1999 L3710 HST Engine won't shut off with key

[NoTrespassing]

Does anyone have any idea why the engine doesn't stop when I turn the key off on my L3710? I can also remove the key while it's running. The electronics all shut down and gauges go to zero but the engine keeps running. I have to pull the fuel shutoff knob to kill it. It's not a big deal but it's bothering me anyway. Any suggestions are appreciated. FYI, I have a lot of squirrels that love to chew wires. I don't know if they've been on the tractor or not but they've really done a number on our cars and truck.

Thanks,
Kevin

 

[k0ua]

Does anyone have any idea why the engine doesn't stop when I turn the key off on my L3710? I can also remove the key while it's running. The electronics all shut down and gauges go to zero but the engine keeps running. I have to pull the fuel shutoff knob to kill it. It's not a big deal but it's bothering me anyway. Any suggestions are appreciated. FYI, I have a lot of squirrels that love to chew wires. I don't know if they've been on the tractor or not but they've really done a number on our cars and truck.

Thanks,
Kevin

I am guessing here but it is possible you do not have a fuel shut off solenoid on that tractor. You mentioned a fuel shutoff knob, and I am assuming it is on or under the dash. If that is the case, and you have the manual fuel shut off knob under the dash, then this is normal operation.. A diesel does not need any electrical system to run, once it is running. My B7500 was like you just described.. shut off key, take it out and the engine would continue to run until you manually shut off the fuel with the knob.

James K0UA

 

[xerman]

Ditto to what kOua had to say. I have a B7100 that my son-in-law borrowed the other day. He drove it a mile down the road to his house then called to ask how do you turn it off. He had turned and removed the key and it was still running. I told him to push the throttle all the way down. That is the way it has worked from brand new.

 

[KennyV]

Your fuel shut off is not functioning (it is mounted next to the Injector pump).
You may have a blown fuse Or an open wire going to that solenoid...
Either repair the problem OR use the pull 'kill'cable.

 

[k0ua]

Your fuel shut off is not functioning (it is mounted next to the Injector pump).
You may have a blown fuse Or an open wire going to that solenoid...
Either repair the problem OR use the pull 'kill'cable.

yep I took the time to look up your diagram for the injector pump on the Kubota website, and looks like you DO have a fuel stop solenoid. Obviously it is not working. disregard what I said earlier about maybe not having one.. My B7500 did not have one, and relied on a fuel stop lever with a pull cable and knob under the dash.

James K0UA

 

[NoTrespassing]

Thanks all, I will be looking into the fuel stop solenoid/fuse when I get a chance. That's pretty much what I expected. In the meantime, I'll be using the manual shut off.

I've owned this trator for several years and this is a new problem. It's been parked outside under a tree next to the woods for about a month. I'm thinking those pesky squirrels have been on it. I will update when I figure out the cause.

 

[normvp]

I have a GM Diesel pickup that developed this problem. I found that if I rattled the gear shift lever the engine would stop. I finally found that the battery cable grounding strap had broken. The body was not grounded to the engine.

Replacing the battery ground cable solved the problem.

The reason that rattling the gear shift would stop the engine was that the drive train was providing an intermittent ground. probably not good for polished, hardened, machine surfaces that were involved.

 

[KennyV]

... In the meantime, I'll be using the manual shut off.

That will work fine... Just don't forget to also turn the key Off... (keeps from discharging the battery)... KennyV

 

[DML1214]

My 3710 just started doing the same thing, plus it's blowing the 40 amp main fuse. I bought a couple fuses to try to troubleshoot, but at $5.00/ per fuse, I dn't enjoy not finding the source of the problem, so I brought it to my local dealer. They worked it for a couple hours and couldn't figure it out either. I'll have to put my shade tree hat back on and look for the problem. If any of you users have any other ideas, I'd be glad to hear it. Thanks

 

[Leejohn]

Doesn't the stop solenoid have to have 12 volts for the tractor to run? If so the plunger is staying in and not shuting the valve. Broken spring or rust, If it needs 12 volts to shut down, then the battery would go dead.

 

[DML1214]

Doesn't the stop solenoid have to have 12 volts for the tractor to run? If so the plunger is staying in and not shuting the valve. Broken spring or rust, If it needs 12 volts to shut down, then the battery would go dead.

Thanks for your input. We'll check it out.

 

[countryguy1225]

My background is in EE but thats a long time ago. so a blowing fuse means very high current. And this is usually typicall of a short (obviously). The trick is to understand how to isolate the short. My days- WE used a simple volt-Ohm meter. Use the Ohm/resistance settings. Try to disconnect parts and look for a 0 to a few Ohms short across parts. I do not know this tractors electrical layouts... but if you have those or can fine them. (a "Schemo" /Schematic) I'll review it for you. That was my life long ago.

Can you Tell me where that Fuse goes to? a starter or Soleinoid? Start disconnecting things you can and use the Ohm meter leads and Ohm them out. All the best and good luck.
CG

 

[David_Kb7uns]

Doesn't the stop solenoid have to have 12 volts for the tractor to run? If so the plunger is staying in and not shuting the valve. Broken spring or rust, If it needs 12 volts to shut down, then the battery would go dead.

No most Kubota engines use a key stop system where when the tractor key is turned off a timer relay fires off the stop solenoid for a few seconds usually long enough for all motion to stop. There are some engines with a three wire solenoid where they have a two windings where one is for stop and one for run.



David Kb7uns

 

[Leejohn]

I would never guessed that. I can hear mine snap open and close. I think I well put a volt or test light on it to see just what is going on. Thanks

 

[DML1214]

My background is in EE but thats a long time ago. so a blowing fuse means very high current. And this is usually typicall of a short (obviously). The trick is to understand how to isolate the short. My days- WE used a simple volt-Ohm meter. Use the Ohm/resistance settings. Try to disconnect parts and look for a 0 to a few Ohms short across parts. I do not know this tractors electrical layouts... but if you have those or can fine them. (a "Schemo" /Schematic) I'll review it for you. That was my life long ago.

Can you Tell me where that Fuse goes to? a starter or Soleinoid? Start disconnecting things you can and use the Ohm meter leads and Ohm them out. All the best and good luck.
CG

Thanks for your reply. I haven't had time to look at it again, but the fuse is a 40 amp slow blow, intended to protect against wrong battery connections. since I was driving the tractor when it failed, it obviously isn't because the battery cables are mixed up. There must be a failure somewhere in the wires between the battery and the starter, or in the ignition system. Perhaps this weekend, I'll be able to get under the hood again to check out a few likely causes.

 

[Leejohn]

David Kb7uns
I checked my B7800 and the fuel soleinoid opens when I turn the key to give it 12v. It stayed on until I turn the key off. I didn't check my L4240 it might work as you said.

 

[David_Kb7uns]

They will vary some but, in my bunch 3 of them have external 2 wire solenoids that are fired by the stop timer and attached to stop lever. The GL is internal plunger on pump and may have 2 or 3 not sure right now. On the BX and the G you can turn key off and hold lever until the cycle quits and it will run until it lloses prime from the electric lift pump not pumpin. The older Bs not familiar with so it may be different.

David Kb7uns

 

[DML1214]

Thanks all, I will be looking into the fuel stop solenoid/fuse when I get a chance. That's pretty much what I expected. In the meantime, I'll be using the manual shut off.

I've owned this trator for several years and this is a new problem. It's been parked outside under a tree next to the woods for about a month. I'm thinking those pesky squirrels have been on it. I will update when I figure out the cause.

The same thing recently happened to my L3710, but I haven't investigated why yet. I assumed it was some type of electrical issue. The manual shutoff works fine, but now that's it's warming up outside, I'll be warming up to doing some troubleshooting. Thanks for posting and thanks to all who replied.

 

[NoTrespassing]

The same thing recently happened to my L3710, but I haven't investigated why yet. I assumed it was some type of electrical issue. The manual shutoff works fine, but now that's it's warming up outside, I'll be warming up to doing some troubleshooting. Thanks for posting and thanks to all who replied.

Gosh, I wish I would have followed up on this thread and explained how I fixed it. I think I replaced the solenoid but I can't swear to it as my memory is very foggy on this after almost 12 years. I checked my email for a Messicks receipt and didn't find one. The problem may have fixed itself for all I know. I can tell you I don't have to use the manual fuel shutoff now but that's all I can say.