Excerpt from Small Farm Equipment: Irrigation pumps

Pumps consist of two main parts: the pump impeller (which pushes the water), and the motor which drives the impeller. Small irrigation pumps can be gas or diesel, electric, or PTO-driven. Electric and PTO-driven pumps will seem to require less time troubleshooting—mostly because electric motors are wonderfully low-maintenance, and PTO-driven pumps are as reliable as the tractors which run them. All the same, the advice here is still worth reading: there are plenty of subtleties to the workings of pumps beyond their motors.

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