Still problem with tractor shutting off

[Kubota brent]

When you turn key switch .key stop fuse blows.tractor will run until you let go of switch.please help!!!!!!

 

[TnAndy]

Suggestion: Describe this a bit better, or more detail.

Like which way are you turning the key ? On....Off ?

Does the tractor have an electric shutoff, or is it manual pull something shutoff ?

Things like that will get you a much better response.

 

[Kubota brent]

When you turn the key on.it is. An electric shut off.

 

[murphy1244]

Relay not working?

 

[Kubota brent]

How can I check that? Sorr y I don't know a whole lot.just some basic stuff

 

[TnAndy]

OK....so when you turn the key to 'start', it starts, but when you release the key to the 'run' position, it stops running....is that correct ?

Sounds like a bad key switch to me, OR the wire from the switch has broken at some point.

The terminal on the 'run' part of the key switch is not keeping power to your fuel solenoid, and without that power, the spring loaded solenoid plunges forward, cutting off fuel.

First thing I'd do make sure there is a wire on ALL the key terminals on the back of the switch...it may well be one cannon plug. Then take a meter and start checking the terminals for voltage. Should have one hot all the time...your feed. Turn the key to 'run'....got voltage at one more terminal ? That's the one that should keep the tractor running.

If you have no voltage, bad switch. If you DO have voltage, start running the wire.

Does it go to a relay as Murphy said ? Turn key on/off. Relay click? Check terminals on relay for input/output. Clicking means the coil is working, but the contacts can still be bad. Relay OK ?


My money is on bad switch....since the tractor WILL run if you hold the key over a bit. That means the wire/relay are likely ok.

 

[Kubota brent]

Thanks for the help guys

 

[Sprinklerman]

Check the fuel solenoid , I had a JD diesel mower act the same way

 

[4Kings]

I'm fighting a similar issue.

I have a BX1800, essentially same tractor as you. Here's how the whole start/stop sequence works.

These tractors do not have fuel solenoids, they do have a stop solenoid however. The stop solenoid by default is in the open or start position. The solenoid is only powered when the key is turned to the off position. It gets about a 10-15 second shot of power from the timer relay which caused the solenoid piston to retract, shutting of the fuel flow and thus turning of your tractor, at the end of the cycle, the solenoid return to the open/start position.

So the first thing to check is when you turn the key off is the stop solenoid retracting. If it's not it, then check the plug from the tractor to the solenoid to see if 12v is present when you turn the key off.

If you have no power at the plug, and it will only be energized for about 10-15 seconds, you have a bad timer relay.
If you do have power when you turn the key off, theyn you have a bad stop solenoid.

 

[TnAndy]

Hmmm...if the default position is OPEN, then wouldn't he have the exact OPPOSITE problem....the tractor would never stop until it runs out of fuel ?

The way I understand the problem (and maybe I'm not getting it) is the tractor will run when he turns the key to the 'starter' position on the key, but as soon as he releases it to spring load into the 'run' position, the tractor dies.

If it takes power to operate the stop solenoid to cut fuel flow, and that is only on the key 'off' position, then where is the power coming from in the 'run' position ??