L3830 HST Feather Step Pedal

[goneandbrokeit]

I also own a L3830. I have not had any surging problems on bumpy ground. Here is a blow up I found of the previously mentioned assembly

 

[Gator6x4]

The parts being alluded to are #160 and #190 in the information posted by "goneandbrokeit."

The part number for #160 is 76611-43320 and the number for #190 is, 32721-43350. Kubota calls number 160 a spring and number 190 damper hst. They are located where "Dargo" advised.

It would be interesting to ask the "Service Manager" what role/function these two part numbers play.

 

[JRobyn]

Yeah, and ask him why he thinks they're "internal"!

 

[pharmer-phil]

The service manager and I talked this afternoon by phone....he deferred me to the owner of the dealership.

Kind of like pulling teeth to get him to acknowledge that my friends here know what they are talking about!

Also talking with Kubota's central division service supervisor...at least I'm leaving him messages. Will be VERY interested to hear what he has to say.

Thanks to all the people who have answered...this is still playing out and I will post results. If anybody else has something to say, please post.

Phil

 

[pharmer-phil]

First of all, thanks to all for taking time to reply or comment.

To bring everyone up-to-date, the dealer replaced the dampner and spring which, was, lo and behold, EXTERNAL. But, it still does it. Last weekend, I was taking the tractor across the barnyard to hook up to an impliment (not really a situation where you'd naturally use a cruise control because I was only going about 45 yards or so) and the surging was almost violent.

I have written a demand letter to Kubota to fix it or buy it back (or give me a credit for another suitable product.)

Don't know how this is going to play out, but I consider the tractor unusable. It's a far cry from their claim in the brochure:

"The Feather-Step HST provides an hydraulic servo mechanism that reduces the amount of pressure required to depress the HST pedal. A more responsive pedal means smoother performance with increased control, regardless of the load size. The Feather-Step HST's hydrolic servo also reduces shock, vibration, noise, fatigue for an overall improvement in tractor performance and operator comfort...."

Yeah. Right.

Phil

 

[johnk]

Make sure you keep us informed as to how it is handled by your dealer and kubota. Hopefully they will live up to their reputation and make it RIGHT for you for the money spent.

 

[john_bud]

Phil,

Sorry to hear about your troubles. I looked in the WSM and it does not show this symptom in its trouble shooting tree. I do have some educated guesses that may be just as bad as the dealers, but ....

If it is fluid related, what could it be:

is the fluid up to the correct level?
is the filter clogged up?
is the screen clogged up?
is the relief valve popping at a very low pressure? Both charge pump and high pressure pump reliefs.

If it is not hydraulic (and I don't think it is as cruise works) then it must be mechanical.
Question, when you press the peddle with your hand, is it real easy to move or is there some fairly significant back pressure? (Engine off for this one!!) There should be some significant pressure, and it shouldn't work fast.
When you bottom the peddle, how long does it take to rebound to the neutral position? It may be interesting to time your tractors peddle vs ones on the lot.
I would inspect all of the linkages for looseness especially the neutral holder arm and the dampner.
Then drive a similar model on the dealer lot bring some bricks or 4"x4" posts to run over to simulate rough terrain. If they are ok, ask the service tech to swap the dampner and springs to your tractor.

I know there were some other pictures of the linkages posted, but here is the one from the WSM for the "10" series. It should be the same as the "30" series.

jb

 

[AceDeuce]

Maybe you should consider trading your HST in for a GST model. That would eliminate the "problem," whatever it may be, altogether.

 

[Dargo]

To bring everyone up-to-date, the dealer replaced the dampner and spring which, was, lo and behold, EXTERNAL. But, it still does it. Last weekend, I was taking the tractor across the barnyard to hook up to an impliment (not really a situation where you'd naturally use a cruise control because I was only going about 45 yards or so) and the surging was almost violent.

I have written a demand letter to Kubota to fix it or buy it back (or give me a credit for another suitable product.)

So far, it matches up exactly with what I had; dealer telling me that it was "internal" when I saw it was external. Also, when I pointed that out to my dealer, they missed on their first try. They used a wrong size dampener (they have several sizes - don't let them tell you they don't) and they have several different strength springs (don't let them tell you they don't). It did take a couple tries to get the right combination, but that fixed it. Actually, my dealer gave me 3 dampeners and a sack of springs and said "you know more about it than us, could you please see if you can fix it?

So, that is how mine actually got fixed. If you look at it's design, and with cruise working, you can see where what I'm describing will be the only way it can be fixed. I don't have time to train your dealer, but you did teach him that it was "external", didn't you? Try the others if you don't mind. It doesn't take 2 minutes to change the springs and dampener to check different settings. Good luck!!

 

[Jethro]

I have a B1550, so this may be completely irrelevant. My tractor took an unusually long time to come to a stop after removing my foot from the speed control pedal. Upon the service tech's advise, I removed the pedal and polished the bushings. No change. I ordered an new return spring and installed it today. During the process I noticed that there was a spring tension adjustment bolt. I installed the new spring, but the problem turned out to be that the tension was adjusted too loose.

Based on the photo of the parts drawing posted by John Bud, yours has an ajusting bolt too. If the spring is #8, the right end of it ataches to this bolt. Moving the nuts on the oposite end adjust the tension.

Tha dampener is designed to prevent exactly what you are discribing. I would suggest that you also check the parts manual against the part number he gave you.