Compressor won't build pressure past 50 PSI.
 

Need some help w my oil less compressor , I replaced both pistons, rings(seals), gaskets and o-rings and on start up it won't build pressure past 50 PSI.

I left a comment on the Sears tech blog ... no one has replied, anyone have a solution to this? I was wondering if the pressure switch is faulty, but how do you test the switch?

Any suggestions would be appreciated!

Michael

I had one that did similar, It was the reed valves, one was broke off, so air was being pushed back out of the cylinder into the atmosphere, not in the tank.



http://i.ytimg.com/vi/9tbJ6Xo26v8/maxresdefault.jpg

Pic may not be exact one, but shows 6 little reed valves. Air is sucked in past them, but when compressed it seals & blows through a single valve.

Other side looks like:
http://ecx.images-amazon.com/images/...UL._SX466_.jpg

SAMCKITT --- but then you're compressor ran non-stop but didn't make pressure --- Not sure if Michael is having that same issue or not.....


So Michael --- it it builds to 50 psi and shuts off -- sounds like either your motor is overheating and you're getting a thermal shut off --- OR your pressure regulator is acting up. I don't know how you'd test that.

Yes, ran non stop.

Thanks for sharing!
 

I inspected the reeds and clean what little dirt was on them and re installed, here are a couple pixs with the heads off and new gaskets and o-rings installed.
http://imagizer.imageshack.us/v2/102...901/pX4TpG.jpg
http://imagizer.imageshack.us/v2/102...913/WYXEVb.jpg
http://imagizer.imageshack.us/v2/102...633/btSDUg.jpg

Pic may not be exact one, but shows 6 little reed valves. Air is sucked in past them, but when compressed it seals & blows through a single valve.

Other side looks like:
http://ecx.images-amazon.com/images/...UL._SX466_.jpg[/QUOTE]


My compressor also runs non stop ... just makes 50 psi and no more! There is air being sucked into the intake, ie. no blow by or restriction.

Greg .... how do I tackle this problem? Can the shut off switch be bad if the motor continues to run, don't make no sense!

Thanks for helping .... I need my compressor up and running!

Michael

If air pressure only builds to 50 psi, & motor runs on & on, then air has to be escaping somewhere. Now that I think about it, I also had to replace the one way valve on the tank where tube from compressor enters tank. Maybe that is bad. Let it run until you get 50 PSI & shut it off & listen for air leak.

A check valve? If that's bad wouldn't the compressor shut down, or no?

There is no sound of air leaking after I shut it down, Huh .... is there a universal part? Guess I could remove it and test it first ... then look for a replacement.

Thanks again for chiming in ....

I really have no idea where to go from here... it doesn't make sense that the compressor would "run on" - yet only make 50 psi - if the regulator was bad. To me that would allow the compressor to run on and NOT shut off... or wouldn't let it start.... but if the compressor is making "only" 50 psi - and continues to run without building pressure.... something else must be going on. What that is - I have no idea.

Thanks
 

At first I did the dummy check ... is it really only 50 psi? I use the air hose and point it at your face :lol: ... yep 50 psi! Regulator checks sat!

I went ahead and ordered a check valve for the input port just in case, but the way I understand it ... if the check valve was inoperable it would direct the pressure to the relief switch and it would shut down, right??

There is no air that I can feel coming outa the port either .... the saga continues.

Thanks for commenting Greg...

When my check valve went out it let compressed air out to the atmosphere. You could hear it.