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Oliver 77 clutch question..

L

Low96hb

Member
I just got my 77 running after some carb work and took it for a drive. I noticed some noice comming from inside the bell housing. After checking this out with some help we found that the shaft from the clutch back to the transmission shakes. I bought this tractior not running so here is my 1st problem with it. I have never been into one of these, what could I expect find as I work my way into this? Is ther a common part that is known to fail or just some part failure? Thanks Scott
 
That drive shaft slides into a brass pilot bushing in the center of the flywheel. Most likely,that bushing is bad. Not TOO bad to change. You have to pull the PTO shaft out the back,take the fan off,unbolt the motor mounts and slide the engine ahead and to the side to get the driveshaft out and the bell housing off.
 
When do you have the noise? As Randy mentioned below it is common for those shafts to shake. If the noise is caused by a dry pilot bearing you may get lucky by oiling it till you need to do some other work. Also how much free travel does your clutch have and does it have a clutch petal return spring? Now does your tractor have the gearbox for a belt pulley?
 
(quoted from post at 18:38:18 08/03/10) When do you have the noise? As Randy mentioned below it is common for those shafts to shake. If the noise is caused by a dry pilot bearing you may get lucky by oiling it till you need to do some other work. Also how much free travel does your clutch have and does it have a clutch petal return spring? Now does your tractor have the gearbox for a belt pulley?
Click to expand...

It makes the noise when it is in gear and is being driven. It makes the whole clutch petal shake.When the tractor is setting still you can grab the shaft and move it from side to side about 1/16 of an inch or so. But to watch it in gear and to see it under pressure It looks a lot worse than that..
 
Which end of it wiggles,the end toward the bell housing or the end toward the coupler in the rear? That coupler shouldn't have any play in it either. It clamps to the shaft at the front of it and has a set screw in back where it slides on the transmission input shaft.
 
(quoted from post at 19:34:23 08/03/10) Which end of it wiggles,the end toward the bell housing or the end toward the coupler in the rear? That coupler shouldn't have any play in it either. It clamps to the shaft at the front of it and has a set screw in back where it slides on the transmission input shaft.
Click to expand...

Yea the end towards the bell housing is the worst, but both have a little play. The guy I got it from told me he put a new clutch in it, could be that he didn't tighten the pressure plats bolts tight enough? It makes a loud ratteling sound........... :?:
 
I replaced a pilot bearing in a 77 a few years ago and it only made noise when the clutch was depressed. It did not make noise when it was moving. could it be the clutch throw out bearing?
 
(quoted from post at 09:31:01 08/03/10) That drive shaft slides into a brass pilot bushing in the center of the flywheel. Most likely,that bushing is bad. Not TOO bad to change. You have to pull the PTO shaft out the back,take the fan off,unbolt the motor mounts and slide the engine ahead and to the side to get the driveshaft out and the bell housing off.
Click to expand...

I never touched the engine when I replaced the bushing. Remove gas tank, steering shaft and all the wiring.
Pull the PTO shaft out far enough, Take off the driveshaft connector, slide back the bellhousing and with a little wiggling, the bellhousing should come with the driveshaft still in it. If you remove the clutch , theres a thick metal plate bolted up to the flywheel in the middle (It uses the flywheel bolts if I remember correctly). It should have splines in it that match the PTO drive, and also a bushing (or lack thereof) that the driveshaft sits in if it were all together. Thats where the bushing goes, and its pressed in. To low96, If you get a new bushing made, don't forget to have the driveshaft turned so its round, or you'll be back into the bellhousing before year-end.
 
Before you spend money on a getting a bushing made, find a ball bearing hub and shaft out of a later tractor. We used to also oil those bushings as a temporary fix.
 
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