KIOTI HST locking up in reverse

[krmoto]

Yes do understand what you are saying, l have 7 hst machines in total, the kioti is the only machine with potentiometer/actuator HST control, all the rest are good old plain and simple linkage, even my Bobcat T200 (fully hand control) which is loaded with POT/ACT control has linkage HST, all these other machines just slow up nicely with a kind of braking resistance, thats why l like HST its so easy to use and in my experience seems a tuff and trouble free transmission but l have not got a clue how it works because never had any probs (yet) touch wood.

The thing that baffles me is the fact that the problem goes away when the tractor warms up, so think this is a clue to the problem and would suggest voltage control is ok, up until this l didn't think HST systems could actually lock up completely, but you learn something every day, but if you still think its elec? l need get multimeter on potentiometer and see if voltage is rising smoothly.
Also if the stopping distance gadget was working l might be able to dial the problem out?
Cheers

 

[justman777]

I really loved the simplicity of my first tractor--JD2305. You push on the pedal it goes. You let off the pedal it stops. But, it didn't have cruise control, no stall, etc. I guess every "feature" comes with a price, and in this case, the "price" is simplicity. I bought this tractor for the features and larger frame size, but I think if I had to do it all over again, I'd go with something a little simpler, like the DK series.

BTW, I've never noticed a difference in stopping distance using the dial thing. All seems like the same to me. The auto-throttle is handy, as is the cruise control. Never use the no-stall, which probably means I haven't really pushed it hard enough.

It's a good idea to probe for voltages. If it goes away when it's warm, may have something to do with metal expansion or grounds. You could try cleaning your grounds and see what happens. Several members on here have said there grounds are painted over and didn't really have good contact.

 

[krmoto]

Update, have now tested the 2 wires (forward and reverse) for voltages that feed the actuators which go through a hole into the transmission casing, the actuators are buried in the transmission so would need to split tractor to get at them, the voltage is 10.31v with pedals in rest position and 10.71v fully depressed, both forward and reverse read much the same only 0.1 difference so l would say cal is ok, the only thing l found a bit strange when pressing the pedals gradually is the voltage stays at 10.31v until the pedal reaches a point then the voltage jumps from 10.31v to 10.51v ish then rises gradually through to 10.71v fully depressed, both pedals do the same thing, whilst underneath l noticed that paint was off the eng/transmission nuts so think someone has been in there at some point.

Also checked the HST response dial, this has 5v feed and the output varies from 0.2v to 4.75v when fully turned, did a drive test with a marker and it does make a difference on how far it travels before stops, so it does work but you wouldn't really notice otherwise, when the dial is turned fully to the left the it takes longer for the tractor to stop.

 

[cutthroat]

Just wanted to add my two cents on this thread. I have a NX6010 HST. I was having this same problem, it was acting up in both directions. For me this issue happened after being loaded on a trailer and transported about 80 miles. I would push on the pedal, it would be slow to respond, then respond, when I would let my foot off, it would keep going and then suddenly brake. I called my dealer, he replaced the potentiometer. This made no difference. We then decided to take it back to his shop to look at. Loaded it up on my trailer, transported about 100 miles. Got to dealer and problem was gone. Problem hasn't came back since. We chalked it up to some sort of loose connection somewhere. We did do some extensive checking of all connections but couldn't find anything loose. I will reach out to him and look into the computer update.

-Craig

 

[krmoto]

Well Craig ive heard of some strange things ever but that takes some beating, the general life of a tractor is bumping/shaking around so l would be surprised if connection fault, but can't think of any logical reason it would right itself by going for a trailer ride, magic comes to mind

Just wanted to add my two cents on this thread. I have a NX6010 HST. I was having this same problem, it was acting up in both directions. For me this issue happened after being loaded on a trailer and transported about 80 miles. I would push on the pedal, it would be slow to respond, then respond, when I would let my foot off, it would keep going and then suddenly brake. I called my dealer, he replaced the potentiometer. This made no difference. We then decided to take it back to his shop to look at. Loaded it up on my trailer, transported about 100 miles. Got to dealer and problem was gone. Problem hasn't came back since. We chalked it up to some sort of loose connection somewhere. We did do some extensive checking of all connections but couldn't find anything loose. I will reach out to him and look into the computer update.

-Craig