Sheave Size Calculator

Prime Mover RPM

The revolutions per minute of the prime mover, which is the electric or internal combustion motor used to drive the pumping unit.

Gear Reducer Ratio

The ratio of the low-speed gear diameter to the high-speed gear diameter in the gearbox.

Prime Mover Sheave Diameter

The diameter of the sheave that is on the shaft of the prime mover.

Gear Reducer Sheave Diameter

The diameter of the sheave that is on the high-speed shaft of the gearbox.

Center Distance of Shafts

The distance between the prime mover shaft and the high-speed shaft of the gearbox.

SPM

The surface stroke rate of the pumping unit expressed in strokes per minute.

Belt Length

The total length of the belts needed to connect the prime mover sheave and the gear reducer sheave.