Denny,
When I read your most recent post last Friday, I thought I would see what could be found on line (long story/short I had way too much time on my hands while monitoring the foundation repair crew all day).
Before getting your hopes up too high, lets just say this specific documentation as others have noted is nowhere to be found on the web (rats, darn and such words come to mind).
Even though B500 manuals/parts lists couldn't be found, I did dig for anything related and am going to use a few reply posts to share findings as they may provide some reference or use in your restoration.
One of the first things found was a posting in another forum indicating a relationship between "Barrett", "John Bean" and "FMC" (see attachment). As the original poster indicated there is a close resemblance/manufacturer relationship between these companies, I was also able to find and download user and parts manuals for an "FMC 601" as they could provide some understanding of the "B500" design and operation (see added attachments).
More replies with added finds coming shortly.

(Edited per Jerry find)
Attachments

Last edited by Gdads51; 07/24/2022 4:51 PM.

~ Dan
1951 Chevy 3 window 3100
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