by Tom
(New Hampshire)
I recently moved and relocated the compressor. Upon restart , after replacing 2 quarts of correct oil, it ran for about 40 seconds before shutting off. I found the low oil switch had tripped. press reset and goes for 3-4 seconds then shuts off.
Does the low oil unit have anything that could be clogged or air bound? Did laying it down to move effect anything? ( I drained the oil before I laid it down )
Any help would be appreciated. Tom
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Low oil switch keeps tripping
Presuming you actually have the correct oil and level of oil, does it run longer after it sits awhile?
I’d guess after a while, it will get whatever it’s looking for, and stop tripping.
Meanwhile, and again if you’re certain the oil level is correct, bypass the oil switch until starts working and un-bypass or replace it if you decide it’s broken (possibly in transit, maybe just died.)
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Reply for Doug
Yes 2 quarts per the specs. It also shows halfway on the site glass.
yes it does run longer if you wait a while.
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Low oil switch
Well, I’m standing by my original idea of bypassing it.
It’s what others have done, and as long as it doesn’t run for extended periods unattended, it’ll be OK as long as you keep the oil up.
I don’t really understand how it works, and worse, there are old and new versions of it – and they are expensive at 160 to over 200 bucks.
Let us know if it starts working after a time, or you just give up on it, or you find out anything more about it.
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Champ low oil switch
Well, if you take the air line off the back of the switch and spin the cap off, there is an aluminum plunger with two o rings on it.
You need to ether replace the o rings or the completed assembly.
I had one but just used it on a job and am looking for a new one, that’s how I ended up here but anyway that is the fix.
I would urge you not to bypass the low oil switch.
Based on the symptom in the original post, this isn’t an issue with the o-rings. (Air leaking out of the little bleed hole on top of the housing would be a symptom that o-rings could fix). I’ve attached a picture of the schematics for this sensor/switch. If the symptom is that it switches off after a few seconds of running, then the problem is that the rod on the float (#2 in the diagram) is not stopping the piston (#10) from pushing on the electrical switch (#16) when head pressure builds up. There could be a number of reasons for… Read more »