OT ac rotobaler?

what are the size of those bales and weight? it would be grassy hay

I believe the book says 60-70 lbs.
There is an adjustment for bale size which will affect the weight.
I have a rotobaler. Now if I just knew how to run it!
I have made 3-4 bales with it, now I need to work on the wrap mechanism.
What do you know about the wrap mechanism?

What arm not dropping down?

No...the arm drops down to near the middle of the bale.
Seems like a long time before it starts to move back and forth.

You need a new spring kit.

Bale range can go mostly from 35lbs to 100lbs depending on the hay,how large you set the bale and how tight you set the brake for density.ALWAYS make sure the brake is not stuck before
baling as a stuck brake will tear up the baler.Just tap the side of the brake to make sure its loose.

So the twine catches into the belts and puts many wraps on one end before the arm starts moving?

Oil up everything under the hood. Don't spare it.

There should be a feeder override lever under the top with a rope hooked to it. My dad would pull on the rope if the twine didn't catch, it would move some more hay into the belts and pull the twine in with it. The twine arm does have a dwell to it after it drops, so don't get in a hurry. Also, if the baler was going to sit awhile he would unhook the heavy springs in the back so there was no tension on them. He used a Crescent wrench, hooked the spring with the hole in the handle to release them. Roto balers take a little getting used to...common sense and practice will make a good bale.

Some people hated handling the small round bales from the Roto Baler , but having grown up with them, I never found them to be any real trouble. Just different. And sometimes different in a good way. If you baled a field of hay one day with a square baler, you needed to get those bales undercover before dark, cause it might rain. Small round bales, not so much pressure. If the weather went bad over night, no big deal, round bales shed water, not sponge it up like squares. Just haul them in after they dry, still as good as ever.

The right hay hooks make handling those bales a lot easier.Yanmar is selling a baler that bales a small bale like the old AC balers.

It's been a long time since I baled hay with a Roto Baler, pulled it with a WD Allis.
We would bale 1st cutting into squares to put in the barn, 2nd cutting we made small rounds, dad made them tight, I'm thinking 16-18" dia but not sure, as I said it's been a while, mid 60's, bales weighted around 100+ lbs, took 2 of us young boys with hay hooks to lift them onto a wagon.
We would leave those rolls laying in fields that we pastured, haul in from others, later when grass was tall enough for another cutting we'd turn the cows in and let them eat the grass, those small rolls where to tight for them to eat so they left them alone.
When it came time to feed hay I'd go out in the field with an axe and chop open a number of bales for the cows, did that each day until all of the bales where eaten up then move the cows to the next field.
When all of those small rolls were feed we'd start feeding squares out of the barn.

Because the bales where small and cows could only eat what was chopped up them cleaned them up pretty good, no piles of waist like with todays larger rolls.

Those old balers can be very dangerous, don't mess around with one while it's running, on a big farm no far from me one worker lost both arms and another was killed by Roto balers. Anytime you get off the tractor to mess with the baler make sure to shut the pto off, if I ever had to leave it running to look for a problem I'd never get within arms reach of the baler, then I'd turn it off before messing with it.

If dad ever saw me close to that baler while it was running I'd get a razor strap reminder not to do it again. Knowing how I'd be reminded helped with my memory, rarely did I need more than a verbal warning.

Where would one find a spring kit??

There is a guy on the AC site that sells them.