New Holland Haybine Gearbox and Belt Replacement

Hey guys,
I posted a couple days ago with some questions about the gearbox of a 479 Haybine as we had quite a bit of slop in the shaft at the end of the
PTO drive...so in taking that apart the question became how to remove the bearing races and spacer and, as stated on here, in order to remove
that part of the drive, the gear on the other shaft would have to be removed as well.
In looking, we determined the best way to approach this was the remove the retainer ring on the shaft, remove the four bolts holding the
gearbox on and slide the gearbox off the shaft and disassemble from there.
So far, very successful. Decided since we were going that far, we would replace the bearings on both shafts in the gearbox and also do the belt
that drives the cutter bar as it is cracked and worn - original from new in the mid-70's.

So here are my two questions:

1. Could someone describe the process for belt replacement - any tips/tricks. It looks like we can feed it into the hole for the gearbox to
squeeze it around the upper pulley, but it looks like the lower drive will be a little more difficult...

2. Anything else we should. Consider replacing while we are at it. Chains on the sprockets seem to all be relatively tight. Though it is an old
machine, it is pretty well kept - been here since new, mows 65 acres a year, generally stored inside, always greased and maintained.

Thanks in advance

There are three bolts on the bottom of the wobbler. Take those out and also the bolt on the sickle bar. From there you should be able to fish the belt out and a new one in. There is a bearing above those three bolts I would check out and replace if suspect. As long as I was at it I would replace both chains and check the condition of the two idler sprockets on the chain tensioner. It might not be a bad idea to go through the entire wobbler while you're working on it. It can get very pricy if a bearing goes out and wrecks something compared to just buying bearings.

How much further of a project are the chains...ours appear good...but, while at it...might as well set myself up for another few decades.

Thanks for the tip on the wobbler bearing

Did you take them off to pull the gearbox? They aren't hard, fishing the longer one through the tensioner is the hardest part. The ten foot roll will cover both chains.