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Also, be sure the head is not cracked. (Mine did.) It sounds like it could be a bad valve, but isn't. Filter Techs had the head for my K14. Not sure whether the Utilus uses a different head or whether they are prone to crack.
I was able to replace the 1st stage valves and it still leaks out the inlet filter after shutdown, not quite as fast as it did before but I am back to square one. It still fills tanks ok and the 1st and 3rd stage head temps fluctuate between 180 to 190 degress F but the 2nd stage is up around 200 degress F.
What dealer did you get your 7780 through?
I was able to get the valve from jordair in Vancouver, Canada. They told me it was ordered from Germany and it took several weeks to come in. The second stage on my two compressors (U-1 and K13) is always the hottest and I think its inherent to the design being cast iron cylinders and small head. If you look at the newer versions they have increased the head size and cooling fins on the second stages. I have been debating machining some aluminum heat sinks for the heads to help.
Well, I finally found and replaced the 7780 discharge valve for the 3rd stage valve. It was hard and expensive little buggar that I hoped to solve my problem. And with that, my frustration, it still didn't solve the problem with all the pressure leaking out back through the 1st stage inlet filter.
I am at a loss here fellas, I replaced all the intake and discharge valves for the 1st and 3rd stages. The only one left is the 2nd stage and I hate throwing money at something in hoping to fix the problem. Any suggestions from anyone would be greatly appreciated. Too bad Bauer doesn't make a troubleshooting manual or something to diagnose difficulties.