It's HP or KW on the starter's pinion shaft that turns the diesel. Unless we know the KW of the old direct drive starter and the KW of the new reduction starter. I would dare say a MT41 or MT42 Delco will turn an engine faster than the Denso or Nipper gear reduction unit Deere uses. All other factors equal a 4KW PM starter will draw less current than a 4KW conventional direct drive starter. To make power on the starter pinion, it still takes amps X volts. A direct drive starter drawing 750amp at 10V is going to out crank a PM starter drawing 500amp at 10V.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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