4500 4wd disengaging

[99k1500]

Here I am again asking questions about a tractor that is not mine. My step-father has a 4500 that the 4wd lever has been broken for several years. His fix was to manually put it in 4wd and leave it.
the engagement lever is sheered off clean with the case, leaving nothing to stick out to engage or disengage 4wd.

Now after several years it won't stay in 4wd. I have welded a small not on the sheered off shaft allowing me to engage and disengage the mechanism, but I suspect that there is play in the shaft that has allowed the splines to strip and therefore not engage 4wd.

Does this theory make sense? Is the shafte "easily" removable? how about the front spine coupler?
It appears as if the Shaft is about $300 and the spline is only $55 . AM125143 and M132456

I don't have the tractor in my possession. I am trying to research as much as I can before I go to work on it.

It appears as the philosophy is the when you engage 4wd that the entire shaft is pushed forward into the front housing... The best I can tell is there is a spring that pushes the shaft back when the lever is disengaged. there seems to be a fair amount of play in the shaft as you can slide it forward and back by hand - about 1/2"

advice / thoughts about this tractor or a similar tractor are appreciated.

 

[beenthere]

99
Not sure the attached pic from the serv tech manual includes all that you ask about. If it helps, fine. You may have that part figured out already.

 

[99k1500]

99
Not sure the attached pic from the serv tech manual includes all that you ask about. If it helps, fine. You may have that part figured out already.

Beenthere,

That certainly helps, if nothing else being able to describe the problem.
Part 21 the shift, shaft has sheered off even with the case. Ideally I wold be able to replace that.

With "18" being a retainer it would lead you to believe that you could simply drive that shaft out whith a replacement, but I am sure there is more to that part than a bar that simply goes through the case. As you twist part 21 it is supposed to engage the front drive shaft.

It seems as if I am only getting a partial engagement. But with 21 sheered off flush with the case it is a little difficult to twist!

I guess I am trying to figure out if the engagement happens with at the front of the tractor, or inside the rear housing probably at the shift collar and the rear shaft "6" and "7" in your diagram.

Sure appears as if a fix involves splitting the tractor.

 

[waycoolmarine]

its not that big of a deal to split the tractor , make shure you take the loader off , makes it a lot easier . but i have done a couple of these and turns out part # 11 and 12 are bad the block #12 wears and will not push part #6 far enough to engage the 4x4 driving in 4x4 on payment can cause some very expensive front axle damage

 

[beenthere]

[

With "18" being a retainer it would lead you to believe that you could simply drive that shaft out whith a replacement, but I am sure there is more to that part than a bar that simply goes through the case. As you twist part 21 it is supposed to engage the front drive shaft.

The spring pin "11" appears to be the key part that holds the shaft "21" from being removed (driven). If that spring pin can be accessed from above (and removed), then splitting may be avoided. But admit no experience doing this.

 

[99k1500]

its not that big of a deal to split the tractor , make shure you take the loader off , makes it a lot easier . but i have done a couple of these and turns out part # 11 and 12 are bad the block #12 wears and will not push part #6 far enough to engage the 4x4 driving in 4x4 on payment can cause some very expensive front axle damage

Thanks for that information, I believe that is what I am facing... The tractor never hits the road, mostly dirt work and light mowing / clearing. As I am sure you are aware, a tractor of this size is almost worthless without 4wd.
What you are describing after looking at the technical drawing is exactly what is being experienced.... I may just have to bite the bullet and split the tractor.

 

[99k1500]

Without the tractor here.
Without the handle and mechanism that actually engages the 4wd - it is long gone
Can anyone indicate which direction the rod "part 21" rotates when looking at it from the "left hand" side - exactly the orientation as the diagram.
A Clockwise or Counter Clockwise indication would help tremendously.

for me the rod has been sheered off flush with the case - I have ground it clean and tried to tack weld a small nut, to allow me to turn it. Obviously I can't dump to much heat into this as it would ruin the seal.

 

[Zebrafive]

Without the tractor here.
Without the handle and mechanism that actually engages the 4wd - it is long gone
Can anyone indicate which direction the rod "part 21" rotates when looking at it from the "left hand" side - exactly the orientation as the diagram.
A Clockwise or Counter Clockwise indication would help tremendously.

for me the rod has been sheered off flush with the case - I have ground it clean and tried to tack weld a small nut, to allow me to turn it. Obviously I can't dump to much heat into this as it would ruin the seal.

Can you tell if shaft 21 is forward or back from the spot on the operator station for engaging 4wd? Parts shows a crank that connects to the shaft 21. The rod with the tee handle connects to the crank arm. You pull UP to engage 4wd.

 

[99k1500]

That is my problem... Everything in that diagram is gone!
In my mind - Imagining those parts... lifting on the lever (that is gone) would probably rotate part 5 ( that is gone) counter clockwise.

It is not like I can't go over and try both positions...But I am thinking the shoe is warn out from years of constant use in 4wd mode.

 

[waycoolmarine]

not to sound like a jerk ! but why not fix it right ? its not that hard to split the tractor. just replace the shaft and what ever is broke / worn and buy the missing parts that tractor is still worth money ! you will need 2 floor jacks and your 1st time maybe 4-5 hours to get it apart order parts and 2-3 hours to put back together the 1st time i split one the hardest part is just the fear of doing it