Supertraxmag, Procross Suspension article - HCS Snowmobile Forums

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Old 03-16-2012, 09:12 AM   #1 (permalink)
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Default Supertraxmag, Procross Suspension article

Did anyone read this from Supertrax? Wonder if that is a typo, below in bold, could it be correct? Seems insane as compared to the 20lbs of the F series.




If you found your 2012 ProCross Cat tended to "pack up" about two-thirds of the way through its suspension travel, we may have a fix for you.

We found this tendency ourselves and were a bit frustrated this winter trying to get the skid to use its full travel and take advantage of its shocks' ability to dampen.

It actually felt like it was bottoming out all the time - a tendency we never experienced at all on the early 2012 Cat protos we rode a year ago.

This was especially noticeable on Sno-Pro models where there are no damping adjusters on the skid shocks and the calibration seems to be overly stiff anyway.

Our LXR press sled did the same "packing thing" but because the shocks are set to be more compliant, we could live with it much better. Still not as good as we knew it could be!

According to the Cat engineers, here's the fix: Apparently, the 128-inch track on the Procross tends to be too tight. Since the track doesn't have enough deflection when set at what would be normal adjustment other years, when it gets past the halfway point in its travel, the track goes way tight and resists movement through the rest of its travel.

If you've noticed this stiffness (almost like the sled is bottoming out - call it "soft bottoming"), you need to back off your adjusters so the track is hanging down 1.5 inches with 110 pounds pressure measured halfway down the rail.

Make sure you've set your pull scale from the center of the track, not the outside edge, when measuring deflection.

Apparently, a looser track allows the ProCross skid to deliver everything you paid for.
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Old 03-16-2012, 09:26 AM   #2 (permalink)
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110 lbs? That seems excessive.
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Old 03-16-2012, 09:30 AM   #3 (permalink)
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I would never of thought to run the track that tight. Maybe that is why I never really thought it rode stiff.
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Old 03-16-2012, 09:32 AM   #4 (permalink)
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it must be a typo id say 10 lbs. regardless it could explain a few things such as slider wear.
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Old 03-16-2012, 11:07 AM   #5 (permalink)
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Typo, should be 10 lbs
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Old 03-16-2012, 11:17 AM   #6 (permalink)
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What does the owners / service manual say?
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Old 03-16-2012, 11:39 AM   #7 (permalink)
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I always run mine much looser than the manual. I think it says 1-1.5 under 20 lbs of tension.

I'm running that deflection under NO tension.... but i'm not studded.

My problem was the small chop, not the big stuff
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Old 03-16-2012, 12:08 PM   #8 (permalink)
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I felt this with mine and never could really get tid of it. I was more worried about the tracck ratcheting. I will play with this next year.

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Old 03-16-2012, 02:33 PM   #9 (permalink)
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I'm reading my spec sheet for F800 and track deflection is: 2-2 1/4" @ 20 lbs.
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Old 03-16-2012, 03:19 PM   #10 (permalink)
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I'm reading my spec sheet for F800 and track deflection is: 2-2 1/4" @ 20 lbs.
Hmmm. maybe i should make mine 2.25" deflection with 0 lbs. I was told a long time ago to run it as loose as possible w/out ratcheting.
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