1855 trans. input shaft hydral shift output shaft

jasinpa

Member
both output of hydraul shift and input shaft of trans. have the splines worn hard , coupler sprockets slop back n forth , does anyone have a fix for this or know where to get these shafts new , how hard is it going to be to replace them , also any recommendation on where to get the new chain and sprockets for coupling them shafts , some say after markets dont hold up to get them from agco , engine is out for overhaul and will be turned up a bit , dont want things flying apart once it is back to work in spring , it does get used for heavy tillage with dual wheels , this one works hard for a living and has treated me very well , .......more then i can say for my 4430 deere with its million dollar jerk-o-matic trans, but thats another story
 
AGCO still sells both shafts new, I believe. There's not much you can do with the output shaft from the o/u except replace it. Some guys use a longer sprocket on the transmission input, but given what you're doing now and what you expect from the tractor - I'd replace it. Go with the AGCO chain and sprockets.
 
thanks for the info , ill have to see how bad agco will dig into my wallet , hate that thought , not afraid of getting in trans. but the thought of working on that hydraul unit myself scares me a bit , i assume it has to come clean apart to replace that shaft
 
Jerk-o-matic you say! LOL Here I was calling it the Generation 2 Ford power shift, since Ford had it first and it was engineered by the same guy!
 
   Look at the splines on the trans. input shaft.   It will have enough unused splines as the length of the sprocket.   I have taken a new sprocket and machined it down to the part with the splines and wire welded it to the original, now you have new splines in the hub and unused splines on the input.   You are transmitting power in the form of speed with low torque (twisting) force, so you don't hae a lot of force against the weld.

   The sprocket on the output shaft of the O/U is held firmly on the shaft with the nut at the back.   There should not have been any movement to wear the splines.   Should the sprocket be worn where the chain has been, you should be able to unstake the nut and slide the old sprocket off and reassemble.   Have done several and no problem.
 
If you can do one, you can do the other. Make sure the splines are actually worn on the output shaft before tearing it down. As someone else mentioned, that shaft doesn't wear there unless the nut holding the sprocket on is loose. But the thing is, once you have the o/u opened up, you will likely see other things that need to be fixed. You'll probably want to 1) apply the rebuild kit - o-rings, snap-rings, and seals, 2) replace the sprag clutch that is used for under drive, and 3) replace over and direct clutch plates. Also, after reassembly, you can test that it works before reinstalling it in the tractor. Obviously, a repair manual will be needed for both. And neither shaft will be "cheap", but it is very likely you will not have to change them again.
 
im only shooting for the power of a 1955 when i say turn it up , which shouldnt be a problem being the same engine , the only reason for the overhaul is because at one time, befor i owned tractor, someone put none turbo liners in 3 cyls. causing head gasket to blow out , by doing so it beat on the block causing it to need a counter bore repair sleeve , but befor that i could pull a 20 foot disk in plowed ground with it ,yes it worked but i dont beat it to death either
 
(quoted from post at 21:23:34 02/20/15) thanks for the info , ill have to see how bad agco will dig into my wallet , hate that thought , not afraid of getting in trans. but the thought of working on that hydraul unit myself scares me a bit , i assume it has to come clean apart to replace that shaft
t ain't as scary as you think. I have one apart right now. [b:9fb5a65125]That shaft can be had from the rear of the tranny[/b:9fb5a65125] but it would be foolish not to inspect the whole tranny while you have it out

Parts are expensive, just a seal and o ring and snapring(that one does not need) runs $340, clutch plates are +/- $34 a piece( there are 10-11 of them in there) The two coupling gears and chain run $275
i'm sinking around a grand in it and that does not include shafts or bearings.The only other things that need replacing in mine is a brass spacer $110(it may come with the seal kit) and direct clutch end plate $210( it just about popped past the snap ring)(All prices from Agco and in canadian dollars)
If the sprag clutch looks good and the shaft has no wear i would plunk it right back in if i was you.
( in your case the worn splined O/U out put shaft has the sprag clutch riding on it,..that shaft will be a pretty dollar i bet)
Thank God mine is still good.

on edit,.when i was cleaning some parts tonight i saw i made a mistake identifying the location of the O/U output shaft.
The tranny has to come all apart in order for that shaft to come out.
 
The 1955 engine uses different pistons with a stronger ring set up. I don't know exactly what the horsepower limits are for the 1855 pistons are, but it would be less than the 1955 piston/ring setup. I'd talk with someone who really knows before I got too far along on upping the power of that 1855.
 

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