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47 8N Jumps out of first gear

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Bill (VA)

06-09-1999 22:37:19




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My 8N will often pop out of first gear. It feels like a detent is worn. Is this a difficult thing to repair?




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Tim B

06-10-1999 12:48:22




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 Re: 47 8N Jumps out of first gear in reply to Bill (VA) , 06-09-1999 22:37:19  
My 52 8N will pop out of gear on deceleration but only with a very heavy load. (couple cords of red oak) I recently had the trans cover off installing a new starter switch. My gears looked brand new but the bottom of the shifter and the detents showed alot of wear. Its my guess that this is my problem. First gear is probly not being totally engaged. The good news is it looks like a simple fix. Hope this helps.

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ZANE

06-10-1999 05:51:33




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 Re: 47 8N Jumps out of first gear in reply to Bill (VA) , 06-09-1999 22:37:19  
It could be that your detent is at fault but it has been my experiance that when a straight shift transmission begins to jump out of gear it is because of badly worn parts in the transmission itself.Such as worn gear teeth or the inside portion of the gear where it slides to make up with another gear when a range is selected or worn bearing and bushings.If you cannot hold it in gear while under power then the detent is not going to be the culprit in my opinion.
The old Caterpillar transmissions had a positive locking mechanism to hold the shift rails in their proper place. It was not simply a detent but when the clutch was engauged it rotated an ex centric shaft that actually locked the shift rails into position and held them till the clutch was released. You could not shift the transmissison even if the engine were not running untill the clutch was disengauged.
Even with this positive locking system if the transmission parts themselves became worn the transmission could jump out of gear through sheer power of the thrust of the worn gear and or bearing parts.There would be a terrible noise and the locking mechanism was still trying to hold it in gear when in reality the gears were no longer in mesh but just clashing with one another.
The way to fix a transmission that is jumping out of gear is to go into the trans and determine what needs to be replaced.This needs to be done by someone who can recognize a problem when he sees it.

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llamas

06-10-1999 05:04:38




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 Re: 47 8N Jumps out of first gear in reply to Bill (VA) , 06-09-1999 22:37:19  
It's possible that a detent has gone out. But it's much more likely that the shifter mechanism is at fault. Oftentimes, a worn shifter will not slide the selector far enough to properly engage the detent, and this is the effect you will see.

If the shifter is flopping around in the transmission cover, and the cross pin is all worn and battered, and you have trouble finding gears, that's where I'd look. The shift lever should move freely, but precisely, to any selection, and there should be considerable spring resistance when you pull up on the lever. If the shift lever itself is not worn, the shifter basket spring may be weak or broken, or one of the basket pivots may have broken off the inside of the cover.

Unfortunately, to get to this, you need to remove the hood, the steering column and steering gear and sundry and various other stuff. If the shifter is shot, I don't know of a source for a new one. You can either start shopping boneyards or get ready to build it back up by welding, then shaping to fit. Oftentimes, the spherical socket in the transmission cover is all worn out as well, so you may be looking for a cover in the same boneyard.

But - if it's not the shifter - you need to remove all this stuff anyway to get to the top of the transmission and inspect the detents.

llater,

llamas

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E. Allison

06-11-1999 07:00:01




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 Re: Re: 47 8N Jumps out of first gear in reply to llamas, 06-10-1999 05:04:38  
You can remove all the shifter parts but the shift rails from the top of the tranny by removing only the transmission top cover. In my experience the shift rail is at fault. The shift rail detent for 1st is at the top of the tranny where it gets no lube. The detent ball wears a groove in it. This rail can be replaced by spliting the tractor. It may be possible to get the rail out by removing the hydraulic lift cover without splitting the tractor. I haven't tried this. Regards, EEA

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Bill (VA)

06-10-1999 06:41:06




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 Re: Re: 47 8N Jumps out of first gear in reply to llamas, 06-10-1999 05:04:38  
Thanks for the info! This board is great! This problem only happens in first gear and usually only when decelerating. There are no odd noises and no problem getting it in or out of gear. All other gears seem to work normally. If it were something simple I would look into it more but it has not bothered me enough to tear all the superstructure off.. I only have the one tractor right now.. this is a good excuse to get a second one (grin).
Thanks again.

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