6.46
9924871 R03 - 2014 Polaris Sportsman® 570 EFI Service Manual
© Copyright 2013 Polaris Sales Inc.
TROUBLESHOOTING
SITUATION
PROBABLE CAUSE
REMEDY
Engine RPM
below specified
operating range,
although engine
is properly tuned.
-Wrong or broken drive clutch spring.
-Drive clutch shift weight too heavy.
-Driven clutch spring broken or installed in
wrong helix location.
-Replace with recommended spring.
-Install correct shift weight kit to match engine
application.
-Replace spring; refer to proper installation
location.
Erratic engine
operating RPM
during
acceleration or
load variations.
-Drive clutch binding.
-Belt worn unevenly - thin / burnt spots.
-Driven clutch malfunction.
-Sheave face grooved.
A. Disassemble drive clutch; inspect shift
weights for wear and free operation.
B. Clean and polish stationary shaft hub;
reassemble clutch without spring to determine
problem area.
-Replace belt.
A. Replace ramp buttons.
B. Inspect movable sheave for excessive
bushing clearance.
-Replace the clutch.
Engine RPM
above specified
operating range.
-Incorrect drive clutch spring (too high spring
rate).
-Drive clutch shift weights incorrect for
application (too light).
-Drive clutch binding.
-Driven clutch binding.
-Converter sheaves greasy; belt slipage.
-Install correct recommended spring.
-Install correct recommended shift weights.
-Disassemble and clean clutch, inspecting shift
weights and rollers. Reassemble without the
spring and move sheaves through entire range
to further determine probable cause.
-Disassemble, clean, and inspect driven clutch,
noting worn sheave bushing and ramp buttons
and helix spring location.
-Clean sheaves with denatured alcohol or brake
cleaner, install new belt.
Harsh drive clutch
engagement.
-Drive belt worn too narrow.
-Excessive belt / sheave clearance with new
belt.
-Replace belt.
-Perform belt / sheave clearance adjustment
with shim washers beneath spider.
Drive belt turns
over
-Wrong belt for application.
-Clutch alignment out of spec.
-Engine mount broken or loose.
-Replace with correct belt.
-Adjust clutch alignment.
-Inspect / adjust or replace.
Belt burnt, thin
spots
-Abuse (continued throttle application when
vehicle is stationary, excess load)
-Dragging brake
-Slow, easy clutch engagement
-Caution operator to operate machine within
guidelines.
-Vehicle operated with park brake on. Inspect
brake system.
-Fast, effective use of throttle for efficient
engagement.
CLUTCHING
