Kubota Tractor Engine Starter Motor | OEM 6C140-59210

Somewhere around 1995 Kubota shrank the starter rather than the engine. The B1700's three-cylinder diesel is no great lump, but the bay around it is not generous, and the answer was a permanent-magnet motor built by Mitsubishi with a reduction gear set between armature and pinion so the body could stay short and still crank with conviction. Twelve volts, 0.9 kW, and an eight-tooth pinion — that last figure is the one to carry into a parts conversation, because the nine-tooth motors of the neighbouring family sit in the same catalogues and look near enough identical in a thumbnail. Two ears instead of a flange, and the whole thing hangs off the block.

OEM and Search References

• Primary Kubota reference: 6C140-59210, carried forward as 6C140-59211, 6C140-59212 and 6C140-59213
• Related prefix: 6C040-59212, close enough in the tables that buyers confuse the two
• Mitsubishi codes: M0T90281 and M0T90282, permanent-magnet reduction with two-ear mounting
• Aftermarket: 410-48222, 91-27-3328, 1900-0111 and S-8925, with Lester 18396
• Ratings: 12 V, 0.9 kW, 8 teeth, clockwise rotation, two-ear flange, engines D722 to D1305
• Buyer search terms: 6C140-59210 starter, Kubota B2400 starter motor, B1700 starter 12V, Kubota 6C040-59212

Fitment and Purchase Checks

Model years are a weak filter here, because the ranges overlap at both ends. Three of these tractors — B1700, B2100, B2400 — share the 1995 to 1999 window exactly, and a buyer holding one of them has no reason to look past the engine code. Then the B7500 and B2410 arrive for 2000, the B7510 and B7610 for 2004, and the B2630 carries on until 2012, six years after it first appeared.

The starter did not follow the sheet metal. What changes is whether the pinion in the box has eight teeth or nine, and that takes under a minute to answer with the old unit on the bench and a light on it.