John Deere 690ELC issues

New to the forum.

Borrowed a friends John Deere 690ELC for some farm work. Started it up for the first time when it was around 28 degrees. Slow to start but started and I let it idle for about 10 minutes. Drove it to a dead tree I wanted to push over. Everything was running fine. I had put it in E mode for this job. After dropping the tree, I noticed the engine idled down but then back up by its self. It did this another time before thumping to a stop. When I tried to restart it, it just made a grinding noise. I have tried charging the batteries up and still the same thing. I also jumped the starter and found it doesn’t seem to turn the motor. Kind of a grindy sound to it. When I turn the key to the “on” position, something activates Some kind of pump that sounds like it’s running rough. The starter it’s self wont engage with the key.

Is there a switch or something possibly on or where should I look into so I can start this thing. Thanks

sounds like the starter stayed engaged pull starter it is probably toast

I had a 690ELC, went through a starter every year... Several times it stayed engaged and totally destroyed it

I was kind of thinking the same. Any reason there is a loud humming/grinding sound when I turn the key to on though?

Starter is stuck engaged. When you turn the key on, it switches the battery disconnect on, which in turn powers the starter. Remove the + battery cable from starter and see if noise stops.

Great info, thanks!

Is there any fuel shut off valve on the 690sby chance?

Yes.. if u have the Stanadyne inj pump.. theres an electric solenoid that shuts the fuel off..
Its on/in the TOP COVER.. 2 studs + & -..12v
The - is usually grounded thru the pump body so all you have to do is run 12v to the other stud..
You'll HEAR it click..