roller weight arms and springs, which change
position according to engine speed. The
driven pulley moveable
face is controlled by a spring and belt tension.
Figure 26. Variable Pitch Pulley
Figure 25. Pulley Interaction
As shown in Figure 24, centrifugal force pushes the roller arms (see
Figure 25 below) against the ramp plate, forcing moveable face
toward fixed face squeezing belt.
Figure 27. Pulley Conditions
How It Works (Figure 27)
Condition A:
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Engine Idling
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Drive Pulley: Small
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Driven Pulley: Large
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Belt: Loose and Stationary
Condition B:
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Engine Accelerating
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Drive Pulley: Small But Increasing
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Driven Pulley: Large But Decreasing
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Belt: Approaching Tightness
Condition C:
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Engine At High Speed
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Drive Pulley: Large
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Driven Pulley: Small
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Belt: Tight
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Drive Pulley
2
Driven Pulley
3
Low Engine RPM
4
Low Output Speed
5
High Engine RPM
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High Output Speed
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Moveable Face
(Controlled by a Spring and Belt Tension)
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Moveable Face
(Controlled by Roller Weight Arms and Springs)
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Distance Moveable Face Travels
10
Centrifugal Force
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Drive Pulley
2
Ramp Plate
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Weight
4
Roller Arm
5
Spring
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Bushing
A
B
C
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1
Drive Pulley
2
Driven Pulley
3
Neutral
4
Low Speed
5
High Speed
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