Starting at the back of that shaft, I believe it has a flange that the rear bearing rests against, then you have the bearing and the gears and spacers stacked along the shaft until you get to the front bearing. Then the alignment joint goes on the outside with a capscrew into the end of the shaft. Make sure that capscrew is in place and tight.
If that is all OK, the outer race of the front bearing inserts into the housing from the front with a 2 piece retainer clamped onto both sides of the bearing. I don't see a way that assembly could be loose and allow the shaft to move back (probably forward though).
The only ways I see (other than the above mentioned capscrew) for the shaft to move back is if the front bearing itself has failed and is allowing the shaft to move or the shaft itself has some major failure.
It looks like the rear bearing supports the shaft but does none of the fore/aft positioning. Unless the shaft itself broke, it looks like your problem has to be at the front, all accessable at the input joint. Adding spacers would push the gears and rear bearing farther back.
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