Tractor won't stay running?

[straps57]

LS XR4040 Shuttle Shift

Turn the key motor turns over and and runs until the key is let back from the start position immediately dies. With the key held in the start position motor revs up. Going to go start trouble shooting but would love some suggestions.

 

[LouNY]

On many of the larger tractors the fuel solenoid has two windings a start winding and a run winding,
they also may have two relays a start and a run relay.

 

[snymat68]

I had the same problem on my tractor. My fuel shutoff solenoid has 2 coils, "pull" and "hold". It takes 30A to pull the solenoid open, but only 1A to hold it open. On mine, the "pull" coil runs off the starter circuit with a 1sec timer built in to shut off that coil so it doesn't burn up. The "hold" coil on mine runs off a different circuit and holds the solenoid open until the key is turned off. The issue with mine was that the wire for the hold coil has rubbed through and shorted to the frame, which popped that fuse. So my tractor would start and run fine for 1 second, until the pull coil released. Since the hold coil wasn't energized (blown fuse), the tractor would then shut back off. It took me a while to track the problem down to the wire. I thought it was the solenoid at first. Not so. Check your fuses. If one is blown, replace it and see if it fixes the issue. If it blows again, either you have a shorted wire somewhere, or the solenoid is shorted internally.

 

[straps57]

Pre fuel filter filled with sludge. Going to replace it and the fuel filter tomorrow. Hope that is it.

 

[thepumpguysc]

& just exactly HOW does a dirty fuel filter affect the electrical starting circuit.??
The answer is in post # 2 & 3..

 

[straps57]

& just exactly HOW does a dirty fuel filter affect the electrical starting circuit.??
The answer is in post # 2 & 3..

Because I'm not a mechanic and the fuel shut off solenoid online is about $1500. No blown fuses. No loose or broken wires that I can find yet. I changed the relay out for a know working one and it didn't fix the problem. Really hoping it isn't the solenoid itself. Will get back to working on it next week. Thanks for all the input everyone.

 

[LouNY]

That is one high priced solenoid,
can you see the actuating end of yours?
Or is it bolted right to the injection pump?
Some pictures might help.
Some times they can be mechanically held open.
I have seen a bungee cord used to hold one in the run position and if was physically pushed to shut down.

Have you checked for voltage getting to the solenoid with the key in the run position?

 

[snymat68]

You should also be able to check the resistance (in ohms) of the coil in the solenoid.
Ω = 0 = dead short internally = bad solenoid
Ω = 1 = wide open internally = bad solenoid
0 < Ω < 1 = should be in this range (specific value depends on solenoid)

 

[papachaz]

Because I'm not a mechanic and the fuel shut off solenoid online is about $1500. No blown fuses. No loose or broken wires that I can find yet. I changed the relay out for a know working one and it didn't fix the problem. Really hoping it isn't the solenoid itself. Will get back to working on it next week. Thanks for all the input everyone.

take that in to your local NAPA or O'Reilly Auto Parts and see if they can cross reference it. Maybe even check a new holland dealer and see if they have it less, since odds are high there's a very similar New Holland model tractor....

 

[thepumpguysc]

Can u post a pic of the solenoid.??
MOST of them have the part # ON the solenoid.. that way u can search it by the actual P# & not by the tractor mdl.
Good luck.