I found a broken Campbell-Hausfield 12V air compressor while riding a motorcycle in the desert. I am financially impaired so when I find something, I take it home and try to fix it. I have been using this compressor for years, now. (About 7) and have used it for everything from patching and filling tubes to seating beads on my motorcycle.
It is getting a little worn out, requiring a shot of oil to get up to 40 PSI. God provides-I just received a broken "Maxx Power" air compressor!
I will show you the basic steps needed to get one going again.
P.S. the main image is what the Campbell-Hausfield compressor looks like today, after 7 years of often hard use. If I had the ability to buy a (Good) new one I would! But they can last.
Step 1: First off, take it apart (Phillips head screwdriver)
Inside is a very simple mechanical assembly.
A motor turns a gear that is connected to a crankshaft.
The crankshaft is supported by two bushings, and has a shaft that is connected to the connecting rod.
The connecting rod is connected to the piston, which moves up and down in a polished metal cylinder.
While the piston is traveling down, a one-way reed valve allows air to be drawn in through a small hole on top of the cylinder head.
While the piston is traveling upwards, the pressure closes the one-way reed valve, and pressure builds up until it is pushed through the one-way valve that is connected to the gauge, and output barb, travelling to the chuck.
9 times out of 10, with inexpensive 12V compressors, the entire assembly simply lifts out.