mahindra 3215hst

Not sure what you mean. Are you saying both rear tires are locked in drive position and have no slip? That means your differential lock is engaged.
 
Start with the foot pedal that engages diff-lock. Then work backwards from there. Common problem to have a linkage issue or a stick stuck in there. At your foot, is the diff lock in the up position?
 
The diff-lock is in the up position and,works freely. Cant see where anything is stuck under the tractor. I tried backing up zigsag and nothing works. I sure appreciate all your advice.
 
There might be more to work with if you passed along some history like when did it last work RIGHT, what (if anything) happened just before this occurred, things like that. What you describe does lead toward a dif lock engaged, but could also be much more serious. Like internal differential problems.
 
I got stuck in the mud, as i recall i believe one tire was spinning but not the other. Was what my wife said, but i was sure both were engaged. Other than that it could have been in two wheel for a while, but not sure
 
Okay, that makes a little bit of sense. Something many people don't understand concerns how a dif lock operates. MOST mechanical dif locks should be engaged only with the tractor stopped. With one tire spinning and one stopped engaging it can cause severe strain on the internal moving parts. Quite often people learn this lesson the hard way. When the spinning parts engage the non spinning parts things can get strained, twisted, bent, broken, ETC and can indeed produce the end result you now have. MAYBE you can pry things apart from the outside and get lucky. Then again it may involve removing the axle housing on the dif lock side to repair the damage.
 
That sounds good. But one question when you say may have to pry things ap[art from the outside. Where do I start?
 
Look at the dif lock pedal and related linkage that goes into the tractor. When you push the pedal down to engage the lock what happens to the part that goes into the housing? Can you see anything moving? I can't tell you exactly what to look for as every tractor make and model is slightly different in that regard and I've never seen your model. Your chances of a quick fix from outside are limited at best, but since I don't know the model I can't say that for certain.
 
I did locate the serial # 321 054 70530. You asked me about the part tjhat ,goes ,into housing, it moves little but seems, to me it does not move enough to disengage. I thinking that I might be able to move with a small pipe wrench??? model #3215
 
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