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8N Gear Ratio

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Dan (Wis.)

04-10-2000 09:21:10




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Purchased a 1949 8N with a Sherman step-up (overdrive underdrive), tractor has a loader and heavy duty back blade, fluid in tires. When I tried it out the gear ratio in reverse seemed very high even in underdrive. Backing it on the trailer it really "lugged" down, however I didn't smell the clutch slipping. Researched the gear ratios for the 8N and NAA tractors with step ups, they are identical until you get to reverse, then the 8N seems to be geared much higher! Anyone else run into this problem? Any info would be appreciated! Thanks! Dan

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Pete (Wis.)

04-10-2000 22:21:09




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 Re: 8N Gear Ratio in reply to Dan (Wis.), 04-10-2000 09:21:10  
What you have is a Sherman step-up with straight gearing and overdrive, same as my '47 and yes, they do back up mighty fast. What we need is a step-up,step-down aux. to slow that baby down. I believe this the case and I also think that at or near the '52 model they redid the gear ratios to slow them down in reverse. Maybe someone could help us both if I'm wrong.



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Salmoneye

04-11-2000 01:28:53




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 Re: Re: 8N Gear Ratio in reply to Pete (Wis.), 04-10-2000 22:21:09  
The link below has a couple of tables that may be what you are looking for. They show 'stock' gearing for the 9N/2N and the 8N, and the relative over/under with a Sherman installed.
Hope this helps!

Paul II



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fessman

04-10-2000 18:23:07




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 Re: 8N Gear Ratio in reply to Dan (Wis.), 04-10-2000 09:21:10  
I have the same difficulties backing up. I have a loader on the front, filled tires, and a counter weight (small drum filled with concrete) on the back. The problem is backing up a hill. The tires usually spin, and if they don't the motor bogs down. The solution in the past was not to get into the situation of having to use reverse on a hill. This summer I will try it out without the bucket (heavy full width) on it.

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Gaspump

04-10-2000 09:41:37




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 Re: 8N Gear Ratio in reply to Dan (Wis.), 04-10-2000 09:21:10  
Only the later of the 1952 8'Ns had the lower gear ratio like the NAA's. All prior 8N's had the higher speed reverse. Are you sure you have an over under sherman? If you do it will also have direct. Usually the reverse is satisfactory in underdrive but still on the fast side.



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