JD X749 Dying after 30-45 minutes

[Kyle_in_Tex]

Here's another JD overheat thread...
https://www.tractorbynet.com/forums/john-deere-lawn-garden/355570-deere-site-reviews-indicate-x754-2.html

 

[Diggin It]

Fuel Sender in tank
New P/N
FUEL LEVEL SENDER, WITH ANGLED CAP

A fuel sender doesn't have anything to do with sending fuel to the engine. It's a float switch that sends a signal to the fuel gauge on the dash.

Now that everybody is mentioning it, the one problem I had with my JD5300 was when it suddenly died, and was caused by the most repulsive looking crap in the fuel pick up line.

Algae. Are you using any kind of biocide in your fuel?

 

[Kyle_in_Tex]

A fuel sender doesn't have anything to do with sending fuel to the engine. It's a float switch that sends a signal to the fuel gauge on the dash.



Algae. Are you using any kind of biocide in your fuel?

It could be clogged.

 

[Mike VS]

Here's another JD overheat thread...
https://www.tractorbynet.com/forums/john-deere-lawn-garden/355570-deere-site-reviews-indicate-x754-2.html

I didn't read anything there that seems like my problem.

 

[Mike VS]

A fuel sender doesn't have anything to do with sending fuel to the engine. It's a float switch that sends a signal to the fuel gauge on the dash.



Algae. Are you using any kind of biocide in your fuel?

No, to be honest I never have. I guess I will from now on.

 

[Kyle_in_Tex]

Here's another JD overheat thread...
https://www.tractorbynet.com/forums/john-deere-lawn-garden/355570-deere-site-reviews-indicate-x754-2.html

I didn't read anything there that seems like my problem.

On that thread, their mower deck PTO's are cutting off from over heat. Just wondering if your's has a system that cuts off the whole thing?

 

[Mike VS]

On that thread, their mower deck PTO's are cutting off from over heat. Just wondering if your's has a system that cuts off the whole thing?

Not that I'm aware of. If I hit the brake or back up, it will disengage the PTO, but I haven't seen it ever turn off.

 

[radios1]

On that thread, their mower deck PTO's are cutting off from over heat. Just wondering if your's has a system that cuts off the whole thing?

the only thing that will shut down a diesel engine is the fuel cutoff solenoid which is not the problem because it gets constant power, so it's not that, so it can be a blockage somewhere, or the fuel lift pump is cutting out..

 

[Mike VS]

the only thing that will shut down a diesel engine is the fuel cutoff solenoid which is not the problem because it gets constant power, so it's not that, so it can be a blockage somewhere, or the fuel lift pump is cutting out..

Yes, at this point I'm sure you are right. Now I have to find time and start checking all the lines. But you have to admit... it is really strange that a blockage is stopping it like clockwork after 45 minutes or so.

 

[Mike VS]

Some of these units are set up so that if they begin to overheat, the PTO will be purposely shut off to lighten the load.
No, that doesn't apply here, but that is what Kyle was getting at.

That was one of my early tests when it would die. I would immediately disengage the PTO and see if the engine would come back to life, it had no effect. I might be able to get on those fuel lines today and end this once and for all.