Hi CJ and all,
I'm sure that harsh impact would've been a major consideration and as you suggest no serviceable lubrication like the cutter reel bearings had access to.
It's just the very odd size of the outer race that's very frustrating when everything else is rather standard. The other thing I find rather strange and that is that the manufacture to order bearings that are now made available are exact replicas even down to the two different shields on each side. One would think that neoprene shields would be far superior than metal shields as far as entry of dust and foreign matter is concerned.
I'm going to take an original down to SKF and see what they can come up with as they are manufacturers and retailers, but one things for sure, with that odd sized outer race it's never going to be cheap.
I note that we still have OEM Scott Bonnar bearings here in our online store for $36.00 each, but then add $10 postage and that's $46 for just one bearing is a tad rich, mind you that's still slightly cheaper than any of the two eBay sellers are.
I'm interested to see what outcome CP comes up with.
Cheers,
BB.