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Compressor crankcase oils have a few determining factors, speed, capacity, splash lube or pressure lube, oil temp cooler controlled and material makeup. After many years I have seen severe varnishing with Royal, Chemlube and Shell, the least amount of failure and varnishing have been Mobil R...

Airgunfan, your relay is wired to 7 & 8 , his would need to be A & B per the config,

Ok, this what we call a hot relay, its not the best way because it will fail with the compressor energized and will blow the disc...it needs to energize or change state to shut the motor off 'circuit closed when preset pressure is reached' that will change the state of the relay your relay...

I need to see the relay config, it may be printed on the side or manufac# and model # Did you get a press switch ?

The relay in your pic is different than the one in the previous post.. I cant see the relay config. however we can try this: o is a terminal, --------- wire + o--------o [press switch terminals] o---------o [coil A1] 120V - o-----------------------------------------------------o...

If the bushing fits tight enough it will keep oil out, causing failure fast, I see a groove the bushing bore in the rod but no way to get the oil in the journal to bushing space, I may have to buy one of these units to tear it apart...Self lubricating bearing would need an ultra polished crank...

Post a picture of the control panel with the door open, typically the pressure switch will have normally closed contacts which open on rising pressure, thus interrupting the power to the contactor coil. Sometimes a relay is used because the pressure switch contacts can't handle the current...

With 30+ years in the compressor industry, 55C [131 F] isn't out of the norm for that kind of pressure, we see 200-300F discharge temps on recip types like you see in the local tire shops, screw types run at 200+F , oil free screws run up to 450F, these are all at 125-175 psi. 5000 psi 100hp...