JD 6140d clutch issues?

[rScotty]

....SNIP...... I got to checking out the fuses and found something interesting. Previous owner installed some extra led lights, guessing he done himself and not a dealer. He had it plugged into an extra spot in the fuse box. If I unplug that fuse for the extra lights, the transmission light goes away instantly and can use it. Soon as I plug that back in, transmission light comes back on. From what I can tell, that wiring only has to do with lights and nothing else. Since the extra lights caused the transmission light to come on, why would it not do that from day one? Since it appears to be only for led lights, why is that making the transmission light come on?

OK. That makes more sense. We had a similar problem with our 310SG John Deere from the same era....2008. It is also a model from back when JD tractors just started using computers.
JD computers from that era are famous for problems. BTW, my dealer stocks those old engine computers in both new and rebuilt versions.

The transmission and engine both monitor and adjusts a lot of things like torque converters, injector timing, and shifting by using sensors for temperature, pressure, and force. What those sensors have in common is no matter what they re measuring, they send their information to the computer as changes in resistance.

The problem with thatn is that van LED is not simply a glowing resistance wire like traditional dash lights used to be. An LED is a one-way current device called a "diode". It doesn't work like a simple old fashioned dash light....it's a tiny circuit all by itself. Who know what that poor computer was thinking when it started getting that new info?? Apparently it thought something was wrong with the transmission & started modifying clutch commands.

On ours, a tiny signal wire in the harness broke, so the resistance on that sensor went from a couple of ohms to infinity - and the computer thought the engine had overheated! Emergency Alarms and Flashing Lights all over the cab. Our tractor was convinced it was having a dangerous meltdown. So much noise that I bailed out of the cab.

Apparently yours thought it was having a transmission problem.
Congratulations on finding it yourself.

Ours was $1000 labor & a new computer. Took the tech less than an hour to replace it and reprogram it to work with the serial number of our tractor.
rScotty

 

[chamber4834]

Got the issue with the transmission light figured out. On the extra set of led lights, found a black wire that was hanging loose. Got that wire grounded and now all the lights work and the transmission light doesn't come on.

The tractor is still jerky when pushing the clutch all the way down. Waiting on a new clutch sensor and see if that helps it. Here is a video of what it is doing. It feels much worse when sitting in the seat.