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John Deere Tractors Discussion Forum

Re: Supposedly the latest greatest starter...

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Hay maker2

06-26-2020 08:58:05

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That's an OSGR Starter (Out Side Gear Reduction).

What both you and I used were the Planetary Gear Reduction.

Both accomplish the same thing, they take the high RPM and low torque of that tiny motor and reduces it to create enough power to spin the engine over. This is no different than the transmission in a tractor. If you have enough gear reduction a smaller engine can pull the same load.

The advantages of a gear reduction starter (more so the Planetary) is that they are physically smaller to they can put them in a tighter place to achieve the required output power to spin the engine over.

I am curious to know if you put a photo tachometer on the front engine pulley to monitor the actual cranking RPM of the engine. I suspect that it will be no better than the standard starter.

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06-27-2020 00:40:21

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 Re: Supposedly the latest greatest starter... in reply to Hay maker2, 06-26-2020 08:58:05  
Your dead wrong the gear reduction spins the engine faster may have get a tachometer to prove it I guess .

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David G

06-26-2020 19:38:12

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 Re: Supposedly the latest greatest starter... in reply to Hay maker2, 06-26-2020 08:58:05  
That is an interesting observation, gear reduction starters "appear" to crank faster, but may just be the motor sound. My MH44 with 6V starter on 12V cranked 300 RPM, with 12V reduction cranked 200 RPM. This starter is much easier on the ring gear, but so would 6V.

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