56 620

bobgrimes · Jan 3, 2023

My 620 has been sitting for about a month. Was running fine when parked in barn. Tried to start today and it would kick right off but only run for 4or 5 seconds then quit. Plenty of fuel to carb but seems to starve out after that. Any trouble shooting tips will be appreciated. One other thing. Humidity has been bad here and condensation is bad. Dont know if this has any thing to do with the problem. Thanks

used red MN · Jan 3, 2023

Just shooting out of left field. Is it at or below freezing temps where the tractor is stored? Maybe water/ice is a problem in your carb. Try heating it with a heat gun or hair dryer. If it is not that cold then this idea in bunk.

ET · Jan 4, 2023

Does it keep running if you hold the starter pedal down?

bobgrimes · Jan 4, 2023

bobgrimes · Jan 4, 2023

Actually it was 77 here

MSD · Jan 4, 2023

Run a wire from your battery to the dist. If it keeps running your resistor is bad or the starter switch could be also. Be sure to take the wire off when you shut it down.

bobgrimes · Jan 4, 2023

Where to in distributor. I went out this morning and put a spark plug tester in it and plenty of spark when I am on starter. As soon as I lift off starter no spark. If I keep foot in starter it continues to run.

used red MN · Jan 4, 2023

Run the wire to the terminal on the coil that does NOT have the wire to the distributor. Not sure if those Deeres are negative or positive ground but the battery post that goes to the starter is where you want to power the jumper wire.

ET · Jan 4, 2023

Resistor or starter switch is bad

PJH · Jan 4, 2023

Bob, the resistor that they are talking about is bolted to the front of the shift tower, under the hood.

Dan in Ohio · Jan 5, 2023

Bob, you say it is 77 here, are you saying you never go through the dew point as that is where the problem can start.

Just this morning I went out and tried to start my 70 gas tractor which usually starts immediately, no fire even after several tries. I got the heat gun out, dismantled the distributor and dried it with a hot air gun. Reassembled the distributor and it fired right up.

Living in Ohio we had temps similar to most of the mid west from -5 to 65 in the course of a week. I am not saying all of my tractors would not start today as usual, they did but I had been in the distributor of that 70 recently to clean and check points so that is where I went back to first.

bobgrimes · Jan 5, 2023

Yes the humidity has been terrible. I used a hair dryer and
put it on distributor etc with no luck.

Leroy · Jan 12, 2023

Keeping foot on starter continuing to run, It is not running, just being cranked with starter is making you think it is running but it is not, only starter making you think it is running.

620 John · Jan 12, 2023

I'm with ET. Check the resister and starter switch. Mine did the same thing a while back and replacing the starter switch fixed it (I'm thinking the bypass wire tab inside the switch was shorting out and causing goofy things to happen???). I remember the copper switch being very deformed from heat.

An old timer told me that points can cause the same issue. Resistance in the points won't let the tractor run on 6 volts when the pedal is let off, but will start and run on 12 volts with the pedal engaged.

56 620

bobgrimes

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used red MN

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ET

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