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PAGE 32 — HHXG5 RIDE-ON TROWEL • OPERATION MANUAL — REV. #1 (10/25/10)
Figure 24. Pulley Interaction
The "Variable Pitch Pulleys" have one fixed face, and one
moveable face. The drive pulley 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 25)
WEIGHT
RAMP
PLATE
BUSHING
ROLLER ARM
SPRING
DRIVE PULLEY
Figure 25. Variable Pitch Pulley
DRIVE
PULLEY
DRIVE
PULLEY
LOW OUTPUT
SPEED
DRIVEN PULLEY
LOW ENGINE RPM
HIGH ENGINE RPM
DRIVEN PULLEY
HIGH OUTPUT
SPEED
CENTRIFUGAL FORCE
DISTANCE
MOVEABLE
FACE
TRAVELS
MOVEABLE FACE
IS CONTROLLED
BY A SPRING
AND BELT T
ENSION
MOVABLE FACE IS
CONTROLLED BY
ROLLER WEIGHT ARMS
AND SPRINGS
How It Works (Figure 25)
Condition A:
• Engine Idling
• Drive Pulley: Small
• Driven Pulley: Large
• Belt: Loose and Stationary
Condition B:
• Engine Accelerating
• Drive Pulley: Small But Increasing
• Driven Pulley: Large But Decreasing
• Belt: Approaching Tightness
Condition C:
• Engine At High Speed
• Drive Pulley: Large
• Driven Pulley: Small
• Belt: Tight
Figure 26. Pulley Conditions
A B
C
1
2
3
4
5
MAINTENANCE (OLD STYLE CLUTCH)