03-10-2025, 03:11 PM
(This post was last modified: 03-10-2025, 03:15 PM by MrShane.
Edit Reason: Spelling correction
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(03-10-2025, 02:48 PM)SkunkedAgain Wrote: Good job Matt, glad you got out and had some fun and helped out along the way, bet it was much appreciated.... So if my vernacular is correct the jack shaft on the snowmobile is the driven shaft that has the secondary clutch on it, opposite end goes into the gearbox that takes the power to the track... If they call it the same thing on the snowdogs... That would really shut you down and put you in need of a tug... I'll be the slush didn't make pulling a dog home very easy... Glad you had the new sled with a little more get up and go... Later J
You defined it almost perfectly Jeff.
The jack shaft typically either changes the drive type usually from a belt driven force, through a solid steel shaft, to usually drive a chain.
Most Snow dogs use a variable speed clutch (belt driven) on the engine side, to the jack shaft.
Then on other side of jackshaft is usually chain or gearbox down to drive the track.
The weakest part of the jackshaft assembly is the two milled keyways on each end of jackshaft.
The keyway MUST be in good condition with the correct key installed or a failure is just begging to happen.
Neither the driven pulley (secondary) or the gear on the other side can be allowed to move laterally on that keyway or you are walking home.
If the bolts holding the bracket that supports the jackshaft and bearings wiggle or come loose, you will also be walking back very soon.