JD790 will not start

Galan27 · Dec 19, 2023

Camofurever1 said:
I could be wrong, but I believe the yanmar diesel in the 790 is self priming.

it is self priming but I do not hear a click off the solenoid. If I pull it out - does fuel spills out? It has 3 wires to it... how do i bench test it? Thank you

CADplans · Dec 19, 2023

If you take it out, the tractor will start,,,
BUT,, the engine has no way to shut off!!

Camofurever1 · Dec 19, 2023

Galan27 said:
it is self priming but I do not hear a click off the solenoid. If I pull it out - does fuel spills out? It has 3 wires to it... how do i bench test it? Thank you

No, no fluids should spill out. Before you pull it, take a meter and see if it is getting voltage when you turn the key on. If no voltage, then it could be a blown fuse, a bad wire, bad connector or a bad connection on the ignition switch......or, a bad ground connection.

Camofurever1 · Dec 19, 2023

I'll reference you to another site that had a discussion about the 790 fuel shut off solenoid. It seems to be a semi common problem (although I never had it with mine).

John Deere 790 fuel shut-off solenoid failing - John Deere Tractors - Popular Compact Tractors

My JD 790 failed, or appeared to fail, the fuel shut-off solenoid. With the key in thequot;on quot; position I could manually press in the solenoi

tractorpoint.com

Egon · Dec 20, 2023

Camofurever1 said:
I'll reference you to another site that had a discussion about the 790 fuel shut off solenoid. It seems to be a semi common problem (although I never had it with mine).

John Deere 790 fuel shut-off solenoid failing - John Deere Tractors - Popular Compact Tractors

My JD 790 failed, or appeared to fail, the fuel shut-off solenoid. With the key in thequot;on quot; position I could manually press in the solenoi

tractorpoint.com

Egon · Dec 20, 2023

You might have a thermistor in the solenoid wiring. They sometimes go bad.

No “click” check the thermistor first. They have been known to fail. It should be located behind the fuse block. It’s ten dollar item. Easy to access and replace.

The solenoid engages the injection pump. It does not involve the fuel supply directly.

Just look up jd thermistor. Lots of information.