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Leesburg, Ohio | We have had the same system, but branded Farm Fans, for four seasons now. (It's a Farm Fans design, all owned by the same outfit now, I think.) It is taking dry grain away from a Farm Fans 2125 dryer at about 800 to 900 bu/hr. It is only rated at 700 bu/hr with the single phase 15hp motor that we have, similar to your's. Our runs are fairly short, (about 140' tops), and our capacity increased this year by about 100 bu/hr after we moved our dryer to it's new location closer to the leg and bins. (Longest run used to be about 200'.)
It makes a big difference how the grain pipes are routed, and the number of turns in the grain path. Each turn is equal to another 20' of pipe. vertical or sloped runs are equal to double the pipe length. Do everything you possibly can to eliminate turns in the grain pipe. The air pipe from the blower to the airlock is not critical...if you have to choose between turns in the pipe after or before the airlock, make them before.
I would start by checking amperage draw and voltage on your 15 hp motor if you haven't already. I don't think a small increase in pulley size on the motor would hurt anything, and long as the amperages stay where they should.
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4 inch Pneumatic Grain Transfer Systems
