creeping hydro..

[gravelman]

gravelman here..pardon me if i asked about this before but..i have a Kubota 2650 600 hrs.. it is a 2016 hydro when i "think" im in neutral and set the brake...get out ofcab, the tractor starts to creep forward..all on its own. Obviously this is extremely dangerous. Any advice on what may cause that... have to fix pronto...thanks

 

[Threepoint]

Gravelman, have you checked for any debris that may have gotten in, under or around the HST treadle peddle and associated linkage? It doesn't take much to prevent the HST peddle from fully returning to its neutral position. That can cause creep.

 

[s219]

Forward and reverse do this, or just one direction?

 

[number two]

Let's not forget that the hydro pedal pivot must be well-greased to allow it to return to the "neutral" position.

Good Luck!

 

[gravelman]

all good comments...i have thoroughly checked for debris...none...i have greased and lubed everything. I can actually walk away from the machine 10 feet and see and hear it start to lunge forward...have not seen it go backwards. It is usually always when i have been driving forward and stopped. It also does this with force as the bucket has dug into the ground. Think of what could happen if someone was in front of this hooking up a chain or something. I really feel it must be in the valving etc??

 

[John_Mc]

Not sure what your linkage and system looks like, but it sounds as tough whatever is supposed to return the pedal to neutral is not working. You say it usually happens when you have been driving forward and then stop. Does it still happen of you back up a few inches before setting the brake and hopping off the tractor?

My pedal occasionally sticks slightly - usually the only indication is that I can hear it straining against the brake. If I go tap the pedal backwards a bit (I have one pedal that rocks forward and back, rather than 2 separate pedals) it will go all the way to neutral and stop straining.

 

[gravelman]

i fully understand what you are saying. Mine is the same as your..i peddle on a rocker..front and back. It has not done it in reverse and when it does happen.. the machine sounds and appears to be in neutral. There is no straining noise whatsoever. THEN without warning..it starts straining to go forward.. it scared the heck out of me the first time it did it..

 

[skipperbrown]

Let me get this straight: You set the brake, the tractor is stopped, you get out, and then it begins to creep forward after a few seconds? Every time or just every once in a while?

The unexplained issue I'm having with my 2650 is whenever I have the pto lever set to rear or rear/mid pto, the rear pto shaft spins without the pto being engaged. It can be stopped by grabbing it and barely spins my rototiller and auger and is easily stopped by holding the pto shaft of either. When on the mid pto only, the rear pto is locked. Looking at the shop manual, I can't find what the problem is. My Kubota service manager has never heard of it happening.

 

[gravelman]

i have never heard of that pto problem...can't help you on that. Yes, i set the brake..tractor is running at an idle and within a few seconds or even a minute..it starts to creep forward with force. NOT every time...that is the scary part...you never know when.. so i have been shutting it down before doing any chaining or stuff like that out front.

 

[Peter 315]

My buddies was doing it also the peddle was flopping around the dealer changed the gas strut and something else...

 

[gravelman]

ok i have a dealer close by...it is probably something the dealer will have to attend to.. thanks all

 

[radios1]

there has to be an adjustment on the pedal linkage that fixes that, it has to be adjusted properly with the tractor on jack stands so it don't move while you are adjusting it!. the service manual will tell you how to do this, or have your service center do the adjustment. if you look down at the bottom of the page, you'll see "similar threads" not for your tractor, but it gives a good idea where to start..

 

[gravelman]

OK thanks very much

 

[pipedin]

OK thanks very much

I realize this thread is a bit old but thought I'd pass on my experience in case it is of help. Last winter one time I had moved the tractor out of the garage to warm up at idle and the tractor shut off when I got off to put up the ROPS. It wouldn't restart until awhile later despite moving the pedal around to try to find neutral. It didn't happen again so I never figured out the problem until yesterday when I was doing some grading and found the tractor would start to creep or would shut down when I got off to change the blade angle. When it shut down it did not want to restart though as before eventually did. I didn't see anything wrong with the pedal or linkage from underneath but when I removed the small plastic cover on the operator station (cab version may be different) I could see that the bearing on the neutral arm was not consistently returning the cam on the shaft for the HST swash plate to dead centre. Sometimes this was off just enough to creep, sometimes far enough to creep and trip the neutral switch. The design seems to rely on the cam/bearing/spring to hold the HST swash plate in neutral but if the spring can't overcome friction and force the bearing right to the centre of the cam the pedal might initially put the HST at neutral but vibration will be able to move the HST away from neutral. I first cleaned all the dust and debris from the cam and bearing with a significant improvement, the bearing now moved the cam to dead centre. I then cleaned and lubricated all the linkage pivots and it got smoother still. I pivoted the bearing off the cam and checked the bearing turned smoothly and with the pedal moved off the neutral switch checked the switch wasn't sticking or binding. I haven't had chance for extensive use but a few tests in the driveway and the bearing/cam seems always to return to and stay at neutral now. As an added bonus the occasional jerk when starting the tractor moving seems better, probably a combination of lubricating the linkage and not having the neutral bearing jump around on the cam. I don't have a MMM but if your problem is same as mine the little plastic cover gives full access to the cam and bearing, just not to the linkages and neutral switch.

 

[gravelman]

I realize this thread is a bit old but thought I'd pass on my experience in case it is of help. Last winter one time I had moved the tractor out of the garage to warm up at idle and the tractor shut off when I got off to put up the ROPS. It wouldn't restart until awhile later despite moving the pedal around to try to find neutral. It didn't happen again so I never figured out the problem until yesterday when I was doing some grading and found the tractor would start to creep or would shut down when I got off to change the blade angle. When it shut down it did not want to restart though as before eventually did. I didn't see anything wrong with the pedal or linkage from underneath but when I removed the small plastic cover on the operator station (cab version may be different) I could see that the bearing on the neutral arm was not consistently returning the cam on the shaft for the HST swash plate to dead centre. Sometimes this was off just enough to creep, sometimes far enough to creep and trip the neutral switch. The design seems to rely on the cam/bearing/spring to hold the HST swash plate in neutral but if the spring can't overcome friction and force the bearing right to the centre of the cam the pedal might initially put the HST at neutral but vibration will be able to move the HST away from neutral. I first cleaned all the dust and debris from the cam and bearing with a significant improvement, the bearing now moved the cam to dead centre. I then cleaned and lubricated all the linkage pivots and it got smoother still. I pivoted the bearing off the cam and checked the bearing turned smoothly and with the pedal moved off the neutral switch checked the switch wasn't sticking or binding. I haven't had chance for extensive use but a few tests in the driveway and the bearing/cam seems always to return to and stay at neutral now. As an added bonus the occasional jerk when starting the tractor moving seems better, probably a combination of lubricating the linkage and not having the neutral bearing jump around on the cam. I don't have a MMM but if your problem is same as mine the little plastic cover gives full access to the cam and bearing, just not to the linkages and neutral switch.

Ok on that...it is never too late to discuss this stuff. that is exactly what my machine was doing and this is very very helpful...thanks