300U engine drag

Dave H (MI) · Nov 13, 2017

Listening to the engine, it sounds good but about every 5-6 seconds there is what sounds like a brief load on the engine. More of a drag than a hesitation. You can hear it clearly, count to six, then again, etc etc. PTO on or off. Cant figure it out. Any suggestions? This happens sitting still or moving.

RBoots · Nov 13, 2017

Loose wire causing it the alternator to lose excitement then re-excite? How's the hydraulics,no levers sticking? Fast hitch settling and readjusting? I dunno, something to think about I suppose

Janicholson · Nov 13, 2017

The test is simple the cure not bad. Put the fast hitch all the way down. Listen to the sound you describe. As you lift the hitch, does the periodic sound go away? If it does, the hydraulic pilot valve is going on demand and then off, then on demand and off. There is a screen on the valve that gets plugged up. and a pilot orifice in the center. The pilot can get plugged, and is sometimes too small. drilling it out to .040. is also useful. It is located in the regulator safety block between the rear hitch lever, and the reservoir casting. Jim

Farmaller · Nov 13, 2017

I had one that did same kinda thing, the timing was off

Tom Dowling · Nov 13, 2017

I'd bet on Jim's reply, hydraulic issue.

RBoots · Nov 13, 2017

Aside from that issue, Dave did you get it so it'd start reliably when it's cold?

Dave H (MI) · Nov 13, 2017

I found in the Spring that there was a good bit of water in the carb. It started great after that, but the weather had warmed. Today was the first time trying after really cold weather. It was difficult but I got it running. It would fire right up, then stall. I am not sure it is charging currently and will keep looking into it. It never sits outside now. I need it to run the cement mixer all day tomorrow. Hoping it gives me no trouble.

Russ from MN · Nov 13, 2017

Me too! The fast hitch is cycling. If you hold your hand on the pressure line from the pump you should feel it.

gab · Nov 13, 2017

My Super C does something like that if its idleing with the snow plow off the ground. Don't think it does it with some thing on the Fast Hitch, just the touch control arms, must be a seal leaking.

BarnyardEngineering · Nov 14, 2017

Dave, do you use the choke?

When the weather cools off, it's hard to find an old-school carbureted gasoline engine that will start and run without using the choke to some degree. Usually if you're not right on with the exact amount of choke, the engine will stall a couple of times before enough heat builds in the cylinders to keep it running. This is just a normal fact of life with these old tractors. You can drive yourself nuts trying to tune it out but you never will. As long as it runs well once it's warmed up a little, that's all you can ask for.

Dave H (MI) · Nov 14, 2017

I replaced the choke cable in the Spring. It was part of the process of trying to get the old girl back into winter operation. The old cable was no longer operating the choke. I use it, just not helping at the moment.

300U engine drag

Dave H (MI)

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RBoots

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Janicholson

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Farmaller

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Tom Dowling

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RBoots

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Dave H (MI)

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Russ from MN

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gab

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BarnyardEngineering

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Dave H (MI)

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