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Öhlins Racing AB, Box 722, S-194 27 Upplands Väsby, Sweden.
Phone +46 8 590 025 00. Fax +46 8 590 025 80.
www.ohlins.com
AC 631, issued 2005 12 28
Mounting Instructions
Öhlins shock absorber kit AC 631
for Arctic Cat 440 - center
© Öhlins Racing AB. All rights reserved. Any reprinting or unauthorized use without the
written permission of Öhlins Racing AB is prohibited. Printed in Sweden.
Kit Contents
Before installing the shock absorber, please
check the contents of the kit. If anything is
missing, please contact your Öhlins dealer.
Part number
Shock absorber 46PRX AC631 (1)
C-spanner 00710-02 (1)
Sticker Öhlins 00197-01 (2)
Sticker memo notes 01180-01 (1)
Owner’s manual (1)
Before Installing
Öhlins Racing AB cannot be held responsible
for any damage to shock absorber or vehicle,
or injury to persons, if the instructions for fi tting
and main tenance are not followed exactly.
Similarly, the warranty will become null and
void if the instructions are not adhered to.
Öhlins products are subject to continuous
improvement and development. Conse-
quently, although these instructions include
the most up-to-date information available
at the time of printing, there may be minor
differences between your shock absorber
and this manual. Please consult your Öhlins
dealer if you have any questions regarding
the contents of this manual.
Spring pre-load
Adjust the spring pre-load by turning the rings
on the cylinder house. Use a C-spanner.
Compression damping:
Adjustments are made on top of the reservoir.
Low speed adjustments: Slotted centre screw.
High speed adjustments: Hexagon screw.
Rebound damping
Adjuster wheel on the piston shaft above the
end bracket.
NOTE!
When delivered the Öhlins shock absorber is
dialed to recommended settings for the spe-
cifi c brand and make of the snowmobile. If you
have changed the setting, reset according to
the following:
The adjusters have a normal right hand thread.
Turn clockwise to fully closed. Turn counter
clockwise to open and count the clicks until you
reach the recommended number.
Rebound
adjuster
Spring pre-load
adjuster
Low speed
compression
adjustment
High speed
compression
adjustment
Adjustments
Shock absorber length 304.5 mm
Shock absorber stroke 84.5 mm
Spring rate 34 N/mm
Free spring length 150 mm
Spring pre-load 5 mm
Low speed comp. damping 15 clicks
High speed comp. damping 1 turn
Rebound damping adj. 20 clicks
Setup data
CAUTION!
Do not use too much force, delicate sealing sur-
faces can be damaged. Do use fi ngers only.
Read more about settings and adjustments in
your Öhlins Owner’s manual.
16
Reinstall the limiter strap screws. See step 1
and 2 for safe procedure.
17
Read more about the Öhlins shock absorber in
the Öhlins owners manual.
NOTE!
Make sure that all bolts are tightened to the
correct torque and that nothing fouls or restricts
movement of the shock absorber when the sus-
pension is fully compressed or extended.
WARNING!
1. Installing a shock absorber, that is not
approved by the vehicle manufacturer, may
affect the stability of your vehicle. Öhlins
Racing AB cannot be held responsible for
any personal injury or damage that may oc-
cur after fi tting the shock absorber. Contact
an Öhlins dealer or other qualifi ed person
for advice.
2. Please study and make certain that you fully
understand all the mounting instructions and
the owner’s manual before handling this shock
absorber kit. If you have any questions regard-
ing proper installation procedures, contact an
Öhlins dealer or other qualifi ed person.
3. The vehicle service manual must be
referred to when installing the Öhlins shock
absorber
!
NOTE!
During storage and transportation, especially
at high ambient temperature, the oil and
grease used for assembling may run out in-
side the packing and damage the expanded
polystyrene packing material. This is not
unusual and is in no way detrimental to the
shock absorber.
Mounting Instructions
Safety Signals
Important information concerning safety is
distinguished in this manual by the following
notations:
The Safety alert symbol means:
Attention! Your safety is involved.
WARNING!
Failure to follow these warning instruc-
tions could result in severe or fatal
injury to anyone working with, inspect-
ing or using the shock absorber, or to
bystanders.
CAUTION!
Caution indicates that special pre-
cautions must be taken to avoid damage
to the shock absorber.
NOTE!
Indicates information that is of importance
regarding mounting procedures.
!
!
WARNING!
1. It is advisable to have an Öhlins dealer
or other qualifi ed person install the shock
absorber.
2. Follow the instructions in the vehicle service
manual when changing the shock absorber.
3. When working on a raised vehicle, make
sure that it is securely supported to prevent
it from falling.
!
1
Compress the front part of the rear suspen-
sion so that the limiter strap is no longer
tight.
A tip: Put a large piece of wood under the front
part of the rear suspension to raise it and thereby
loosen the tension of the limiter strap.
2
Loosen the two lower screws of the limiter
straps.
3
Raise the rear end of the snowmobile so that
the track is off the ground. Make sure the
vehicle is securely supported so that it will
not fall over.
4
Loosen the rear suspension by removing the rear
screws, one on each side of the vehicle.
5
The rear suspension has two forks on top of the
front arm. Lit the fork off the axle and the rear
suspension is detached.
6
Remove the hose clamp that holds the original
shock absorber reservoir.
12
Attach the upper attachment. Use the original
screw and nut.
13
Tighten the screws of the upper and lower at-
tachments.
14
Tighten the three screws holding the slide rail.
!
1
2
6
7
8
9
press
loosen
7
Remove the upper attachment of the original
shock absorber.
NOTE!
The metal cover on the upper attachment will not
be needed for the Öhlins shock absorber.
8
Remove the lower attachment of the original
shock absorber. See figure on previous
page.
9
Loosen the three screws on the slide rail, as
indicated on the fi gure. Press the slide rail apart
and rotate the shock absorber and axle so that
the whole unit comes out. See fi gure.
10
Attach the axle, bushing, washers and the two
sleeves onto the Öhlins shock absorber.
11
Install the Öhlins shock absorber, the reservoir
on the left side. Use the original screw and nut.
Install the axle in the middle hole.
NOTE!
Attach the axle and the shock absorber in the
middle hole.
10
rotate 30° and
remove upwards
11
press
16
3
!
4
15
Put the rear suspension back into the track.
Tighten the screws, one on each side of the
vehicle.
sleeve
sleeve
washer
washer
axle
bushing
NOTE!
Attach the axle in the
middle hole!
11
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