Drivetrain/Track/Brake Systems This section has been organized into sub-sections for servicing drivetrain, track, and brake systems; however, some components may vary from model to model. The technician should use discretion and sound judgment when removing and installing components. NOTE: Whenever a part is worn excessively,
cracked, or damaged in any way, replacement is necessary.
NOTE: A stiff belt causes a HP loss to the track. As a belt warms up, it gets more flexible and transmits power with less HP loss. NOTE: When installing a new drive belt, see After
Break-In Checkup/Checklist — Drive Belt Break-In in the General Information/Foreword section.
REMOVING
1. With the engine off, remove the left-side access panel. Loosen the 1/4 turn on the lower console. 2. Remove the cap screw, washers and sheave adjuster from the end of the driven clutch; then remove the cap screw, lock washer, and washer from the adjuster. NOTE: Ensure that the shims and O-ring are not
SPECIAL TOOLS
A number of special tools must be available to the technician when servicing the drivetrain, track, and brake systems.
removed from the adjuster.
NOTE: When indicated for use, each special tool
will be identified by its specific name, as shown in the chart below, and capitalized. Description
p/n
Drive Clutch Bolt Tool
0644-281
Drive Belt Deflection Tool
0644-424
Bearing Removal and Installation Tool
0644-167
Movable Sheave Bearing Tool
0644-594
Clutch Alignment Bar
0644-496
Drive Clutch Puller
0744-062
Drive Clutch Spanner Wrench
0644-136
Driven Clutch Compressor Tool
0644-444
Rear Suspension Spring Tool
0144-311
Brake Caliper Bearing Puller
0744-067
0743-395
3. Reverse the adjuster and install the cap screw without washers into the adjuster. Install the sheave adjuster and cap screw onto the driven clutch; then tighten the cap screw until the movable sheave opens far enough to allow the belt to be removed.
NOTE: Special tools are available from the Arctic
4. Remove the drive belt from the driven clutch first; then from the drive clutch.
CAUTION
NOTE: Each time the driven clutch cap screw is removed, the hole in the driven shaft should be cleaned free of any Loctite residue.
Cat Service Parts Department.
Never attempt to substitute any other drive clutch puller for the recommended puller or severe clutch damage will occur.
Drive Belt If the drive belt is longer than specified, the drive clutch and driven clutch will not achieve full shift ratio. This will result in poor acceleration and a decrease in top speed. If the drive belt is shorter than specified, the starting ratio will be higher causing the belt to slip. A too-short drive belt will cause a bog on engagement and will not allow the engine to reach peak RPM. NOTE: A thinly worn drive belt may produce the
same effect as one that is too long.
INSTALLING
CAUTION Before securing the driven clutch, be sure the rollers are up against the torque bracket or damage to the back-side cams may occur.
1. Place the drive belt (so the arrow is pointing toward the front of the snowmobile) in the drive clutch; then between the sheaves of the driven clutch. 2. Install the sheave adjuster in its original position (beveled side out); then install the cap screw, lock washer, and washer into the driven clutch. Tighten the cap screw (threads coated with blue Loctite #243) to 20 ft-lb. 3. Secure the left-side console and access panel,
! WARNING Never operate the snowmobile without the guard/access panel secured in place.
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