B2650 5amp OPC/Panel keeps blowing

[Pavedog]

I have a 2016 B2650 and has worked terrific until a couple weeks ago. I went to start it and the screen went blank and it would not start. I replaced the fuse(with the seat up) and it would start. However, when I put the seat down it immediately blew the same fuse and shut down. I unhooked the plug for the seat and it would allow me to move forward but of course because it doesn't detect a driver it shuts down. Looking at schematics online I am unsure of which of the safety switches I should focus on and how to test it beyond what I have done.

 

[Hugo Habicht]

Hello,

I had the same problem recently on an L1 tractor. From what you describe it is the seat switch the reason for the fuse blowing. It shorts one pin to ground (tractor chassis) when putting down or sitting on the seat.

I'd suggest you try to take the seat switch off and see where the short circuit is, could also be in the switch wiring. I have not done that, otherwise I could send you pictures what it looks like.

For testing (!) you could disconnect the seat switch and short the bridge the connector pins on the tractor wire harness side with a thin solid wire. If tractor runs fine then this is the fault.

 

[Hugo Habicht]

Here is part of the schematics. You find the complete work shop manual with schematics on kubotabooks.com for download.

The seat switch is supplied through the fuse (red) and so is the instrument panel. Switch output goes to controller then (yellow). When you put the seat down the cable to the seat switch shorts to chassis / ground and blows the fuse.

Check where the cable is squeezed, repair it and possibly reroute or attach with cable ties that this cannot happen again.

Good luck with the repair !

 

[North Idaho Wolfman]

@Hugo Habicht
Where did you get that schematic?
It's not a B2650, caught that right away because a B2650 does not have bi speed turn.

Same concept just the right schematic.

 

[Hugo Habicht]

@Hugo Habicht
Where did you get that schematic?
It's not a B2650, caught that right away because a B2650 does not have bi speed turn.

I got that from the work shop manual. There were three variants of schematics in it, quite possible that I picked rhe wrong one by mistake. It was not my intention to confuse matters.

 

[nbryan]

I loosely tied my B2650HSD seat switch lever in the down position with a loop of zip tie. Against the safety rules but a recent back surgery has left me unable to sit for more than a minute or so before the pain is too much.
So until I heal any work is done with me standing. Moving wood crates with pallet forks and some 3-point rotary mower work, short stints, that's it for now.

 

[Hugo Habicht]

@Hugo Habicht
Where did you get that schematic?

I had picked the ROPS version schematic

 

[North Idaho Wolfman]

I had picked the ROPS version schematic

View attachment 160886

Yea sorry wrong tractor, that's the EU version, they are really not the same tractor as the US version.
I know stupid confusing.
I didn't make their number system up, I just know how to follow it.

 

[Hugo Habicht]

Yea sorry wrong tractor, that's the EU version, they are really not the same tractor as the US version.
I know stupid confusing.
I didn't make their number system up, I just know how to follow it.

Can you enlighten me how to distinguish the US from the EU work shop manuals? I had a look through it but did not see anything obvious.

 

[North Idaho Wolfman]

Can you enlighten me how to distinguish the US from the EU work shop manuals? I had a look through it but did not see anything obvious.

First it lists models that were not offered in the US.
B2050,B2350,B3150

Second it has ROPS designs that are not available on the US models.

It has other options that are not available on the US models, like bi speed turn.

And when all else fails look up the Manual part number:

This manuals part number (last page): 9Y111-09820
The right manual for the US mode B2650: 9Y111-08222

So yea, not anything that's easy and obvious to figure out the difference.

 

[Jsjac]

When I had this problem it was an intermittent short in the neutral safety switch

 

[GreensvilleJay]

man, just wait until 'they' mandate 'driver's seat occupied' switches in cars and you eat 1/2 can of beans for lunch....

 

[Pavedog]

When I had this problem it was an intermittent short in the neutral safety switch

Was there a way to test that? I disconnected the seat switch, it no longer blows the 5amp fuse, but without it hooked up I can't operate the tractor. When the switch is in the circuit it will blow the fuse every time. I realize that can also be a problem with the OCP, so just trying to troubleshoot which it is. Where on the 2650 is the neutral safety switch?

Thanks for your help

 

[Hugo Habicht]

Was there a way to test that? I disconnected the seat switch, it no longer blows the 5amp fuse, but without it hooked up I can't operate the tractor. When the switch is in the circuit it will blow the fuse every time.

See here: Link short fault finding

For running the tractor without switch see post #2

 

[Dustball]

Was there a way to test that? I disconnected the seat switch, it no longer blows the 5amp fuse, but without it hooked up I can't operate the tractor. When the switch is in the circuit it will blow the fuse every time. I realize that can also be a problem with the OCP, so just trying to troubleshoot which it is. Where on the 2650 is the neutral safety switch?

Thanks for your help

You've already pinpointed the issue- it's the seat switch circuit. Either the seat switch itself is bad or you have a short to ground between the seat switch and the OPC controller. If you want to isolate whether it's the switch itself or not, disconnect the seat switch connector and jumper the two terminals together on the tractor connector. If you're able to run afterwards, it was the seat switch. If it still blows a fuse with the connector terminals jumpered and the seat switch disconnected, it's a wiring issue.