compressor problems

[eil]

Can you post a pic of the compressor

 

[rtbcomp]

the valve thats leaking dont look much like that. both of mine cannot be stripped, im sure its got dirt in there as it held preasure last week

It's not meant to, that's the non return valve (NRV) on the tank to show you where the unload pipe from the relief valve connects to.

Try running the compressor up to pressure and switch off at the mains (not the red switch on the black box) before the pressure switch operates. If you don't get any air escaping the relief valve in the pressure switch is ok.

IMPORTANT If you do this, turn the knob on the pressure switch to "OFF" before switching the mains back on, otherwise you may damage the motor. If you get a continuous hiss instead of a short burst it's the non-return valve on the tank.

If you can't clean the NRV then fit a new one.

 

[pondy]

cheers will let you know how i get on, will post pics in a few days when i get the time
sam

 

[pondy]

any one know were i can get this nrv, also need a 5kg reel on mig gas wire and some 1mm tips

 

[eil]

If we cant see the type you've got and its different from the one RTB posted, then were a bit limited in where to suggest you go looking for one.

 

[pondy]

i finally took compressor apart again, the non return valve on the bottom of the control unit had a chunk of black carbon holding it open,as did the valve between the pump and tank, would be better to have these with a filter before them, have pics
will upload later
sam

 

[rtbcomp]

This is fun!

This is a symptom of worn piston rings, prolonged use and/or running too hot for longer than the recommended duty cycle.

I'd give them a good clean and carry on. Make sure you have enough oil of the correct grade in the pump.

 

[pondy]

here are the pics as promised, the long brass one is the one which has been playing up most, the oil is going to get past the rings weather they are worn or not, im not bothers aslong as its not using to much, it builds up to preasure and works good, all im worried about at moment.

when it was usualy it did alot of painting, then sat around for a few years then was passed onto me and i repaired it, i think its carbon from inside the line what has come off since i have started moving it around

any idea what oil i should be using?

sam

 

[eil]

Have you checked that the inlet air filter is clean.

 

[pondy]

it was dirty when i got it, have since replaced it

 

[pondy]

any one have any info about that oil to use

 

[shenion]

Usually 30 or 40wt non-detergent oil.

My local stores have "compressor oil". No specs on it, but that is what I use. Most places that sell compressors carry it.

 

[pondy]

nothing like this on ebay, but loads of bottle just called compressor oil, ok for belt and direct drive
looks like i will use this
sam

 

[rtbcomp]

Machine Mart sell it. I'd take a guess at SAE 30. Don't bother with synthetic, far too expensive.

 

[pondy]

thanks will give it ago, hopfully the carbon will clear, does this happern on most compressor, that pipe between the pump and tank gets really hot, any pump will through oil out so im guessing it will burn up as soon as it hits that pipe
sam