Bx2350 won't turn off

[GreenYellow]

Incorrect, imagine every time to go over a bump and your tractor dies because of a loose connection most small Kubota engines power a solenoid to stop. Most of the pre emissions restricted Kubota engines need no power to operate once started. The small Kubota engines that have a keystop system to replace the old cable that you would pull to stop the engine, this allows them to put the safety circuits on the PTO, seat, and hydro pedals while also buffering intermittent breaks in the circuit to cut nuisance shut downs If the power to the keystop timer relay blows or the solenoid fails you must manually move the fuel stop lever to move the fuel rack to the stop position. Check the fuse supplying power to the seat switches, timer relay circuit and the stop solenoid. David Kb7uns

Exactly why I prefaced with not being a tractor mechanic.

I do have a great understanding of how solenoids work, but am nowhere near familiar with how kubota sets them up. With almost any solenoid, when power is removed, it goes back to its neutral state, usually by the aid of a spring. (Similar to air brakes)

A "stop solenoid" is news to me, but then again, that's relative. I'm just an electronics guy who owns a tractor.

 

[GolfAddict]

Turning the key off activates the shutoff, you can watch it pull the plunger in. After turning it off, a couple seconds later there is a "click" noise when the plunger is released to pop back out, allowing fuel to flow again when you are ready to restart it the next time.

I was sure my solenoid had gone bad, but had found a thread or two on this problem that mentioned the blown fuse. I checked, and the fuse I thought it should be was fine - it was labeled Solenoid on the fuze box cover. In my case that one was fine and I found one of the other fuses was blown, I cannot recall which. Replacing it caused the solenoid to start working again.

 

[RaydaKub]

David and Golf addict are correct. The normal state for these solenoids is to let fuel flow. When they are activated they shut off the fuel long enough to kill the engine and then release again. I guess most big diesels are set up this way now.

Imagine if you will, a tractor with a large load behind it going down a hill. This tractor is wired requiring the solenoid to be energized to run. The fuse blows for some reason and the fuel is cut off. You are now without power steering, and likely, brakes. Not cool. So to avoid that, the natural state is not energized, letting fuel flow.

 

[GreenYellow]

:whiteflag::whiteflag::whiteflag:

 

[davideoftex]

The 15 amp fuse labeled relay was blown, replaced with an extra stored in the fuse bax and it now stops engine. Reading the post above, I must admit I probably caused the problem. I was thinking the seat switch might be giving me the engine wanting to die problem and I bypassed (I thought) the switch by unplugging it and putting a wire to both sides.

 

[David_Kb7uns]

When the interlock switch circuit is broken by one of the switches opening, the timer relay is activated and turns on the fuel stop solenoid cycle and that is the click heard releasing the solenoid several seconds after the engine has stopped.

David

 

[Bob Nelson]

When the interlock switch circuit is broken by one of the switches opening, the timer relay is activated and turns on the fuel stop solenoid cycle and that is the click heard releasing the solenoid several seconds after the engine has stopped.

David

So, I know this thread is old, but in case someone reads this. I have a problem with my Kubotax bx2350d where the battery keeps being drained. When I take it out and charge it and re-hook it up, there is a clicking constantly. Maybe the fuel shutoff solenoid? Anyway, the tractor was starting and then dying after a while, maybe a minute or two. So, thinking it might be the seat switch, I bypassed it and it started, ran good, no issue. But, it wouldn't turn off. So, I disconnected the bypass wire and then when I tried to shut if off with the key it kept running. Any ideas?

 

[David_Kb7uns]

Constant clicking noise is the electric fuel pump. The Kubota Super Mini series engines have a solenoid operated by a timer that pulls on the fuel stop lever until the engine stops and then you will hear it click and release, there is no fuel run solenoid. The timer relay does this and is either activated by the key switch or the safety switches on the seat,PTO etc. Check key switch, alternator or shorted wires if battery is being run down.

David

 

[Bob Nelson]

I went out there this morning and checked some stuff. I used a VOM and the seat and pto switches are adjusted and are working properly. I took some photos and maybe someone can quide me further. This morning the battery was dead again. Completely drained. I wonder about a short because the tractor ran yesterday. Here are some photos of the engine area.

 

[rjdriscoll]

WOW! This [quote below] was so helpful! found the solenoid and fuel cutoff mechanism it actuates. Definitely my problem. Will get a new soleniod on order, but in the mean time, I can keep working. I can kill the engine by manually operating the mechanism "fuel off position". The spring keeps it in the "fuel on" position. THANK YOU, Dozernut!

Find the solenoid on top of the engine (Google, Kubota Stop Solenoid 16851-60014 for an image and prices). Use your fingers and pull the rod plunger of the solenoid out and you will shut off the engine. Push back in to start if it won't move on it's own. To replace there are two screws and an electrical plug, hook up the solenoid plunger and you are done.