2010 struggles and sputters on downhills

Hi everyone. My 1965 Deere 2010 (gas) runs just fine except in one specific situation: Downhills while under load.

What happens is that I'll be pulling along with my 3 point disc and everything is fine. Even in soft ground where the engine labors a bit everything runs great.

But I get to any downhill and as I pull down the hill you know how it is, the tractorpicks up a little speed "pushing" against the gear instead of pulling. Then at the bottom half of the hill, the engine starts to stutter like it's starving for fuel. If I push the clutch in and stop the tractor, the engine then recovers and off I go again.

If I use the next lower gear, the issue happens less. It's like the downhill run is causing the engine to over-run the fuel supply, but it can't be that because if the supply was partially blocked, it would die under HEAVY load.

It happens in exactly the same place every time it happens. Every round, it does this ONLY on a downhill part of the round.

I was thinking maybe tweaking the load adjustment screw, but then it seems that it's not doing this under heavy loads, it's more under a light load. What else could it be?

Anyone have any idea what might be going on here?

Many thanks.

Grouse
 
Carburetor float level may be set very low. If the float hinges at the rear, going down hill the fuel level could be really
low causing the sputter.

However, is there any black smoke when the engine is sputtering. Maybe just the opposite and the engine is flooding.
 

No black smoke, so it must be starving, not drowning.

Float. Good thought.

Is there an external adjustment do you know? Or if internal, is there a screw to adjust the float setting, or is it a matter of tweaking the float arm downward?

Thanks.


Grouse
 
(quoted from post at 14:52:17 09/08/17) Carburetor float level may be set very low. If the float hinges at the rear, going down hill the fuel level could be really
low causing the sputter.

However, is there any black smoke when the engine is sputtering. Maybe just the opposite and the engine is flooding.

OK, I just rethought this and now I'm doubting the float theory.

If you stand on a hill with a glass of water in your hand, the level of the water does not change. The top of the water is level no matter what. Yes, the angle of the carb changes, but I have to think that if this uphill/downhill thing was the problem then no gas engine could run up or down hill no matter what the float setting?

Also, if if go down 2 gears, the problem doesn't happen at all. So slower down the hill eliminates the isssue. Why? Would seem to me if float setting was the cause, slower would make problem worse, not better.

Maybe I'm thinking about this wrong?

Anybody had this issue? Other thoughts on causes?

Grouse
 
Play with the adjustment screw on your fuel bowl. If you have the original carb that screw defines how much fuel the tractor is getting and they can be really hard to set right.
 

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