2005-2007 Polaris Ranger 500 service manual, Page 188Get this manual
CLUTCHING DRIVE CLUTCH SERVICE
Spring Specifications
The drive clutch spring has two primary functions: 1To control clutch engagement RPMThe springs which have higher rate when the clutch is in neutral will increase clutch engagement RPMTo control the rate at which the drive belt moves upward in the drive clutch sheavesThis is referred to as drive clutch upshiftThere are other components which control upshift, but the spring is one of the primary components in insuring optimum performanceIt is very important that the spring is of the correct design and is in good condition
CAUTION
Never shim drive clutch spring to increase its compression rateThis may result in complete stacking of the coils and subsequent clutch cover failure
The drive clutch spring is one of the most critical components of the PVT systemIt is also one of the easiest to serviceDue to the severe relaxation the spring is subject to during operation, it should always be inspected for tolerance limits during any clutch operation diagnosis or repairWith the spring resting on flat surface, measure its free length from the outer coil surfaces as shownRefer to the spring specification chart for specific free length measurements and tolerancesAlso check to see that spring coils are parallel to one anotherDistortion of the spring indicates stress fatigue, requiring replacement