Engine Braking Clutch; Cvt Maintenance/Inspection; Cvt Drying - Polaris Hawkeye Repair Manual

If the torque resistance at the transmission input shaft is
greater than the force through the drive belt, the driven
clutch spring forces the moveable sheave inward, and the
drive belt is forced toward the outer diameter of the
sheaves. This action, which decreases the driven clutch
speed, is called backshifting.
In situations where loads vary (such as uphill and
downhill) and throttle settings are constant, the drive and
driven clutches upshift or backshift accordingly to
maintain optimum engine RPM.
At full throttle a perfectly matched CVT maintains engine
RPM at the peak of the power curve during upshift and
backshift. In this respect, the CVT system is similar to a
conventional power governor, but it functions by varying
the load rather than by varying throttle position.

ENGINE BRAKING CLUTCH

The engine braking clutch is a one-way clutch located
inside the starting clutch hub. This clutch "locks" the
starting clutch hub to the crankshaft whenever drive belt
(and drive clutch) speeds exceed the engine RPM, such
as when travelling down hill with the throttle released,
which provides engine braking.
Refer to the ENGINE section for more information.

CVT MAINTENANCE/INSPECTION

Periodic inspection and maintenance is required to keep
the system operating at peak performance. The following
list of items should be inspected and maintained to
ensure maximum performance and service life of CVT
components. Refer to the troubleshooting checklist for
more information.
1. Drive and Driven Clutch Rollers (Weights),
Buttons and Bushings, and Driven Clutch Spring.
Inspect for wear.
2. Drive Belt. Inspect condition and width of belt.
3. Sheave Faces. Clean and inspect for wear.
4. CVT System Sealing. The CVT system is air cooled
by fins on the drive clutch stationary sheave. The fins
create a low pressure area in the CVT area, drawing
fresh air into the system through the intake air duct.
The opening for this intake duct is located at a high
point on the vehicle. All connecting air ducts and the
outer cover must be properly sealed to reduce the
chance of water ingestion into the CVT area. A sealed
CVT is especially critical on units subjected to
frequent water forging.
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CVT DRYING

NOTE: If operating the ATV through water, be sure to
check the CVT cover and other ATV components for
water ingestion. The ATV should be checked immediately.
Refer to Owner's Manual for Safe Riding Tips.
1.
NOTE: To further expel water in the CVT cover and to
dry out the CVT system, shift the transmission to neutral
and rev engine slightly to expel the moisture. This will
also air-dry the belt and clutches. Allow engine RPM to
settle to idle speed, shift transmission to lowest available
range and test for belt slippage. Repeat as needed.
Operate ATV in lowest available range for a short period
of time until CVT system is dry.
CVT TRANSMISSION
To drain any water that may be trapped inside the
CVT cover, remove the CVT drain plug located on the
bottom of the CVT cover and let the water drain out.
(The location of the CVT drain plug is shown on the
following page.)
8.5