Compressor Won't Shut Off?

 
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Old 04-08-2012, 12:24 PM   #1
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Compressor Won't Shut Off?


i do not work with this compressor it's just a extra one i use around the garage, but anyways its a kobalt 10 gal 1.5hp older model about 6 years old, it will start up and continue to run into the 130's and never shut's down, it's got a digital set up with a 40/90 and a plus or minus , the prv doesn't blow or anything, im hearing maybe a pressure swith, i don't know , any help would be appreciated or direction
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Old 04-08-2012, 12:27 PM   #2
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Re: Compressor Won't Shut Off?


maybe got air in it

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Old 04-08-2012, 12:37 PM   #3
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Re: Compressor Won't Shut Off?


so does that make it a chinese air balloon?
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Old 04-08-2012, 12:41 PM   #4
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Re: Compressor Won't Shut Off?


I thought the safety blows over 150....
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Old 04-08-2012, 01:08 PM   #5
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Re: Compressor Won't Shut Off?


I set my DeWalt to go up to 130-135 psi???
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Old 04-08-2012, 01:56 PM   #6
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Re: Compressor Won't Shut Off?


I've got one that does the same thing. I'm thinking there's a high pressure shut off switch and I'm thinking it's gone bad. I've never worked on compressors so that's just a guess.

But my new makita compressor just arrived last week so I doubt I'll be fixing this one anytime soon.
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Old 04-08-2012, 02:05 PM   #7
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Re: Compressor Won't Shut Off?


IMO it is probably a leak from the pump to the tank, most likely a fitting gave out, thus preventing it pressure up to trigger the pressure shutoff. I have had this happen to two so far. I am sure they could have been fixed but I didn't like them to begin with.

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Old 04-08-2012, 02:08 PM   #8
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Re: Compressor Won't Shut Off?


sounds to me like a leak in the feed line from pump to tank. If there is a small pin hole in it then the pump will not know when to shut off. I had something similar and didnt catch it in time blew the pump.
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Old 04-08-2012, 03:18 PM   #9
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Re: Compressor Won't Shut Off?


Since it's building pressure over the specified cutoff, I'm putting my money on pressure switch.
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Old 04-08-2012, 05:19 PM   #10
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Re: Compressor Won't Shut Off?


oh i agree it could be that too, mine did the same thing and it was the feed line. But on electric compressor i would think you are closer to the prize.
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Old 04-08-2012, 05:27 PM   #11
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Re: Compressor Won't Shut Off?


One of two things. The high pressure cut off switch is no longer functioning or the rings are worn enough that they can't reach the pressure the switch needs to shut it down.
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Old 04-08-2012, 07:04 PM   #12
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Re: Compressor Won't Shut Off?


What pressure is is supposed to reach? Is it 125, 135, 150 psi etc etc? Like said above if the compress is running above the specified max psi your pressure switch has pooped out on you. Simple fix, I just got inside from replacing one of mine. YOU MAY NOT need to replace it. Most are adjustable, if you take the cover off the pressure switch there are normally instructions on the back of the cover on what to adjust. Its REALLY simple.

This is the one I just placed on mine.
http://www.ebay.com/itm/AIR-COMPRESS...ht_1145wt_1396

I have it adjusted for 105psi on and 145 psi off.

Most 125 max psi compressors have a the safety blow off at 135-140 psi. 135 psi compressors use 150 blow off and 150 psi compressors use 175 psi blow offs. Check your tank specs to see how high of MAX psi it is rated for . My 60 gallon is rated for 200 psi....I have a motor and compressor head off a 125 psi unit that is able to get up to 155 psi no problem. That extra PSI is great for working on cars when you need to give your impact gun that little extra boost of power.

However, if you compressor is supposed to get to a pressure higher then 130 yet won't build pressure over 130, you then have either a leak, worn piston rings (or piston if oil-less), or you may be getting a bad seal at the reed valves....it COULD also be a clogged air filter.

Last edited by TBFGhost; 04-08-2012 at 07:08 PM.
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Old 04-08-2012, 07:11 PM   #13
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Re: Compressor Won't Shut Off?


http://www.generalairproducts.com/do...ent-042705.pdf

That goes over a few types. The most common is the 2nd down.
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Old 05-01-2012, 05:58 PM   #14
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Re: Compressor Won't Shut Off?


I got one used that was never drained. high pressure line was clogged and head pressure valve was defective.

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