Yep, I would have thought that the long countershaft may have to come right out, on that model.
But there
might be a way to avoid that.
If the crank handle socket/nut is removed from the right hand [from normal operator's position] end of the countershaft, that will allow removal of the shaft bearing housing. Some pics of that end, in an old thread are
HERE.
With that out of the way, there just might be enough clearance between the shaft, and the hole in the sideplate, to slip the belts out through the hole one at a time, once they are off the pulleys.
By the way, with a dual belt drive like this one, ask for a 'matched pair' of belts, when you go in to order them. That is, same brand and preferably same production batch.
Any worthwhile bearing supply place should be able to do this. It's standard practice for industrial drives, to maximise belt life - ensures they are the exact same size, and will stretch at the same rate.
