Kubota B26 Shutting off randomly while operating

[Ylr]

Hi Everyone,

my Kubota b26 has been shutting off randomly. It will shut off while digging or just driving around and using the bucket. That being said sometimes it will run for a couple hours without any issues. my property has many slopes. Most of the time the tractor is shutting off while going up or down a slope. It makes me think it’s some sort of tipping sensor maybe? Sometimes once it shuts off it won’t let me start it back up for a few mins, not sure why there is a delay on starting it back up. This makes me think again it’s some sort of safety switch.

a little background when I purchased the tractor the seat sensor was broken from the seat itself just hanging on the side. I looked online and found a way to bypass it. I thought that was the problem but it keeps on happening.

does anyone know if there is an additional sensor on this tractor that kicks on when the tractor gets to a certain slope degree and shuts off to prevent the tractor from tipping over?

I also checked the fuel filter and it seems clean but didn’t replace it yet.

thank you in advance!

 

[GreensvilleJay]

this... It will shut off while digging
I don't know exactly what a B26 is.....but...
seems to say you have a backhoe on it. if so there's usually another 'safety switch' on/near the seat.
see if you can get the WSM for the wiring diagram.
as a switch was busted when bought, could also be a frayed/damaged wire randomly shorting out,so look real good where the seat switches are.

 

[fried1765]

this... It will shut off while digging
I don't know exactly what a B26 is.....but...
seems to say you have a backhoe on it. if so there's usually another 'safety switch' on/near the seat.
see if you can get the WSM for the wiring diagram.
as a switch was busted when bought, could also be a frayed/damaged wire randomly shorting out,so look real good where the seat switches are.

A B26 IS a dedicated backhoe machine!

 

[Smokeydog]

Suspect seat presence switch first. Moving around on slopes could trigger it.

Plastic seat bottoms, age and hillside farm aren’t good for seat switch life on our farm. Neither is needing to stand to see with some FEL operations. They get replaced with weatherproof rubber switch to make an anti-theft feature.

 

[85Hokie]

When this cuts off - does it slowly cut off ? Like sputter or just like someone pulled the off switch?

Jay,

this is the B26:

 

[Ylr]

When this cuts off - does it slowly cut off ? Like sputter or just like someone pulled the off switch?

Jay,

this is the B26:

View attachment 123599

when it shuts off, it feels like someone just turned the key to the off position, engine completely stops regardless of what rpm it was on.
I did check the seat presence sensor mentioned on the other reply. The bolts that are holding the sensor down seem to be loose enough to allow a bit of wiggle on the sensor. I tighten them down to see if that’s the problem. That being sometimes even when I get up from the seat it will try to shut off the same way.

 

[GreensvilleJay]

I wondered as often you see incomplete model info posted...
and of course Kub Cda parts was 'out of order'....

 

[Garvini]

You need to completely bypass the seat switch and see if that solves the problem or not…I had some broken plastic that holds the switch so mine stays bypassed…just make up a short piece of wire with male spade connectors and replace the switch with that

 

[fried1765]

You need to completely bypass the seat switch and see if that solves the problem or not…I had some broken plastic that holds the switch so mine stays bypassed…just make up a short piece of wire with male spade connectors and replace the switch with that

BINGO!

 

[Garvini]

the b26tlb isn’t really a dedicated backhoe, it has a three point hitch setup with a rear PTO but the backhoe is pinned right to the mainframe not to the TPH like other attachments and it has a separate hydraulic pump

 

[North Idaho Wolfman]

the b26tlb isn’t really a dedicated backhoe, it has a three point hitch setup with a rear PTO but the backhoe is pinned right to the mainframe not to the TPH like other attachments and it has a separate hydraulic pump

Hate to disagree with you but the B26 is a true TLB (Tractor, Loader, Back Hoe).
As the BH is on a subframe 4 point mount.
But more importantly is that fact that the hydraulic pumps and systems are designed around the Loader and BH being used for extensive length of times without over taxing / over heating the system.

 

[fried1765]

the b26tlb isn’t really a dedicated backhoe, it has a three point hitch setup with a rear PTO but the backhoe is pinned right to the mainframe not to the TPH like other attachments and it has a separate hydraulic pump

Hate to disagree with you but the B26 is a true TLB (Tractor, Loader, Back Hoe).
As the BH is on a subframe 4 point mount.
But more importantly is that fact that the hydraulic pumps and systems are designed around the Loader and BH being used for extensive length of times without over taxing / over heating the system.

YUP!
The B26, the L47, and M62 are the current "dedicated" models.

 

[Garvini]

Hate to disagree with you but the B26 is a true TLB (Tractor, Loader, Back Hoe).
As the BH is on a subframe 4 point mount.
But more importantly is that fact that the hydraulic pumps and systems are designed around the Loader and BH being used for extensive length of times without over taxing / over heating the system.

so how does the BH attach on its little sister the b2601…isn’t the BH mounted on the TPH?

 

[North Idaho Wolfman]

so how does the BH attach on its little sister the b2601…isn’t the BH mounted on the TPH?

It mounts to a subframe too, almost all of the BH's do now.
The TPH mounted ones cause too much damage.

What makes the B26 a TLB and not a tractor with a BH is the hydraulic system and heavier loader.

 

[North Idaho Wolfman]

The BH's between the two are not the same, the TLB uses a much heavier built BH.

Difference is a B26TLB comes with a BH and the three point is optional.

Where the tractor, b2601, the three point is standard and the BH is optional.


Here are the 2:
They technically do not call the mount on a B26 a sub frame, just the frame.
as it's just part of the tractor build.
And FYI they also call it a MAIN FLAME...

You can see a huge difference in the two.

B2601 Subframe

 

[North Idaho Wolfman]

Here is the page from the WSM that explains what's all involved with the system.

 

[fried1765]

The BH's between the two are not the same, the TLB uses a much heavier built BH.

Difference is a B26TLB comes with a BH and the three point is optional.

Where the tractor, b2601, the three point is standard and the BH is optional.


Here are the 2:
They technically do not call the mount on a B26 a sub frame, just the frame.
as it's just part of the tractor build.
And FYI they also call it a MAIN FLAME...

You can see a huge difference in the two.

View attachment 123640

B2601 Subframe
View attachment 123637

I could likely do just fine with a B26 TLB, but I shall NEVER surrender my VERY low hour L48 TLB.
No anti pollution garbage or potentially troublesome electronic on my l48 either.
(I do realize that the B26 is not required to be Tier IV compliant, but the L47 and M62 TLBs are).

 

[Garvini]

That excellent…thanks for explaining that

 

[Ylr]

Suspect seat presence switch first. Moving around on slopes could trigger it.

Plastic seat bottoms, age and hillside farm aren’t good for seat switch life on our farm. Neither is needing to stand to see with some FEL operations. They get replaced with weatherproof rubber switch to make an anti-theft feature.

The seat presence switch is this correct? (See photo attached) It was loose, I tighten the two bolts holding it in place and the tractor wouldn't start. I remove the sensor and taped the lever in place so it wouldn’t move. I was able to operate the tractor for about 3 hours without any issues shutting off. I’m assuming the sensor is bad so I’ll order a new one and replace it.

 

[North Idaho Wolfman]

The seat presence switch is this correct? (See photo attached) It was loose, I tighten the two bolts holding it in place and the tractor wouldn't start. I remove the sensor and taped the lever in place so it wouldn’t move. I was able to operate the tractor for about 3 hours without any issues shutting off. I’m assuming the sensor is bad so I’ll order a new one and replace it.

Yep that looks like your issue!