Polaris 2009 Trail Boss 330 Service Manual page 128

CLUTCH
PVT OVERHEATING/DIAGNOSIS
During routine maintenance or whenever PVT system overheating is evident, it's important to check the inlet
and outlet ducting for obstructions. Obstructions to air flow through the ducts will significantly increase PVT
system operating temperatures. The ATV should be operated in LOW RANGE (if equipped) when pulling
or plowing heavy loads, or if extended low speed operation is anticipated.
GENERAL RANGE OPERATION
GUIDELINES:
Diagnosis of Clutch Drive Belt & Cover Related Issues:
Possible Causes
Loading the ATV into a pickup or tall trailer
when in high range.
Starting out going up a steep incline.
Driving at low RPM or low ground speed
(at approximately 3--7 MPH).
Insufficient warm--up of ATVs exposed to
low ambient temperatures.
Slow and easy clutch engagement.
Towing/Pushing at low RPM/low ground
speed.
Plowing snow, dirt, etc./utility use.
Stuck in mud or snow.
Climbing over large objects from a
stopped position.
Belt slippage from water or snow ingestion
into the PVT system.
Clutch malfunction.
6.4
Low Range: Heavy pulling, basic operational speeds less
than 7 MPH, riding through rough terrain (swamps, mountains,
etc.), low ground speeds.
High Range: High ground speeds, speeds above 7 MPH.
Solutions/What to do
Shift transmission to low range during loading of the ATV to
prevent belt burning. (if equipped)
When starting out on an incline, use low range, or dismount the
ATV after first applying the park brake and perform the "K"
turn.
Drive at higher speed or use Low Range. (if equipped) The use
of Low Range is highly recommended for cooler PVT operating
temperatures and longer component life.
Warm engine at least 5 min., then with transmission in neutral,
advance throttle to approx. 1/8 throttle in short bursts, 5 to 7
times. The belt will become more flexible and prevent belt
burning.
Fast, effective use of the throttle for efficient engagement.
Continuous operation at the point of engagement (initial vehicle
movement) increases PVT temperatures and component wear.
Use Low Range only. (if equipped)
Use Low Range only. (if equipped)
Shift the transmission to Low Range (if equipped), carefully
use fast, aggressive throttle application to engage clutch.
Warning: Excessive throttle may cause loss of control
and vehicle overturn.
Shift the transmission to Low Range (if equipped), carefully
use fast, aggressive, throttle application to engage clutch.
Warning: Excessive throttle may cause loss of control
and vehicle overturn.
Shift the transmission to neutral. Using the throttle, vary the
engine rpm from idle to 3/4 throttle. Engage transmission in
the lowest possible range (if equipped) and test for belt slip-
page Repeat several times as required. During this proce-
dure, the throttle should not be held at the full position
for more than 10 seconds. PVT seals should be inspected
for damage if repeated leaking occurs.
Inspection/repair of clutch components should be performed by
a certified Polaris MSD techinician.