Polaris Trail Boss 330 2003 Service Manual page 42

MAINTENANCE
After inspection, again slowly move the ATV forward
until all the chain slack is on the top side of the chain
and inspect the deflection. Repeat this procedure
several times to check different spots on the chain.
The chain is correctly adjusted when the tightest
portion of the chain itself has approximately 3/8 in.,
(10 mm) of deflection. It's a common characteristic of
any chain to have one or more tight spots in the chain.
Therefore, it is extremely important to check chain
deflection in several areas of the chain to ensure
deflection is correct at the tightest point.
ADJUSTMENT PROCEDURE -
CONCENTRIC SWINGARM
1. Loosen chain guide.
2. Loosen the two (2) eccentric clamp bolts.
3. Loosen caliper mounting bracket bolts located
under the axle.
See illustration for bolt locations.
3/8² (10 mm) Deflection
Loosen Eccentric
clamp bolts (Step 2)
Loosen (2) caliper
mounting bracket
bolts (Step 3)
4. Insert a pin punch through the sprocket hub and
into the eccentric axle housing.
5. Move the ATV forward or back to move the
eccentric housing and adjust to the proper tension
(Approximately: 3/8" , or 10 mm)
6. Tighten the eccentric clamp bolts to specification.
Eccentric Clamp With Hitch
WITH TRAILER HITCH -
Pin Punch
Torque the nut
45 ft. lbs. (61 Nm)
2.25