JD 7320 died and wouldn't start

connaway · Sep 17, 2019

I was pulling a shredder with my 7320 when everything just went dead. Engine died and dash display just started flashing on and off. After that, it would crank but not start or even smoke. I pulled the battery cable and let it sit a while then hooked back up. The dash display reset but it still wouldn't start. I checked everything I could think of but finally called JD service. The tech hooked up his computer and the last code was unable to communicate with injection pump. He checked all the wiring from the ECU to the pump and everything was fine. Then he said it was probably my injection pump

but no way to know for sure. He was getting ready to leave but decided to check three fuses on the right side of the engine. He found one that was corroded and looked like it had been hot. He replaced it and there was a buzzing noise that started inside the injection pump (not the electric fuel pump) that I hadn't heard before. The engine started right up after that. I wanted to pass this on in case somebody has the same issue. I could have been out $$$ on a new pump which wouldn't have solved anything. Glad the tech thought to check these fuses although he didn't really know what they went to.

beenthere · Sep 17, 2019

:welcome: to TBN

Tech should have had access to the wiring diagram for your 7320.
Might be a good time for you to get your own copy of the service tech manual for that tractor to have your own wiring diagrams. There may have been a reason for the possible "hot" fuse and knowing what it is wired to may be needed in the near future. A spare fuse on hand too.
The service tech manual will pay for itself if just a dealer call or two can be avoided.

connaway · Sep 18, 2019

beenthere said:
:welcome: to TBN

Tech should have had access to the wiring diagram for your 7320.
Might be a good time for you to get your own copy of the service tech manual for that tractor to have your own wiring diagrams. There may have been a reason for the possible "hot" fuse and knowing what it is wired to may be needed in the near future. A spare fuse on hand too.
The service tech manual will pay for itself if just a dealer call or two can be avoided.

Yes, I do need to get the wiring diagram. Too many electronics on this one compared to my other tractors.

Wagtail · Sep 18, 2019

G'day Mate and welcome to TBN from Downunder.

Good to hear that your fault was corrected and thanks for sharing your experience.

Enjoy the site.

jd110 · Sep 18, 2019

If the fuse was corroded most likely the fuse holder is corroded as well. Be sure to clean the terminals or replace the fuse holder to prevent future problems. Those fuses tend to get corroded and then heat up due to the poor connection. I think the gasses from the battery helps to corrode them. Recommend using dielectric grease on the connections to help keep corrosion away.