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Old 07-26-2016, 01:52 PM
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Kobalt air compressor won't build up pressure

I was away from home and when I returned home I heard compressor running in garage. I thought that it bled down pressure and started running to build it up however when I checked ball valve was shut and there was no air leaks that I could hear.
There was a burning smell and pump was pretty hot itself, oil is full. I took off air cleaner and it looks like/smelt burnt. Compressor itself works but doesn't build up pressure. What could be problem. Don't want to buy entire whole pump if I don't have to, would rather rebuild pump myself if I have to.
Compressor is Kobalt K7060HFV

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Old 07-26-2016, 02:23 PM
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Sounds like a broken reed valve.
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Old 07-26-2016, 03:12 PM
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Pull the line where it goes to the tank , if you get pressure from the compressor , then the check valve is stuck/failed , if no pressure , it's time t dig into the pump ..
dave
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Old 07-27-2016, 04:47 AM
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oil less, right? very simple to rebuild, flap valves and a ring, maybe a couple needle bearings. you'll laugh when you see the ring. check the one way valve going into the tank too but it sounds like the pump is fried.
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Old 07-27-2016, 09:42 AM
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Its oiled unit
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Old 07-27-2016, 09:54 AM
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Yes, assuming the piston(s) are still going up and down, something caught in a simple reed valve and holding it open or they're loose or they're broken off... look for them just below the air cleaner... they flex and let air in, don't let it back out, when working right...

Should turn compressor off when not around it or using it for any length of time...
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Old 07-28-2016, 09:21 AM
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...........or that pressure switch with the shut off lever on the side if anything like my Kobalt 'pressor. If it sticks/fails, it wont shut off
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Old 07-30-2016, 11:24 AM
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So Ive drained compressor and turned it back on and its building up pressure real slow. Reed valves are bad?
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Old 07-30-2016, 01:09 PM
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You have intake valves (to keep air in the compressor) and exhaust valves (to keep air in the tank) just like an engine and both have to be working right...
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Old 07-30-2016, 01:37 PM
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I've taken head cover off and found this
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Old 07-30-2016, 02:20 PM
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Not sure what I'm seeing... is something broken in that 3rd and 4th picture?
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Old 07-30-2016, 02:21 PM
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Quote:
Originally Posted by BuzzLOL View Post
Not sure what I'm seeing... is something broken in that 3rd and 4th picture?
Copper (I think its copper) gasket must've oveheated and blew apart. I wonder if I should apply new gaskets and reassemble it or I need to swap out valve plate?
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Old 07-30-2016, 02:42 PM
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Gaskets and re-torquing the bolts will prolly fix it right up... looks like you were lucky...
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Old 07-30-2016, 02:46 PM
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Just ordered new gaskets, hope it will solve it. Cleaned up tops of pistons as well from carbon.
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Old 08-15-2016, 06:22 AM
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Looks like your flap valves are toasted to me. replace them while its apart.
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