Have a site with 340 cat pumps direct drive. These are older pumps, they have been well maintained. I replaced hi pressure seals pistons lo pressure seals and also installed nw seats that seem to get pounded from leaking. My question is I still have lo pressure 900psi at the gauge. Nothing is different in plumbing no changes. Also replaced hi lo pressure valves with same. Adjusting them makes no difference, you can go down in pressure but not up?? Where did I go wrong here?? I had rebuilt them a few years ago and they worked perfect, now I dont know??? Any ideas?
Cat 340 Low Pressure
- Thread starter wolfe
- Start date
car washing systems inc
Member
Sounds like the press regulator could be bad, mabey a seal in backwards
MEP001
Well-known member
You could have a bad regulator, a worn tip, a defective check valve in the system... there's a long list, and these questions are very hard to answer when you don't know what to look for. I think I'm going to start recommending people to pay a car wash technician to teach them the basics of pump repair and diagnosing. It's not that I don't want to help, but it's getting old answering the same questions over and over. There are also many, many posts on the same subject which by now together should cover every possible problem.
I.B. Washincars
Car Washer Emeritus
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I think something that would be very handy to have on this forum would be pics of a washed out head. It looks like many people don't know what to look for and just plain don't understand that it is something that you can see and feel not some mysterious thing. If someone had a washed out head, preferably fairly bad, that someone could take pics of, we could have Bill make a page for them. This would probably save many some time and keep from throwing away the price of a seal kit when rebuilding a junk head.
I would like to see a photo of a washed out head.
