This is in regards to a possible upgrade of my compressor from 3 HP motor to 5 HP motor.
I called Curtis Toledo today. Gave them my pump number (ES30). To my surprise, the service rep told me that the pump IS rated for 5 HP motors. I told him that my guess is that the person from whom I got it, repowered it for 3 HP single phase himself as part of a single phase conversion.
Anyway. This IS a 5 HP compressor that is now being driven by a 3 HP motor, so, upgrading it is a no brainer.
Its maximum RPM is listed as 945 RPM, according to Curtis Toledo.
I will check the single phase rating of its current pressure relay, I may need to upgrade to a bigger pressure switch, or install a separate contactor.
>> This is in regards to my compressor
>> It is currently powered by a 3 HP Baldor motor. I came across a 5 HP
>> baldor motor, very similar, just a little bigger. I would like to know
>> what would happen if I tried to run the pump faster with a bigger
>> motor. Would it overheat or otherwise destroy itself from running 2/3 >> faster?
> I swapped out a 1800 rpm 3 hp motor on an old Champion compressor I have
> been using to run my shop. I had a 5 hp 3600 rpm motor that I installed with
> the same pulley. It has been humming along that way for eight years and
> daily for five years with oil changes and a belt tightening once in a while.
> I had to treat it to new valves last year but that was not a result of the
> increased speed. When I bought the valves from Phillips Air Compressors in
> Chicago, Fred the partsman claimed the compressor to be late 40s vintage
> with the RE8 pump being made till 1956.
> I am currently installing a 7.5 hp Speedair pump and motor on a 125
> gallon tank I picked up. The tank had a 20 hp three phase motor and a big
> assed three cylinder compressor on it. I had to replace the tank as some
> fool did a scary weld patch on the 80 gal tank the Speedair came with. If
> any one wants either the 20 hp motor or pump contact me as I would sell both
> for scrap price. Mid MN is the location.
> I would recommend contacting the manufacturer as the pumps have quite a rpm
> range they can run safely at.