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Old 08-08-2011, 08:22 AM   #1
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Replacing jack Shaft Bearing

First let me say that I am new to snowmobiles, I am familiar with ATVís but I just bought this snowmobile in February so if I misstate anything please correct me.

I have a 2007 Z570 that Iíve ridden once and at the end of our ride it started making a clanging noise and losing power, so we towed it the rest of the way back and parked it. We suspected at the time it may be the jack shaft bearing as you could pick up the jack shaft by the brake rotor and move it freely. This weekend I finally tore it apart, drained the chain case and removed the cover and as I suspected it looks like the bearing is the problem. The shaft and top sprocket move around keeping the chain from having any tension. I have not gone any further than taking the cover off of the chain case, the sprocket it still attached to the shaft. So my question is what is the best way to replace the bearing? Does the shaft have to come out to replace it? If so how much work is it to remove the shaft, it looks like it could be a bitch. Also is there anything else I should check or replace while I am in there?

Thanks!
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Old 08-08-2011, 12:18 PM   #2
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When I replaced my bearings I left the shaft in it. I just removed the nuts off the bolts on the triangle bearing plate (#24) and took off the bearing and replaced with a new one. I would recommend doing the other side as well.
That one will have a locking collar (#20) on it that will need to be turned with a punch to rotate it off the bearing so it will come off the shaft. This will be on the other end of the shaft by the secondary clutch. It is the second pic.
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Old 08-08-2011, 06:35 PM   #3
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X2, do the other side while you have it tore apart. Look in the "Pinned" section. There is a few tips on removing tracks and it covers taking the chain case apart to remove the track.
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Old 08-08-2011, 07:15 PM   #4
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Keep in mind that if the secondary clutch is seized onto the jackshaft...it will make the otherwise simple bearing change that much more fun.

I had to pull the side panel, pull the entire jack shaft out, press the clutch off the shaft at a local garage...all to get to the bearing!
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Old 08-09-2011, 07:23 AM   #5
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 Quote: Originally Posted by snow pro View Post
Keep in mind that if the secondary clutch is seized onto the jackshaft...it will make the otherwise simple bearing change that much more fun.

I had to pull the side panel, pull the entire jack shaft out, press the clutch off the shaft at a local garage...all to get to the bearing!

X2..a good time can be had by all if the clutch is seized on...
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Old 08-09-2011, 09:16 AM   #6
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Just did the jackshaft bearings on both sides when doing my summer overhaul. Secondary clutch was not seized on but the clutch side bearing was practically welded to the shaft. Thanks to a friend who has a press, and one growler of beer later, I'm reinstalling soon. Don't forget to clean up the shaft a bit and lubricate it with a dry graphite.
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