Keystone compressor motor won't

2 Problems...First, It could use a set of rings, which I assume I will have to have custom made. Keystone is long out of business.I have noticed over the years it is taking longer and longer to build up a full tank. It still was quite useable during normal everyday shop operations, but if I got into using the bead cabinet it wouldn"t keep up.

The worst problem as far as I"m concerned is that the motor doesn"t make a peep when it is turned on anymore. If I manually flick the starter mechanism, it still doesn"t do anything at all. Last year I had to replace the capacitors as they had corroded and melted off the connectors on a couple. It is an old 1950"s machine with the motor one would expect on it. I think it is a GE if I remember correctly.

Should I find an old tyme motor shop to fix the motor, or should I purchase a new 7HP 1760? Rpm motor and bolt it up instead? The machine has a huge flywheel on it, and two cylinders to run, one high , one low pressure. I really hesitate to go and buy a new compressor, don"t think any out there are as durable as this one was.

Any thoughts..???

Sounds like it is time to $hit can it you probably spent more than it worth'

Sounds like it is time to $hit can it you probably spent more than it worth'

Remember we're talking 1950's 7.5 HP, not the inflated ratings of modern stuff. This thing ran an entire Chrysler dealership with six lifts and a one bay body shop back then. (120 gallon tank, too!)

Otto gas engine works in Elkton Md can supply the rings. They have a web site. Mine got slow a few years ago, and when I pulled the heads to check both head gaskets had part of the webbing blown. I took some Teflon rub rail from a semi trailer, and a jijsaw and cut new ones. The home made gaskets have held for years. What worries me is, if the stainless steal reed valves go bad I don't know what you could use.

It is worth a new motor If that is what you have to do. Mine came from a large trucking company. It will put 160 lbs. in the 120 gallon tank from dead empty in less than five minutes. A new compressor of equal quality would cost thousands now.

After thought,be sure your magnetic relay is not bad. It has three circuit breakers in it.

How do you test the magnetic starter? I can wire a house no problem but I don't understand these things and haven't found a book to follow. I did the capacitors as they had an obvious problem and I got lucky last time. Now it has power to everything that should but no go. I tried to manually trip the starter but that didn't work.

Sure is a serious machine. I bet it would outpump any t-30 IR 7HP unit on the market today, and they seem to be the best out there.Kinda reminds me of a two cylinder JD with the size of that first stage piston!
Thanks for the website help.
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