Devil Bliss IRL5020 compressor shuts itself off before building pressure

by Tom Bainbridge
(Durham, NC)

The compressor runs briefly and then shuts itself off. I removed the cover on the starter switch. At any time when the compressor is not running I can press down on the starter mechanism and it will run. As soon as I release the pressure it stops.


There is no air pressure reading on the pressure gauges and no air coming through the hose. Has worked fine for a year.

When it shuts itself off, the starter switch seems disconnected (gets loose and floppy.)

Don't have any idea where to go next.

Oil level is fine. No apparent overheating.

I just drained the tank for the first time (after this happened). Honestly, didn't know I was supposed to. Got out maybe a cup of rusty looking water. Had to replace the drain cock (original had a stripped butterfly). When I removed the old drain there was no apparent pressure in the system (nothing at the end of the hose). But when I backed out the drain popped out pretty good. So there was something in the tank (gauges showed nothing at the time).

It's a Devil Bliss IRL5020. 5 HP. Supposed to be a good unit. This 'brand' is apparently discontinued but still being made under another name.

Thanks

Tom

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Bill says...

Tom, being that it's a 5 HP air compressor, I guess it's being powered by a 220 AC circuit?

So, since we all know that 110 VAC can sometimes kill you, 220 VAC will for sure if you ground it through yourself.

I's saying this because what I would do with your air compressor problem is bypass the pressure switch to see if the compressor would run up to normal cut out pressure with the switch out of the circuit.

If it works (and remembering that it will not shut off automatically at high pressure cut out if your take the switch out of the circuit) then I would replace the switch.

Or, just replace the switch anyway, as I surmise that this is the problem with the operation of your air compressor.

Did it work? Maybe post a comment to let us know?

Cheers,

Bill



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3.5 horse Devillebis air compressor wont build pressure over 20 PSI

by Brandon McElroy
(Nashville TN)

I have a 3.5 horse Devillebis air compressor.

I recently put a new cylinder, piston/rod assembly, and head gasket on it due to a cracked cylinder.

It was running great for a while, approximately 80 hours or so of run time.

Then yesterday it quit building pressure at about 20 PSI. I checked for leaks and found none.

I tore the compressor apart and the piston and cylinder look fine,

I checked the flapper valves and they are functioning( I can blow through the intake port in the head, but when I suck through the port the valves suck closed allowing no air to pass) I put the compressor back together and screwed my compression gauge( Tool for measuring cylinder pressure in automotive engines) into the exhaust port on the head and builds up very quickly to about 30 PSI. It might be a slight inaccuracy between the gauges, but I believe that narrows the problem down to the compressor assembly. If the piston has a good seal to the cylinder, and the flapper valves are working, and the head gasket is new, what else could it be? I'm about at my witts end with this thing. Any help/suggestions would be greatly appreciated. thanks.

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Bill says...

Brandon, you sure sound like a capable fix-it-up person, so, I am going to assume that you reassembled the compressor pump correctly.

Based on that assumption, and again assuming that the motor is fine, that the power supply is fine, that the check valve going into the tank is clean and working, then I think you have a pressure related failure of an internal gasket, or one of the valves.

Your creative checking of the intake valve... "I can blow through the intake port in the head, but when I suck through the port the valves suck closed allowing no air to pass" is excellent, and that suggests that the intake valve is fine. What about the pressure side?

My thoughts, sir.

Cheers,

Bill

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devilbiss pro 4000

by Jim
(ny)

I have a devilbiss pro 4000 Im not sure if there's a problem but want to check it out. I purchased it use and now that I hooked it up it fills and works fine .

What my concern is that when operating to fill tank the front of the head blows out air like a relief when it finishes filling tank it stops .

I'm wondering if this is suppose to work this way or do I have a blown head gasket.Whats your thoughts.
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It may or not be alright Jim. When you say "front of the head blows out air like a relief", where is the air coming from, please?

If you want to add info, do it as a comment here.

Cheers,

Bill

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devilbiss air compressor starts then kicks off

I have adevilbiss air compressor and i just replaced the piston and it begins to start nthen kicks off. do u need to lubricate the piston

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Bill says...

No idea. From the post you sent in, I don't know what model of Devilbiss air compressor you have, nor do I know even if the model you have is oil lubed or lube free.

Assuming that the re & re was done correctly, dump all the air from the tank, check your power supply to make sure it's clean, and then check the power from the pressure switch to the motor after the compressor kicks off. Is there power still flowing to the motor, or has the pressure switch shut off the flow of power to the motor when the compressor shuts down?

Cheers,

Bill



If the pressure

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