Anyone actually flipped a HST CUT pulling from the 3pth?

[mfl_jr]

Here is something to think about. When I got my DK40se with HST and I was learning how to use the HST (previous tractor was JD 790 gear) I ran into a handful of our fences. What would happen to me is I would be pushing snow and headed for an open gate. With a good bucket full of snow and icy conditions steering would be limited and the wheels would be slipping/spinning. Sometimes I wouldn't be lined up but would keep pushing untill I was a few feet out, the plan was to stop back up and adjust. What would happen is a few feet from the fence I would let go of the peddle and try and back up but the HST would keep going and slowly slow down even if I hit the breaks, and I would run into the fence. The gear tractor would stop dead as soon as I pushed the clutch and break. I have experienced this while towing a trailer up hill as well. I was climbing a steep hill in low and one of the trailer tires caught on a rock and stopped it and the tractor didn't want to stop. The front started to lift and when I tried to stop it kept turning regardless of how hard I was on the breaks. The hill is steep and rocky and the old 790 always struggled but all it took was breaks and clutch and things would go back to safe in an instant, the HST has to slow itself down. I have learned that with an HST if you start to spin even if you are still progressing forward if things start to go bad it will take alot longer to make corrections.

Edit: I tow the the trailer from the draw bar but it is a well balanced trailer and there is generally almost no weight on the tractor

My comment here is kind of off topic, but what you describe here is not right. When you let off the hydro your tractor should stop RFN (Right Friggin' Now). If your tractor keeps going "a few feet" once you have let off the hydro pedal then please have it looked at and fixed before it causes someone to get hurt or killed.

mfl

 

[Apsterbobed]

My comment here is kind of off topic, but what you describe here is not right. When you let off the hydro your tractor should stop RFN (Right Friggin' Now). If your tractor keeps going "a few feet" once you have let off the hydro pedal then please have it looked at and fixed before it causes someone to get hurt or killed.

mfl

When I first got it I asked the dealer and was told that was normal. It seemed strange to me but they told me that's just how they work, I think I got a lemon anyways I had a bunch of strange issues.

 

[buickanddeere]

My comment here is kind of off topic, but what you describe here is not right. When you let off the hydro your tractor should stop RFN (Right Friggin' Now). If your tractor keeps going "a few feet" once you have let off the hydro pedal then please have it looked at and fixed before it causes someone to get hurt or killed.

mfl

" breaks" ???

 

[txdon]

My comment here is kind of off topic, but what you describe here is not right. When you let off the hydro your tractor should stop RFN (Right Friggin' Now). If your tractor keeps going "a few feet" once you have let off the hydro pedal then please have it looked at and fixed before it causes someone to get hurt or killed.

mfl

Are you saying the wheels stop immediately and start to skid. No they do not. Of course it slows down quickly, your speed is the factor on how many inches or feet before your tractor is at a complete stop. If you are pulling an non-movable object from down low (like a box blade that hangs on a stump) your back wheels will start to spin if in low or the motor will die if in M or H. In low the tires will stop rotating when you lift off the pedal - I have not tested to see how many inches of revolution the tire makes but I think you reaction time would be the deciding factor in this case.

 

[k0ua]

When I first got it I asked the dealer and was told that was normal. It seemed strange to me but they told me that's just how they work, I think I got a lemon anyways I had a bunch of strange issues.

I will guarantee you if your DK40se rolls more than a few inches in L range after you let off of either pedal you have a problem. In Med and High, and you are running full bore down the road, sure they will roll a few feet, more so in HI than MED of course as you are going faster.
But even in those ranges it stops PDQ. I can be going down a steep hill in Low range and let off of the pedal, and it will stop RIGHT NOW.

If yours does not.. something is wrong. You should never need to use your brakes in any dynamic stopping situation.. just let off of the pedal. If you are pointed down hill, eventually the charge pump pressure will bleed down, and you will have to apply either brake or reverse pedal to keep from "drifting" downhill. But this is several seconds after your tractor has stopped by letting off of the pedal.

 

[k0ua]

Are you saying the wheels stop immediately and start to skid. No they do not. Of course it slows down quickly, your speed is the factor on how many inches or feet before your tractor is at a complete stop. If you are pulling an non-movable object from down low (like a box blade that hangs on a stump) your back wheels will start to spin if in low or the motor will die if in M or H. In low the tires will stop rotating when you lift off the pedal - I have not tested to see how many inches of revolution the tire makes but I think you reaction time would be the deciding factor in this case.

There are differences in brands and models, of how soon they stop. The machines with more dampening on the pedals and the hydraulic control of the swash plate on the hydrostat can have more roll out. In fact with the Grand L's the rollout is adjustable from the panel. The standard L machines with the direct foot controlled swashplates have much less roll out. To the point that some models stop so darn fast the people complain about being thrown over the steering wheel or neck snapping in reverse. Yes that bad. My old L3400hst was so abrupt that you could spin the tires on some surfaces by changing directions abruptly with the treadle pedal. Of course the cure for that is to operate intelligently and not just yank your foot off of the pedal all at once but to make smooth directional changes by "modulating" your foot.

On my Kioti the swash plate is controlled by a hydraulic servo so it is not as abrupt as the old Standard L Kubota, but still stops plenty fast in L range. A few inches..

 

[mfl_jr]

Are you saying the wheels stop immediately and start to skid. No they do not. Of course it slows down quickly, your speed is the factor on how many inches or feet before your tractor is at a complete stop. If you are pulling an non-movable object from down low (like a box blade that hangs on a stump) your back wheels will start to spin if in low or the motor will die if in M or H. In low the tires will stop rotating when you lift off the pedal - I have not tested to see how many inches of revolution the tire makes but I think you reaction time would be the deciding factor in this case.

No, not 'stop with a skid' but the quoted post said that he was pushing "a good bucket full" of snow. With a load like that when he let off the hydro he should have stopped RFN, not several *feet* later and against the fence. Based on his description of how his tractor is behaving, something is wrong with this tractor and it needs to be fixed before someone gets hurt.

mfl

 

[CalG]

No, not 'stop with a skid' but the quoted post said that he was pushing "a good bucket full" of snow. With a load like that when he let off the hydro he should have stopped RFN, not several *feet* later and against the fence. Based on his description of how his tractor is behaving, something is wrong with this tractor and it needs to be fixed before someone gets hurt.

mfl

Hydros should stop wheel rotation immediately the pedal goes to neutral. Give it a thought, neutral is but a fraction of a degree from reverse. (or FWD for that matter)

it's all in the linkage adjustment!

 

[Luke'sScreenName]

Wow. Still nothing. Maybe some of the 'chicken little' warnings will stop?

Probably not. Humans are incredibly bad at assesing risk.

 

[Everhard]

Fire dept's go to these kinds of accidents (typically deaths) all the time. Case in point I know of such an accident last year. Pulling that caused the tractor to flip over.

Now regarding the whole hydrostatic drive issue - yes there's a chance you could get your foot off the pedal BUT if that's what you think is going to keep you safe chances are either Murphy or Darwin are going to be giving you a visit one day. Just as much as a geared tractor operator that says ya I'm ok because I've got the clutch covered.
Here's another bit of food for thought for you: I've been to plenty of accidents where the driver needing to mash the brake accidentally mashed the throttle instead. Then they swear up and down there was a problem with the car/tranny/brakes etc but the end result was the wrong pedal was pushed because go figure we're all human and we all make mistakes. I can see a tractor operator hammering down on the hydro go pedal accidentally - when things don't go as planned people panic and then reactions can be completely erratic.

And that really is the bigger point with this whole how can we safely pull with our tractors - there's safer ways and less safe ways. regardless of your transmission type. You choose to do what you want. Me, I've witnessed plenty of people with very little mechanical aptitude operating equipment and it's painful to watch. They don't react when something happens or react painfully slow. Put that person in a position where a tractor could roll over and I wouldn't want to bet that they won't roll over. (And that's with them on a hydro tranny tractor.)

That said I'll go back out to my geared tractor.

E.