Originally Posted by lsocoee
Cool thread. I've got an old as dirt Speedaire compressor. It probably has about a 10 gal capacity and gets up to 80psi. This has an electric motor attached to a belt that runs a pneumatic cylinder. I keep this one on all the time for airing tires, blow gun, and quick jobs. I've got another compressor that I use for my nail guns.
Anyway, I added some pneumatic oil to the compressor and now when my compressor gets to 70+psi it starts to shake a bunch. What do you think is going on? Should I remove some of the oil?
Actually a little ironic that you asked this considering the recent posts on this forum about synthetic vs. standard oil.
What you have is a single-stage (belt driving one single piston) electric compressor. I would guess around 2-3hp. If you can be a little more specific on what oil you put in the compressor, it could help. But like any old motor or engine, if you put new oil in, it can break sludge seals and loosen old gaskets. What I see quite often are old compressors that people try to "revive" by changing the oil out. This can actually crack the seals and gaskets and unbalances the single piston (starts shaking) while it trys to hit peak pressure.
I would replace the oil one more time with proper synthetic compressor oil and see if it helps. If not, your pump is pretty much shot. If you are handy and can find the parts (pending age of the compressor) you may be able to rebuild the cylinder, otherwise you may be in the market for a new one.
A compressor that size are not that expensive. If you are interested in a new, PM me and I can try help ya out.
But get back to me on the "pneumatic" oil you used and lets see if we can fix the old dog.