6-44
Troubleshooting Drive
Clutch/Driven Pulley
Problem: Midrange Shift-Up (Too Quickly - Lowers RPM)
Condition
Remedy
1.
Drive clutch spring
weak
2.
Driven pulley spring
weak
3.
Driven pulley spring preload tension
inadequate
4.
Center-to-center distance
too close
5.
Driven pulley bearing
worn — damaged
1. Replace drive clutch spring
2. Replace driven pulley spring
3. Increase spring preload tension
4. Adjust center-to-center distance
5. Replace bearing — movable sheave
Problem: Midrange Shift-Up (Too Slowly - Raises RPM)
Condition
Remedy
1.
Drive clutch components
dirty
2.
Driven pulley components
dirty
3.
Driven pulley spring preload tension
excessive
4.
Driven pulley bearing
worn — dirty
1. Clean drive clutch components
2. Clean driven pulley components
3. Decrease spring preload tension
4. Clean — replace bearing — movable sheave
Problem: Excessive Belt Deposits
Condition
Remedy
1.
Offset/parallelism
incorrect
2.
Drive clutch/driven pulley sheaves
rough — damaged
— dirty
3.
Driven pulley movable sheave travel
impaired
4.
Driven pulley bearing
worn — dirty
1. Adjust offset/parallelism
2. Repair — replace — clean drive clutch/driven pulley
3. Service driven pulley
4. Clean — replace bearing — movable sheave
Problem: Excessive Belt Drag—Impaired Drive Clutch Disengagement
Condition
Remedy
1.
Drive clutch components
dirty — damaged
2.
Drive belt
does not meet measurement specifications
1. Clean — replace drive clutch components
2. Replace drive belt
Problem: Engine RPM Suddenly Increases—Drive Clutch Vibrates
Condition
Remedy
1.
Cam arm pin
bent — damaged
2.
Cam arm
damaged — broken
3.
Drive clutch
out of balance
1. Replace pin
2. Replace cam arm
3. Align — replace components — drive clutch
Problem: Driven Pulley Vibrates
Condition
Remedy
1.
Sheave rivets
loose — broken
2.
Driven pulley
out of balance
1. Replace sheave
2. Service — replace driven pulley
Problem: Drive Clutch Engagement (Before Specified RPM)
Condition
Remedy
1.
Drive clutch spring
weak — bent
2.
Cam arms
incorrect — worn
1. Replace spring
2. Replace cam arms
Problem: Drive Clutch Engagement (After Specified RPM)
Condition
Remedy
1.
Drive clutch spring
incorrect
2.
Spider buttons
worn
1. Replace spring
2. Replace buttons
Problem: Drive Clutch Sticks
Condition
Remedy
1.
Drive clutch components
dirty
2.
Movable sheave
bent — binding
3.
Spider buttons
worn
1. Clean drive clutch components
2. Clean — replace movable sheave
3. Replace buttons
Problem: Drive Clutch Jerks—Shifts Erratically
Condition
Remedy
1.
Drive clutch
dirty
2.
Rollers
worn
3.
Cam arms
rough
4.
Spider buttons
worn
5.
Sheaves
dirty
1. Clean — drive clutch components
2. Replace rollers
3. Polish — replace cam arms
4. Replace buttons
5. Clean sheaves
Manual
Table of Contents
Summary of Contents for Sno Pro 120 2011
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