b2910 will not shut off when key is turned to the off position

[Heddenonin]

I have a b2910. I am able to start and run the tractor without issue. However, when I turn the key to the off position, it will not shut off. I have to starve the engine of air to shut it down. I have been seeing posts where the issue is the key stop relay. I understand the purpose of the relay. My question is......Do all models of Kubota use a key stop relay? Or, more specifically, does the b2910 use a key stop relay? If so, can someone supply me with a part number? I am unable to locate it on any diagrams. I am also not aware where to even look to find this part on the tractor. Any help would be greatly appreciated.

 

[Henro]

Go here and download the workshop manual for free or a small donation:

http://kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=B2410_%20B2710_%20B2910_%20B7800_9Y011-13031%5B1%5D%20WSM.pdf

Look at page 9-M8

Edit: Just an added thought. I faintly remember that newer models of the B2910 MAY have a different set up, one that uses an OPC box. (Operator's Presence Controller?)

If so, you could have a newer model that is not covered by the WSM I linked to. (I am guessing about that).

Maybe someone who knows for sure can chime in. I have a 2002 B2910, and as far as I know mine does not have the OPC module, so the WSM I linked to works in my case.

Just a heads up, as Kubota apparently does change some things on models from time to time.

There is a current thread about a BX2200 that actually has the wiring of a later model BX...and the BX2200 wiring diagram does not apply to that person's BX2200.

 

[je1279]

I'm not familiar with that model but it sounds like a faulty ignition switch or a loose connection to it.

 

[PoTreeBoy]

If yours is like Henro's diagram, it requires power to run. It has 2 coils, one for pull-in and one for hold. Both are grounded through the housing.

The fuel solenoid is mounted on the injector pump and has a two-wire connector. With the engine running, pull that connector off and the engine should stop. With the key at ACC, one pin of the connector should show 12 volts. In the START position, both should be hot. If yours tests that way, your solenoid must be bad.

 

[Henro]

Go here and download the workshop manual for free or a small donation:

http://kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=B2410_%20B2710_%20B2910_%20B7800_9Y011-13031%5B1%5D%20WSM.pdf

Look at page 9-M8

If yours is like Henro's diagram, it requires power to run. It has 2 coils, one for pull-in and one for hold. Both are grounded through the housing.

The fuel solenoid is mounted on the injector pump and has a two-wire connector. With the engine running, pull that connector off and the engine should stop. With the key at ACC, one pin of the connector should show 12 volts. In the START position, both should be hot. If yours tests that way, your solenoid must be bad.

Just an added thought. If the OP's B2910 has an Operator Presence seat switch, it is likely different electrically than the diagram in the WSM I linked to. I could be full of hot air, but my memory is telling me there are B2910s out there that have a control module and the added seat switch. And that the control module is what shuts down the engine when the key is turned off.

 

[JimmyJazz]

I have two tractors a Steiner and an Allis Chalmers neither of them turn off with the key. I have to pull the air cutoff like you are describing. It never occurred to me that they should perhaps shutdown differently. You might keep yours as is. Its not an inconvenience as far as I am concerned.

 

[Henro]

I have two tractors a Steiner and an Allis Chalmers neither of them turn off with the key. I have to pull the air cutoff like you are describing. It never occurred to me that they should perhaps shutdown differently. You might keep yours as is. Its not an inconvenience as far as I am concerned.

There is no air cut off on the B2910. The OP must be opening the hood every time and blocking the air intake with a rag or something...For me that would be a major PITA...

 

[Henro]

Just an added thought. If the OP's B2910 has an Operator Presence seat switch, it is likely different electrically than the diagram in the WSM I linked to. I could be full of hot air, but my memory is telling me there are B2910s out there that have a control module and the added seat switch. And that the control module is what shuts down the engine when the key is turned off.

Having a B2910 I could not kill my curiosity.

At the very end of the WSM I linked to, there is a service bulletin dated Oct 27, 2004 that addresses the new wiring setup on the B2910, and Includes a wiring diagram. Pages following page 9S-22...

Covers the OPC circuitry that was added. Glad to find out I am not nuts after all!

 

[Russell King]

Older Kubota tractors did not shut off with the key. The key simply supplied power to instruments and the separate starter switch. The tractor would run with the switch on or off.

They had a manual fuel shut down lever.

I think some of the newer ones with the key shut down systems have some manual back up system to stop the engine but no idea what models had that. But if you’re handy you may be able to figure how to use a string tied to the correct lever of the injection pump to pull it into the off position to stop the tractor engine. Then fix it for real with the correct parts when they arrive.

 

[whitetiger]

think some of the newer ones with the key shut down systems have some manual back up system to stop the engine but no idea what models had that.

All of the Kubota engines as far as I know have a mechanical shut-off lever on the injection pump.