B26- Runs but shuts down before moving

[Chickentractor]

I have a B26 with 150 hours on it. It starts and idles well. When I put it in gear it will creep forward and back, but if I depress the speed control pedal past a creep it shuts down immediately. There seems to be a clicking noise that corresponds with the amount of pedal depression that causes the shut down, like a safety switch.

I have eliminated the seat switch as the cause, and moved on to the neutral safety switch. It looks to be working properly but I have not attempted to adjust it. All references I can find suggest the tractor shouldn't even start if this switch is malfunctioning.

Should I proceed with adjusting the neutral safety switch or does someone have another idea? Thank you.

 

[sandyc]

IMHO I would bypass the switch, ie hold it closed, and see what happens. I had the same problems with an old 2200 and a 2620 I had and zip tied the switch . Problem solved. When I traded them in I showed the dealer the zip tie and mentioned he might want to fix the switch.

 

[k0ua]

The tractor "thinks" you are not in the seat, therefore when you press the "go" pedal the engine fuel stop solenoid snaps shut. Seat switch has 2 sections, test it with a good VOM or replace it or bypass it.

 

[Chickentractor]

The results are the same with the switch wired, not wired, or bypassed with a jumper, so I believe it is not the seat switch (at least not at the switch end).

 

[davesl708]

If the safety switches are failing you will not be able to start. Since it starts and idles I would inspect the linkages and see if a wire is being pinched when you move the accelerator.

Can you track down the location of the click you are hearing?

 

[ritschner]

Download this http://www.kubotabooks.com/AutoInde...Manuals/&file=Kubota BX1860 BX2360 BX2660.pdf

In section 6-M5 (page 275) there is a diagram of the seat switch harness. There are two fuses (no 1 & 3), the OPC timer (no 4), and a relay (no 8), that need to be checked in the seat switch circuit besides the seat switch. I am not sure on the component locations on the BX26.

 

[Chickentractor]

Thank you. It is a B26 so I will look up the same for that model.

 

[mikesee]

Check fuel water separator, if it is cold and there is water in there and it's frozen engine may not be getting enough fuel

 

[woody]

my B26 has done this, check the switch in front and slightly under the seat that lets the tractor know the seat is in the forward facing position.

 

[powerstroke444e]

Seat switch or seat rotation switch b26 has 2 switches

 

[woody]

been a couple of days but was curious what the op found.

 

[Chickentractor]

Woody, thanks for asking.

SandyC gets the credit, it was the HST switch. I pried it free and tied it closed with a zip tie and had a great day on the tractor.

Now I need advice on the HST switch. I don't understand how it works, first of all. Once I understand this, it will help me either determine if I can adjust the switch or if it needs to be replaced.

 

[Chickentractor]

Let me rephrase that last post. I understand how the switch physically works. I don't understand why there is a hydrostatic transmission switch? What is the purpose? If I screw the adjustment nuts down so the post is always partly retracted (remember, the tractor is shutting off when I push the pedal and the switch post is fully extended), what danger am I exposing the tractor to?

 

[powerstroke444e]

Sounds like the HST switch worked fine but a seat switch is not letting the tractor know you are in the seat.

 

[k0ua]

Sounds like the HST switch worked fine but a seat switch is not letting the tractor know you are in the seat.

Yep. seat switch. The HST switch is working as it should..

 

[woody]

the lever on the switch I described before will be out of alignment and will not be making the switch up.