Ski-Doo Hyfax

Dear Ralph:
I have a 2002 Ski-Doo and would like to remove and replace the sliders (hyfax). Can you explain the easiest way to do this? And if so, how difficult is this procedure (tools etc)? Thanks for your time on this matter.
rsavy (via e-mail)

Ski-Doo tracks have smaller windows than you’ll find on tracks used by the others, so you can’t replace the hyfax by sliding them out the rear of the track through a window unless you take a razor knife and trim two of the windows slightly wider. Only the 2006 Summit models have windows large enough to change the hyfax without removing the suspension.

This is primarily a safety and durability issue, as the larger track windows tend to increase the likelihood of catching an open window with the front end of the rails. Yes, you would have to hit the right bump very hard and have a very particular set of conditions, but this is why Ski-Doo has smaller track windows that do not allow the hyfax to be replaced as on the other brands.

So, unless you widen a couple of the windows, you will need to remove the rear suspension to replace the hyfax. There are four bolts, two per side, that hold the suspension into the tunnel. These bolts are all secured with thread locking compound, so you’ll need a good air wrench, hand tools are not going to get it done. Once all of the bolts are removed, you need to swing the track and suspension perpendicular to the tunnel and lift the suspension out of the sled. This can be done with the sled on its side, or better yet by raising the rear of the sled up and letting the track and suspension drop out. Once the track is at a 90-degree angle to the sled, the suspension will have enough clearance to come out of the tunnel.

With the suspension out, you can easily replace the hyfax. This is a good time to fully service the suspension, closely inspecting the torque arms for cracks or stress, and the rails. Lube all pivots, service or replace bearings as needed, pretty much whatever it takes so you don’t have to pull the skid before the hyfax needs to be replaced again.

When you put the suspension back in, it is often easier if you use a tie-down strap to slightly compress the rear torque arm so it’ll go back into the track. Install the front bolts first, then the rear. Use thread locking compound, and torque to spec.

Much of this will require a good working knowledge of snowmobile mechanics, so if you are inexperienced or lack the tools or knowledge, take it to your dealer so they can ensure continued safe and reliable operation of your scooter. These simplified instructions are by no means complete, nor are they a substitute for common sense or training!