3340 reverser troubles

[dyates]

Hello all. I have a 3340 that will not stay in reverse. Detent checked OK. Removed the top from transmission to find that the problem involves the gear for reverse that is engaged by sliding collar. There appears too much play with this gear. It doesn't wobble on the shaft, but will slide fore and aft approximately 3/16 inch. There is something, shim or bearing, made of brass between this gear and the next. My first question is what is this brass item. My second question is how big of a deal is this to fix once the tractor is split. Will the gears simply slide out over the input shaft of transmission after bearing is removed?

Thanks,
Daniel

 

[Renze]

The brass item is the synchromesh ring. Cant tell how much work, never had one of these open, shuttle reversers are rare here (unfortunately)

 

[dyates]

Thanks anyway. I wonder how much there is to this synchromesh ring. The reason I ask is that it appears I might be able to install a split shim between this ring and the reverser gear to take up the slop and solve my problem without splitting the tractor. I know that would be too good to be true but it never hurts to have hope.

 

[Renze]

It might be that the ring on the shaft is loose. We had that on the 5th gear of a 6718, the Seeger ring was missing so the collar couldnt catch the ring, and jumped off. Repair was a week of work and a 5 cent Seeger ring.

 

[dyates]

That sounds about right. At times, if I get the light just right, I can see what looks like a piece of wire still on the shaft. I wonder what the odds are the ring would be intact and I could run a piece of wire behind it like dental floss and get it back home.

 

[forterra9641]

Renze, the shuttle reverser gear on these tractors is not synchronized
so i dont think it is a synchromesh ring he is seeing.

 

[dyates]

I went to my local "dealer" and looked at their service manual . No synchro ring, but Renze is still probably correct. Just a ring and an insert held in place by a snap ring that all stops the gear from sliding on the shaft. I still was unable to decipher how to get it out. Appears that I could split the tractor, remove the front cover from the gear box, and slide out the input shaft, exposing the goodies in question. Does anyone know if the input shafts on these tractors generally just slide out to the front once the front cover is removed from the gearbox?

 

[Renze]

Yes they do. You can take out the PTO gears (540/1000rpm) from the front, so i suppose the reverser gears too, as they are located in the space where normally PTO gears are located.

 

[dyates]

Thanks. I don't really want to get into this, but I guess it isn't optional. Kinda hard to use a tractor with no reverse. Wish I had waited and bought a better tractor. I don't know what the guy who had this one did to it, but I sure am tired of working on it. I know these things are built like tanks, but this one has had more things wrong with it than any one machine I have ever seen. Not knocking the brand, just the lying moron who made a sucker out of me. Maybe I'll eventually get all the kinks out of it. I'll have to use it to ever get my money's worth. No way I could ever sell it and come out at this point.

 

[Renze]

A parts manual , patience, common sense, and basic tools are all you need. Its not uncommon for synchro shuttles to break if abused by jamming it into gear while still moving at speed.

 

[dyates]

I have since split the tractor and removed the front cover from the gearbox. All parts appear to be present and in working condition from the manual . There is also the bronze spacer that I don't see on any of the parts diagrams. After the cover and hollow clutch shaft are removed, there it is. It rides on the solid clutch shaft, between the back of the hollow shaft and what is labeled on the diagram as a beveled pinion. Reassembly without what is left of the spacer reveals a freeplay gap of about 8mm. Would this bronze piece be original or not? Would it be something that someone installed to cover another problem? I really can't see another problem, but I've never been inside of one of these. Just doesn't look right. At 2000 rpms in forward gear, the clutch shaft is running 2000 rms in one direction while the bevel pinion is running 2000 in the other, with only a piece of bronze between them. That explains why the bronze didn't last, but looks like too much of an engineering flaw to be original. BTW, in case someone has a better diagram than me, it appears the original piece should have been 8mm thick with an i.d. of about 30mm and an o.d. of about 60mm.

 

[forterra9641]

Hi i just bought a 6340 1994 model with the same reverser as you have. curious as i am i asked about different things about the tractor. and i got a tip about the reverser. it should never be put in the neutral position because i was told it could wear out something its probably the same as your mysterious ring. also avoid to change direction as tractor is rolling. if kept in reverse position instead of neutral when tractor is idling its a problem free system hope this helps

 

[dyates]

Thanks for the info. I finally got this problem fixed, I think. It wasn't much fun splitting the tractor, but waiting 6 weeks for parts was even less fun. I had to replace a shifting collar, the bronze washer and shim to tolerance; well over 300 bucks for pieces I could hold in the palm of my hand. On the plus side, this tractor was much easier to work on than I had figured. I am now waiting on seals for the front drive axle. Hopefully, I will eventually get past the abuse and stupidity of the previous owner to end up with a good machine. I sure like the way it climbs.....just like a cockroach.

 

[per_ola]

forterra 11441. send ei melding,ser ut til vre fra samme land og ha felles interesse.
agrilinenorge@live.no

 

[forterra9641]

den er grei per olav