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Massey Harris & Massey Ferguson Tractors Discussion Forum
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DavidP - Shifting delay to avoid crashing gears

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Steven, Avilla

04-30-2008 10:43:02




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David, I have read several of your posts where you state that it is normal to wait up to 5 seconds after depressing the clutch and shifting gears to avoid crashing the gears. I'm just wondering what causes this delay? My Massey is like this and sometimes I forget and I'm sure the neighbors across the field are laughing at me. Other brands of tractors that I've used don't seem to have this special "feature."

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Wesley Stephens

05-02-2008 20:24:00




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 Re: DavidP - Shifting delay to avoid crashing gears in reply to Steven, Avilla MO, 04-30-2008 10:43:02  
I've found that our 135 shifts much smoother and there is less spin down time when it's in low multipower. Our 35 gas has always had a smoother transmission. It's pretty easy to downshift it while it's still rolling, but you can't do that with the 135 or 175, even though the 175 won't come out of low multipower.



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Danperkins

04-30-2008 15:23:09




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 Re: DavidP - Shifting delay to avoid crashing gears in reply to Steven, Avilla MO, 04-30-2008 10:43:02  
Keep in mind that many MF tractors and others have transmission brakes, sometimes these wear out and cause the long delay in waiting for the gears to stop spinning. On the 2000 series tractors you are supposed to push the clutch 1/2 way down, wait til the tractor stops, then depress the clutch all the way down to engage the transmission brake, which allows grind free shifting! If you press the clutch all the way down while the tractor is moving, the trans brake is forced to slow the entire tractor down, causing it to wear out prematurely.

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Gerald J.

04-30-2008 11:30:36




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 Re: DavidP - Shifting delay to avoid crashing gears in reply to Steven, Avilla MO, 04-30-2008 10:43:02  
Its because we are really sliding gears along a shaft changing the gear they mesh with and those gears have considerable spinning inertia and so spin several seconds sometimes. Its not like a synchronized constant mesh transmission where the shifter is shifting clutches or clutch collars with pointed teeth on synchronizer rings to make them line up no matter where they were at first contact.

Gerald J.

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DavidP, South Wales

04-30-2008 13:13:26




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 Re: DavidP - Shifting delay to avoid crashing gears in reply to Gerald J., 04-30-2008 11:30:36  
Hello,
Absolutely agreed with Gerald J. Add to that the momentum of the clutch plate when it is released rapidly probably from PTO working speed.
One old farmer-boy customer of mine had a MF35X. I can see him now. he would sit there with just his fingers resting on the main gear lever until it went in literally no matter how long it took. There was never any 'push and crash'.
DavidP, South Wales

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