Genesis Experts

Larry NCKS · Jun 12, 2019

There's a fellow on the Genesis page that claims he can make an 18 speed out of 16 speed and vice versa by reprogramming. I say he can't and that they're all 18 speeds. It's a matter of gear ratio on the F2 clutch that either put the overlap in 8 & 9 or take it out. Which of us is correct?

Larry NCKS · Jun 12, 2019

Oops! this is on the Genesis page on Facebook.

Sean in PA · Jun 13, 2019

I'm not that familiar with those later tractors, but the parts drawing for the 8970 does show separate part numbers for the F2 clutch shaft & cannister assembly between the 16 and 18 speeds. In fact there are 4 part numbers listed, one for 18 Speed W/Creeper, another for 18 Speed L/Creeper, yet another for 16 Speed W/Creeper and finally one for 16 Speed L/Creeper. So I would tend to think that you are correct, you can't just change the programming.

Bern · Jun 13, 2019

You're both right. The trans is an 18 speed inside (3x3x2), however the NA versions were programmed for 16
speeds using that ingenious overlap of the high-low ratios to avoid the harsh 8-9 and 9-8 shift that the
8x30 series suffered with. So the fellow is right in that he can turn an 18 into a 16 and vice versa. The
main point here though is that it makes no sense to do it, because by turning a 16 into an 18 for example,
you'll have a situation where the tractor speeds up, slows down, then speeds up again, all while
progressively upshifting. It would make the unsuspecting operator think he's losing his mind.

Hey Larry, I just thought of a good April fools prank to play on you. I do owe you one, as I'll never forget
your hypothetical and yet impossible SOS troubleshooting post that sucked me in a few years ago!

Larry NCKS · Jun 13, 2019

(quoted from post at 07:41:45 06/13/19) You're both right. The trans is an 18 speed inside (3x3x2), however the NA versions were programmed for 16
speeds using that ingenious overlap of the high-low ratios to avoid the harsh 8-9 and 9-8 shift that the
8x30 series suffered with. So the fellow is right in that he can turn an 18 into a 16 and vice versa. The
main point here though is that it makes no sense to do it, because by turning a 16 into an 18 for example,
you'll have a situation where the tractor speeds up, slows down, then speeds up again, all while
progressively upshifting. It would make the unsuspecting operator think he's losing his mind.

Thanks! So electronically he can do that, but he still can't make a 25 mph tractor out of a 19 mph tractor without changing F2 gearing or vice versa. Correct?

Hey Larry, I just thought of a good April fools prank to play on you. I do owe you one, as I'll never forget
your hypothetical and yet impossible SOS troubleshooting post that sucked me in a few years ago!

I can hardly wait! :lol: :lol: [/quote]

Bern · Jun 13, 2019

Correct. To make a 19MPH tractor into a 25 MPH tractor would require some gear swapping internally, along
with a software change to avoid an awkward gear ratio clash in the 8-9 range.

Genesis Experts

Larry NCKS

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Larry NCKS

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Sean in PA

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Bern

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Larry NCKS

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Bern

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