As memory serves I called IR a couple of years ago when I got the compressor. The pump itself was toast and had no compression at all.
I'd picked up 2 IR compressors, one a T-30 80gal that weighed like 600# with a 3 phase 7.5hp monster motor, dead (the pump was fine) and this 60 gal 5hp single stage for which I am seeking a capacitor. I rebuilt the 7.5hp unit w/ a new 5hp Century motor and a new Harbor Freight cast iron V-Pump on the 80 gal tank.
I plan to use 60gal tank w/ the existing IR motor and another HF V-Pump, which seem to be pretty decent pumps for the $$.
They told me that the 5hp unit was discontinued because though the motors and tanks were fine, the pumps all self destructed so they no longer offer parts or literature on them. From the pulley sizes, it appeared they ran the pumps at something like 1600-2000rpm and they were all aluminum (no mention of sleeved cylinders). I know I can pick up the pump with the pulley using my pinkie finger.
It apparently only used one capacitor because the single metal can for it (missing) would only hold one, and there are only 2 wires coming out of the case into where the capacitor can was located (a somewhat surface-rusted area outlining where the can sat).
Worth calling again, though. I get WAGs of anywhere from 175mf to 400mf, so I guess it's not a simple "formula", but depends just how the motor was wound.
If I can't get an answer from IR, is it terribly critical? In a compressor, the motor starts basically unloaded, since the pressure switch unloads the pump pressure line initially, unlike some motors that have to start under load, like a pool pump it would seem.
Bob
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