They never where the best starting tractor to start with. Never under 35-40 degrees without block heater or either. They also are very sensitive to crank speed. If it is not spinning over really well it will not start. Also make sure the hydraulic pump is destroking. If it is not that will make them start hard. Make sure your batteries and cables are good. Check to see what voltage you have at the starter while cranking.
I have found two bad starter solenoids in the last two weeks making slow cranking tractors. Contacts burnt and not making good contact. Caused a big voltage drop to the starter armature. Found it on both with just a volt/ohm meter. So check while cranking: 1) at the positive terminal on the battery right before the starter 2) At the battery cable at the starter 3) at the output side of the starter solenoid.
When I over haul a JD 4030 with the 329 diesel. I always used the kit for a combine. The JD 4400 & 6600 diesel both had higher compression pistons and the same cylinder liners. That will make it start much better.
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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