For almost 5 years my Kubota B7800 has been great, but in the past year a problem has shown up. Namely, the tractor does not start. At first rocking the HST pedal was enough get it to crank and start. This has become much more difficult lately. First thought was the lock out switch below seat on right side. So I jumpered it. Now it starts, but still hangs in forward or reverse. I went to the service manager and parts man at my local dealer, who thought it might be the damper. This is a thing that looks like a shock absorber which is hooked to the pedal linkage. I removed it, this helped but it still hangs in gear although it is now easier to find neutral. Does anyone have experience with this problem and in particular the damper? Kubota guys thought a new one might solve the problem but were not real sure. It is a 100 dollar part. Also the Kubota guys said there is a neutral return spring on the linkage and gave me a page from the parts manual on it. With difficulty I can visualize the spring, but can not see how to get at it. Any suggestions would be appreciated. Thanks, Art
Kubota, first problem
- Thread starter Art Olive
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johnrex62
Platinum Member
Hi Art, can't offer any help but I didn't want you to think you were being ignored here. Sounds like you are on the right track and the HST pedal is not centering on it's own and causing the starting issue. I don't know anything about the linkages and what exactly promotes that action. I would try dousing everything I could reach with lubricant to see if it frees up the action somewhere, but I have never tried to take one apart and I don't know if the B series linkage is the same as the L series.
Briana03
Elite Member
Hello & WELCOME to TractorByNet.com!
I have moved your thread to the Kubota Owning/Operating Forum. You'll get a better response there.
I have moved your thread to the Kubota Owning/Operating Forum. You'll get a better response there.
Gordon Gould
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Welcome to TBN !
I don't own an HST but in the back of my mind I think I remember a thread in the past where the OP described a similar problem. Maybe you could find it with the search function. If you don't get any help you could start a new thread where you tell the problem in the title. Like "HST Pedal Won't Return to Neutral". That way anyone familiar with the problem will be more apt to look and help you out. Good Luck.
I don't own an HST but in the back of my mind I think I remember a thread in the past where the OP described a similar problem. Maybe you could find it with the search function. If you don't get any help you could start a new thread where you tell the problem in the title. Like "HST Pedal Won't Return to Neutral". That way anyone familiar with the problem will be more apt to look and help you out. Good Luck.
crbr
Veteran Member
This has been identified as an inherent problem on this particular machine (and I have read about a few other models). The search feature will turn up threads on this topic.
credit to OP
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Verticaltrx
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In the first photo, the plunger/tube is the source of the problem. My B3200 had the same issue, the problem is that even a small amount of corrosion in the tube will make the plunger hang and therefore will not allow the pedal to center. When the pedal isn't centered the tractor won't start.
I lubricated the plunger/tube assy. and it worked great. I just used motor oil from an oil can to lubricate it. Figured grease would be to heavy. The problem happened around 200hrs and I'm near 400hrs now and the problem hasn't reoccurred.
rswyan
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Was the B2910 one of them ?
Hi John, Thanks for your quick response. I have tried greasing and spraying to no avail. The movement seems free enough, but does not want to return to neutral by itsself. Currently am running with the damper removed and switch jumpered so that starting in no problem. I shift the gear trans to neutral or shut down if I get off the tractor. Art
I've had problems with small branches/twigs getting jammed in places that prevent things from moving properly, last time being the PTO lever. You might try looking really good under there with a light for anything wedged in the linkage. I have a B2710 and have read a lot about this kind of problem with pedal but have never experienced it myself. I grease the pedal every time I do the FEL, figure that can't hurt.
crbr
Veteran Member
Yes Sir.
crbr
Veteran Member
Replacement seems reasonably logical.
I had this problem with my B2620. Lubricating helped for awhile but then even lubing and moving the pedal back and forth would not help. I got stuck in the woods one day in the snow and the tractor would not start even fiddling with the peddle. I stuck a shim between the switch plunger and the tube(see pic in a previous post) and drove back to the Ponderosa.
The solution for me was to adjust that big nut on the switch (shown in a previous post with labeled adjusting nut)) moving the whole switch forward in the bracket and taking out the excessive play. No problem since. The worst part was having to take off a loaded tire on my model to get an open end wrench that large and long in there. You can test by turning on the key (don't go to start) and moving the HST pedal by hand (don't sit on the sit). You should hear a relay click as you push the pedal forward or backward and another click as it comes back to the neutral position. The clicks are slightly delayed so wait for them.
Hope this is relevant and helps. It's really quite simple and you don't need to bypass the switches, jumper things, get a new part. I can't believe the Kubota mechanics didn't know the solution unless I'm missing something. What is it with dealers - they always want to sell you a new part for something.
The solution for me was to adjust that big nut on the switch (shown in a previous post with labeled adjusting nut)) moving the whole switch forward in the bracket and taking out the excessive play. No problem since. The worst part was having to take off a loaded tire on my model to get an open end wrench that large and long in there. You can test by turning on the key (don't go to start) and moving the HST pedal by hand (don't sit on the sit). You should hear a relay click as you push the pedal forward or backward and another click as it comes back to the neutral position. The clicks are slightly delayed so wait for them.
Hope this is relevant and helps. It's really quite simple and you don't need to bypass the switches, jumper things, get a new part. I can't believe the Kubota mechanics didn't know the solution unless I'm missing something. What is it with dealers - they always want to sell you a new part for something.
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rswyan
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taborekle
Gold Member
I was looking at a shop manual for the BX, and one of the 500hr (?) maintenance items was to measure and adjust the HST pedal travel, and it had a fairly small tolerance. Don't know if that has any relationship to your tractor, but it does make me wonder.
Also, on mine, I picked up a stick in the under deck assembly and that disabled me. So to those that suggested these two courses of action, I would ditto that.
Also, on mine, I picked up a stick in the under deck assembly and that disabled me. So to those that suggested these two courses of action, I would ditto that.
Another thing to check if the pedal is not coming back to neutral and thus not tripping the relay - then you may need to grease the pedal or use a lighter grease. The fitting is not easy to see, at least on mine and there are two fittings there - one for the brake pedal and one for the HST pedal further back in behind it. My manual only showed the brake pedal fitting and does not even tell you about the HST pedal zerk thus I did not grease the HST pedal for a long time.
If the HST pedal is coming back to the neutral position ok but the relay for restarting is not tripping then you need to adjust the switch as I explained before.
If the HST pedal is coming back to the neutral position ok but the relay for restarting is not tripping then you need to adjust the switch as I explained before.
herringchoker
Platinum Member
bstrom may be on the right track. That's what happened to my B7800 when I originally posted those two pictures: the adjusting nut had loosened, allowing the switch to back off so that the plunger wasn't pushing far enough on the switch to close the circuit. And yup, it's a really awkward thing to get at with a big wrench, even after removing the wheel.
Thank you - I thought maybe I was being ignored. Glad someone else figured out the most likely correct solution as well. That's what adjustment nuts are for, to adjust when there is wear over time or in your case it just loosened up and the switch was probably slopping around and the plunger not getting depressed correctly when the pedal came back to neutral.
HST Pedal Problem
Thanks to all who posted on my Kubota problem. I was following up on the spraying and greasing suggestion, when I observed how the lockout switch was activated. Namely, there is a plunger rod coming from the the rocker pedal and going thru a locator tube to hit the switch plunger. I could not see it before because the damper was in the way. I greased the rod where it goes into the tube and this seems to have solved the problem. Apparently the rod was sticking in the tube and preventing the pedal from going back to neutral. By the way on my 7800 only the rocker pedal has a grease fitting and I have been greasing it. Have not put the damper back and the tractor operates fine without it, except that if you release the pedal quickly the tractor stops with a lurch. Thanks again, Art
Thanks to all who posted on my Kubota problem. I was following up on the spraying and greasing suggestion, when I observed how the lockout switch was activated. Namely, there is a plunger rod coming from the the rocker pedal and going thru a locator tube to hit the switch plunger. I could not see it before because the damper was in the way. I greased the rod where it goes into the tube and this seems to have solved the problem. Apparently the rod was sticking in the tube and preventing the pedal from going back to neutral. By the way on my 7800 only the rocker pedal has a grease fitting and I have been greasing it. Have not put the damper back and the tractor operates fine without it, except that if you release the pedal quickly the tractor stops with a lurch. Thanks again, Art
