Cerveza,
I'm familiar with the Barton UA-50 pumps. The "50" means it's a 500-gallon-per-minute pump, while the "UA" means it's a front-mount, with a pump water jacket that circulates warm coolant around the pump to keep it from freezing in the winter.
I have a Barton Manual as a .PDF I can e-mail you. Send me a PM with your e-mail address, and I'll forward the manual to you. I think you can click on my member name in this post, and it will offer you the chance to write a Personal Message.
I'm a big fan of the Barton pumps. Fascinating to see one mounted on a "foreign" truck. Very good looking!
-Michael
