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| Usually was determined by the original power unit that was on a particular well and the pumping capacity of the well. Automotive engines running on propane or natural gas make their power at higher rpm’s so they have a deeper reduction.
Medium duty diesels V8’s like the 3208 and DV-550’s ran at 2300-2800 rpm and would often have 5:4 or 11:10 reductions.
HD I-6 diesels typical ran between 1800-2200 rpm and would often have 1:1 or 11:10 reductions.
Depending on the gear head manufacturer you could swap the input and output gears and reverse the ratio.
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Irrigation well gearhead ratios
