Snowmobile Arctic Cat (2008 year). Manual - part 91

6-8

REMOVING BEARINGS

To remove driven pulley bearings, use the Bearing

Removal and Installation Tool and the following pro-

cedure.

„NOTE: To remove the movable sheave bearing,
heat must be applied around the bearing.

1. Place the movable sheave (or roller plate) flat on a

press.

2. Using the bearing tool, press the bearing out.

AF154

INSTALLING BEARINGS

„NOTE: Before installing a bearing, apply red Loc-
tite #271 to the outside face of the bearing.

1. Place the movable sheave (or roller plate) flat on a

press.

2. Using the bearing tool, press the bearing into posi-

tion. The bearing must be flush with the outside of

the bearing boss.

3. Wipe off excess Loctite. Allow the Loctite to cure

for 24 hours at room temperature.

ASSEMBLING

1. Place the roller and thrust washer (toward the out-

side of the roller plate) and secure with the roller

pin.

2. Secure the roller, thrust washer, and pin into posi-

tion with the spring pin. Drive the pin in until it is

flush with the plate.

SC012D

3. Place the torque bracket (cam) into position on the

stationary sheave making sure the degree number

on the bracket aligns with the part number on the

stationary sheave. Install the three socket head

screws and lock washers. DO NOT tighten at this

time.

AI062

4. Place any thrust washers (as noted during disas-

sembly) on the stationary sheave shaft.

B460

5. Align the scribed line made during disassembly;

then slide the movable sheave onto the stationary

sheave shaft.

! WARNING

Always wear safety glasses when using the bearing
driver.

6-9

6

B459D

6. Place the sheaves on a work fixture (roll of duct

tape, etc.).

7. Place the spring over the stationary sheave hub

and hook the turned down end of the spring into

the hole in the casting of the stationary sheave.

B458D

8. Place the roller plate over the spring and hook the

turned-up end of the spring in the 3rd hole (stan-

dard spring tension) of the plate.

9. While holding the sheaves to prevent them from

rotating, grasp the roller plate and rotate it approx-

imately 120° clockwise until the mounting holes

align; then push the plate into position and install

the three lock nuts. Tighten the lock nuts to 20 ft-

lb.

„NOTE: The line scribed during disassembly
should be aligned.

SC003D

10. Rotate the movable sheave to ensure free move-

ment without binding.

11. Rotate the torque bracket (cam) until it is tight;

then using a long hex wrench, tighten the three

socket-head cap screws (from step 3) securing the

bracket to 65 in.-lb.

SC011D

INSTALLING

1. Slide the alignment washers onto the end of the

driven shaft.

2. Install the key in the driven shaft keyway; then

place the stub shaft into the driven pulley. Place

the driven pulley on the shaft. Align its keyway

with the driven shaft keyway.

„NOTE: A small amount of Loctite Anti-Seize
Thread Compound applied to the driven shaft will
aid in future driven pulley removal.

3. Secure the driven pulley by installing any align-

ment washers, the washer, and cap screw (coated

with blue Loctite #243). Tighten the cap screw to

24 ft-lb.

SC013D

4. Check drive clutch/driven pulley alignment (see

Drive Clutch/Driven Pulley in this section); adjust

as necessary.

5. Install the drive belt and check drive belt deflec-

tion (see Drive Clutch/Driven Pulley in this sec-

tion). Secure the belt guard.

6-10

Drive Clutch/

Driven Pulley 

(STD)

CHECKING OFFSET

If premature drive belt wear is experienced or if the

drive belt turns over, parallelism/offset must be

checked. Also, parallelism/offset must be checked

whenever either the drive clutch or driven pulley is

serviced. To check the parallelism/offset, use the

Clutch Alignment Bar and the following procedure.

1. Open the belt guard and remove the drive belt.

2. Install the clutch alignment bar between the drive

clutch sheaves and against the outside edge of the

driven pulley stationary sheave.

3. Allow the alignment bar to rest on the drive clutch

shaft.

0733-912

„NOTE: The alignment bar must extend beyond
the front edge of the drive clutch.

4. With the bar against the outside edge of the driven

pulley stationary sheave at points A and B, the bar

should just clear the inside edge of the stationary

sheave of the drive clutch and rest on the station-

ary shaft. If the bar does not clear the inside edge

or is more than 1.5 mm (0.060 in.) from the inside

edge, the offset must be corrected.

AF465D

733-912B

CORRECTING OFFSET

1. To correct offset, the driven pulley must be moved

laterally on the driven shaft. Remove the cap

screw and washers securing the driven pulley; then

remove the driven pulley.

„NOTE: If the driven pulley is tight on the driven
shaft, pull the driven pulley off using the Driven
Pulley Puller.

2. To move the driven pulley inward on the shaft,

remove washer(s) as required from behind the pul-

ley.

3. To move the driven pulley outward on the shaft,

add alignment washer(s) as required behind the

driven pulley.

„NOTE: Make sure the keyways match when
installing the driven pulley. Arrange washers to
allow the least amount of “float” on the driven
shaft. A maximum of 1.5 mm (0.060 in.) of float is
acceptable.

4. Install the driven pulley and secure with a cap

screw and washers. Tighten the cap screw to spec-

ifications.

CHECKING PARALLELISM

1. Check parallelism of the drive clutch/driven pulley

using the alignment bar and reference points X and

Y with the alignment bar against the driven pulley

at points A and B. Using a calipers or a machinist's

scale, measure X and Y from the back side of the

alignment bar. Measurements X and Y must be

equal or measurement Y must be more than mea-

surement X, but Y must not exceed measurement

X by more than 1.6 mm (0.062 in.).

6-11

6

733-912A

AF041

„NOTE: The offset must be correct before check-
ing parallelism.

2. If parallelism is not within specifications, the par-

allelism must be corrected.

CORRECTING PARALLELISM 
(Torque Bumper w/Bearing 

Support Bracket)

1. To correct parallelism, minor adjustments can be

made by adjusting the torque bumper on the left-

rear engine mount.

A. Loosen the cap screws and nuts securing the

engine mounting brackets to the front end.

B. Using the jam nuts on the torque bumper, adjust

parallelism and periodically check the parallel-

ism. When the parallelism is correct, tighten the

cap screws and nuts securing the engine mount-

ing brackets to the front end; then tighten the

torque bumper jam nuts allowing 1.5 mm

(0.060 in.) clearance between the torque

bumper and the engine.

AN610D

2. Recheck both offset and parallelism to ensure

accuracy and make further adjustments as neces-

sary.

„NOTE: After parallelism and offset have been
corrected, check for proper drive belt deflection.
This is critical for optimum performance.

CORRECTING PARALLELISM 
(Engine Snubber w/Engine Plate)

1. To correct parallelism, minor adjustments can be

made by adjusting the engine snubber on the left-

rear engine mount.

A. Loosen the cap screws securing the engine plate

to the engine mounts.

B. Either lengthen or shorten the snubber and peri-

odically check the parallelism measurement.

When the parallelism measurement is correct,

loosen the snubber to allow 1.5 mm (0.060 in.)

clearance between the snubber and the engine;

then lock the jam nuts on the snubber and

tighten the cap screws securing the engine

plate.

2. Recheck both offset and parallelism to ensure

accuracy and make further adjustments as neces-

sary.

„NOTE: After parallelism and offset have been
corrected, check for proper drive belt deflection.
This is critical for optimum performance.

DRIVE BELT DEFLECTION

Drive belt length, condition, and deflection are all

important for peak performance. To check and adjust

drive belt deflection, use the following procedure.

1. Turn the engine off; then open the belt guard.

2. Make sure the drive belt is sitting at the top of the

driven pulley sheaves.

3. Place a straightedge on top of the drive belt. The

straightedge should reach from the drive clutch to

the top of the driven pulley.