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Then you stopped the machine quick and will have an easier time of it. It took "the spirit that beat the japanese" to get mine on over the sprocket teeth without breaking the track. The front "sprocket" is called the idler. (the little woman called it the "big wheel") Since the adjuster is bad--To get that track back on then, I would try unbolting the adjuster from the idler flange (count and save the shims) then push it rear ward until the track can be pushed back over the idler flanges. Overhaul or replace the adjuster while you have it off. An After market replacement adjuster maybe cheaper than paying deere or a shop to overhaul it, especially if the piston is bad. You may have to push the idler forward first to get the adjuster out of the coil spring collar, then push it backward until you have enough clearance to push the track on. There should also be a cover over the spring held on the track carrier with 4 bolts. Once its off, you will see how the adjuster fits into the spring collar. If its been in there a while it maybe rusted tight and jammed with dirt. Some prying maybe needed. Then push the idler forward again once the adjuster is out and the track has been moved back in place. You haven't mentioned under carriage wear or chain wear--you should check the flanges on the idler for wear too while your at it as well as the wear strips it rides on. A worn idler, chain, rollers, pins, and leaky adjuster are all things that can combine to throw a track. A track that is out of alignment can wear the edges of your sprocket and idler flanges. Track alignment is something i don't see discussed in this forum, but chain and sprocket wear is a popular topic. PS, there is no removable link. Just the master pin is removable should you find you need to break the track to get it back on the idler. You will need to remove a track shoe or two at the master pin for working room. There should be shims riding in the link ends on the master pin--be sure not to lose them and note if they are both the same size(s). The other pins, bushings and links have to be removed with track press equipment. Their not serviceable in the field.
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