Pro 4000 3.5 hp capacitor values

by Steve
(Fullerton, CA)

3.5 hp capacitor, also piston (dual opposed), replacement parts


I need the start and run capacitor values for Devilbiss 3.5 hp Pro 4000, 20 gallon, 150 psi, horizontal, 1992, Airfree compressor.

I know now that I'll have to take the motor in to one of the local electronic parts houses, and ask them to match it up with the capacitors.

One time I tried that with another motor, and they couldn't do it do to lack of markings on the motor.

One time I got the capacitor values by calling the manufacturer of a 1960's model of 3HP motor. They still had the specs, so I was in luck, except the motor has poor power factor (common design weakness for motors from that era).

I also need a dual opposed piston for this machine.

By all appearances, one is on one's own, and will have to make substitutions of parts. I think I will replace the pump with a oil sump type. Fortunately, I've got one of suitable size for this machine (about a hundred years old, but it's very efficient and still working).

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Devilbiss Compressor Issues.