super 99 GM

hrRoss

Member
have a s99 GM, tore out the clutch disc hub for the second time. now i know that i have a problem, not sure if its a alighnment problem with the motor? any suggestions
 
Does the tractor move at all before this happens? Almost sounds like it's stuck in 2 gears
We need more info on what's happening right from the install till the time it breaks
 
it was 2 years since i put the last clutch plate in, origanally had 12" clutch and i dont know how long it was in the tractor, i had it maybe 10 years. tore the hub out while at plow day plowing. took it out and sent to clutch rebuilder and requested a 14" in clutch as that was what the service book recomened for the gm diesel. the 14" plate was quite a bit heavier, thought it would never break. it broke again plowing at a show, stopped dead in its tracks. no it wasnt in 2 gears at once. had been plowing for about a hour. i also take it to 1-2 tractor pulls a year also. this is not a high hp tractor, about 95hp on dyno. the rebuilder sent it back this time, no rebuild, assuming they dont have the 16 spline center hub, as this one is showing wear. havent found a replacement yet
 
First thing you need to do is make sure your flywheel face is perpendicular to the center line of the crank. Then check to see if the flywheel is off center (i.e. the flywheel and crank do no share the same axis) All this is accomplished with a dial indicator. I have attached a photo on how this is done. If these measurements check OK, then move to checking engine/transmission mis-alignment.

I have seen this happen when the flywheel has come loose and the crank & flywheel weren't refaced. The flywheel was just retightened on uneven worn surfaces which is the cause of your problem. It is a good idea to machine the crank/flywheel mating surfaces and clutch side.
a202110.jpg
 

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