It was pressure tested to 300psi when it was new, it has no damage that I can see and Im only going to run it at 125psi.My plan is to get it running and put it in service in my shop.
Im tired of waiting for my little 2hp compressor to catch up. Novaderrik offered the suggestion of disassembling it and unloading in pieces. My engine hoist wasnt tall enough to lift it down, so thats what I did. The pump has a 5hp rating and since it only turns 400-900 rpms I wanted a 1725 motor to keep the drive pulley a reasonable size. Brand new, made in the USA, and shipped to the door it was less expensive than the Chinese motors that Northern and HF carry. Ill loose a few CFM, but since Im dropping the air pressure from 175 to 125, I should get at least some if, not most, of it back. Since the original motor must have been slotted and the new one wasnt, I had to cut slots in the 14 mounting plate for belt adjustment. Quincy 325 Air Compressor Driver Stethoscope TracedA trusty screwdriver stethoscope traced the noise to the check valve at the tank inlet. The pump is building 10psi of oil pressure and the crankcase is as quiet as a tomb. No rattles, no knocks, just a little clicking from the valves in the head. Or by turning the valve on the back of the pump it will run using the unloaders at the top of the head. The pump runs continuous and the unloaders will make air or dump, depending on the pressure. The rubber parts in it were just as bad off as the diaphragm. The good news is, that part is available, the bad news, its stupid expensive. It might be getting re-plumbed to just pressure control. It comes with all the gaskets, diaphragms and springs in the head. It should be in this week and Ill be pulling all the valves, cleaning everything and putting it back together. The unloaders have to work so they will dump head pressure at shut down. The only thing I will probably do is add a reel hose to the outside so I can air tires without opening the door. Their prices were better than anyone else including Quincy and Ebay. I did find a guy on YouTube that has some pretty good videos for the Quincy owners. Id probably trust an old tank as much as I would a new one though.
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