I looked at the pictures in detail. It's amazing how little changes on NH bailers. Even my ancient Hayliner 66 has the same gearbox and flywheel as my 575
NH fades to a nice brown patina.....:laughing:
I'd lift the knotter shroud, release the knotters, swing them up and see how sloppy the wiper arms are, the condition of the twine knives and the billhooks.
There is an absence of grease around the knotters. That worries me.
There is crud in the bale case but the knotters are clean. That makes no sense unless they were pressure washed and without an immediate re-grease (and again, no visible grease), a big no-no on a machine that's sitting.
Run the plunger out (rotate the flywheel by hand) to the farthest point (with the connecting rod pivot against the front sheet metal) and reach in and grab the backend of the plunger (you can get a hold of it with the cross shaft that the connecting rod is attached to) and move it up and down and back and forth. It it has a lot of movement, especially up and down offer him/her less. it's adjustable but a PITA and is indicative of a heavy use machine. while in there, check the connecting rod at tke crank end to see if there is excessive play. Some grease, some are sealed bearings.
Run the plunger back in and check the knives. Are they knicked or split. If so, they are replaceable agiain but a PITA. offer less.
Finally, check the drive chains. Are they out of adjustment on the take up idlers? Are they dry and/or rusty? If so, offer less. Replaceable but again, a PITA.
Finally, check the over running clutch on the front of the flywheel and make sure the pawls ratchet correctly. It's important that the over running clutch ratchets properly and make sure there is some lining left on the clutch discs.
Finally, the release arm is in the tripped position so you can cycle the unit by hand to make sure it's in time, the needles are in correct time and the needle latch operates properly...(that's the crank and wire rope on the left side, below the counter).
They don't have to be pretty to run well but they do need grease and I don't see any.