Thanks Randy. I'll look into the G57 or G55 pumps as a replacement. This wash was built in 1993 and belonged to my father, it's been shut down for 5 years and I'm just trying to get it up and running.
I had the same issue. My wash was running 3 5100s for low-pressure chemicals, I'm switching them over to G55/57 as they fail. The diaphragm is probably busted or cracked on your chemical side. I have a parts unit lying around if you want it, I can ship it to you. Also, the small o-rings on the shuttle are bad to break/deteriorate. If you get a standard Viton o-ring kit from a part store it's the -2 or smallest ring in the kit.Thanks Randy. I'll look into the G57 or G55 pumps as a replacement. This wash was built in 1993 and belonged to my father, it's been shut down for 5 years and I'm just trying to get it up and running.
There are three kits for those to fully rebuild it. The Viton diaphragm kit and the shuttle valve kit are almost $80. FWIW I just replace them, and I recommend tightening the screws before installing.I found a 57 in the “parts graveyard” up in the loft and it looks good but there are a couple crusty o rings in it. I’m going to order a repair kit and rebuild that for a spare.