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Old 03-03-2011, 08:00 PM   #1
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Rear suspension sag

I have a 2001 440Z. The rear suspension sags probably 4 inches under its own weight, lots more when I sit on it. the preload adjusters are set for maximum preload. Do the two rear springs go bad, or is the shock gone bad? Maybe both?

Can I determine what's wrong without dropping the skid frame?
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Old 03-03-2011, 08:18 PM   #2
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Is that with your sled sitting on flat level ground? Skis and track on the ground? Some times if the weight is just right under the track or on a hill or the skis on carts and the track not on a cart, the rear suspension will free sag a few inches. If not any of the above stuff it is very possible that the springs or shocks are bad.
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Old 03-04-2011, 06:11 AM   #3
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The sled's sitting level. I just bought it and I'll need to do some work on it. My question is basically how do I test the springs or shock? I'm assuming I need to order new parts, drop the skid frame, replace the spring & shock, reassemble & see if it's fixed. I thought someone might have been through this & be able to offer some tips to save me time.
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Old 03-04-2011, 11:19 AM   #4
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If they are fox shocks have them recharged. Springs can get weak, but shocks are the culprit most of the time.
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Old 03-04-2011, 11:32 AM   #5
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I rebuilt my rear suspension last summer. There seemed to be almost no suspension left before I started. I found that the shock was obviously bad when i could compress it by hand with no resistance felt. I also replaced the springs, hyfax, and several bearings as long as I had it apart. Now it is as good as the day it was new. PITA to install back in the sled, though!


BTW, I have a 2001 Z440 as well. (green one in my avatar pic)
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Old 03-04-2011, 12:40 PM   #6
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While you may need the shocks rebuilt, it's the torsion springs that hold the sled up. The shocks provide dampening and prevent bottoming out, but they do not provide lift. I would start with a new set of torsion springs. If you are a big boy, you might want to look at the heavier ones, but if you are under 200 lbs, a fresh set of standard springs should fix the sag problem.
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Old 03-04-2011, 03:39 PM   #7
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its the shocks all the way, when springs go bad they are just spongier.
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Old 03-04-2011, 04:01 PM   #8
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Q - Do the shocks on your car hold it up?
A - No, they don't. Not a chance.

So why would you think that the shock on a snowmobile is used to hold the weight of the sled? The shocks main purpose is to dampen the bumps and jolts from riding, not to hold the sled up. They also play the main role in determining the "stiffness" of the ride because of the way they are valved. Basically how quickly they respond to movement. Gas charged shocks do provide a little help to the springs but it is minimal at best. The springs are what control the sag of the suspension.
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Old 03-04-2011, 04:27 PM   #9
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Sled: 2008 F570, 2010 F5LXR
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So basically I need to drop the skid frame & replace the rear springs & may as well change out both shocks. I'm well under 200 lbs, so I'll go stock replacements.
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Old 03-05-2011, 08:00 AM   #10
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 Quote: Originally Posted by 109jb View Post
Q - Do the shocks on your car hold it up?
A - No, they don't. Not a chance.

So why would you think that the shock on a snowmobile is used to hold the weight of the sled? The shocks main purpose is to dampen the bumps and jolts from riding, not to hold the sled up. They also play the main role in determining the "stiffness" of the ride because of the way they are valved. Basically how quickly they respond to movement. Gas charged shocks do provide a little help to the springs but it is minimal at best. The springs are what control the sag of the suspension.
So I guess I'll run out to my car and adjust the preload so it goes from a New Yorker to a Porche! There is a Big difference between car and snowmobile suspensions, and I still side on it is the shocks, I had this problem and the shocks were stiff but they did not return(they were stiff both ways,the return was gone) so my sled "appeared" to SAG! when REALLY the shocks were not doing HALF of THEIR JOB!!!
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