I am almost afraid to respond to this thread . . . I dont think anybody is trying to put anybody or anything down. We just want an answer to some puzzling findings.
I had some new findings today (Mon 11/29).
I had a chance to try another CK20HST today - this time in SC (visiting for Thanksgiving). This is the second CK20H I have sampled.
The CK20H performed exactly like the other CK20H I had tried before. It had "Weak HST", would not climb 3" step in Hi (and this was a bit of a ramped step - the edge of asphalt road). Tried all pedal movements (fast, slow, stomp), all RPM. Actually STALLED the tractor engine to full quit/stop/off one time. So this tractor gets labeled 'bad' by me as was the previous I had tried in NC.
The HST just felt weak in Low or Hi. Just not snappy (seat of pants) even on level ground. Also strained in Hi range pulling up hill out of parking lot. Definite effect of load on engine pitch. I do not agree it is 'overgeared' because the top speed does not seem any different compared to other tractors of this class.
So that is TWO (of Two) CK20H's I have tried, same poor HST results. My brother (who has small KubBX1500) was very unimpressed. Not like his HST experience at all. He also witnessed the step test and was dumbfounded.
I actually don't see how it is the bypass/relief valve. Why would the engine stall if HST goes into bypass? Relief suggests redirection of HST pressure - wouldn't that 'unload' the engine and prevent stalling? Please dont flame me if I am wrong. I know very little of HST operational detail. I am just asking a question. I guess we are all waiting (rather impatiently) for the official Kioti findings.
Now for an interesting finding.
Went to a seperate Kubota dealer. 7510HST. I understand this is lighter tractor. R4 tires.
Drove tractor, very smooth operation (steering, engine, loader). HST felt good - much 'snappier' in seat of pants.
Mentioned concern of HST for my needs (which are dragging logs, pushing up brush/log piles with loader - heavy push/pull kind of work). He suggested I do some tests.
As my previous test, the Kub passed the 3" step test at any rpm (>1300rpm), any range with almost no noticable effect on engine load. Just drove up it like there was no step at all. Just like my previous test on a different 7510.
NOW THE NEW DATA (for me at least) -
Dealer suggested another test.
Found a vertical concrete wall (4ft high), found 2x4 to place between front of tractor frame and wall. Eased tractor straight into wall (with 2x4 protecting the front end). Tractor was in 2WD low range. 2000 rpm. Push HST pedal, spins rears no problem at all. Put in 4WD Low Range, Push HST, spins all 4 no problem. R4s digging deep. Put in 4WD HI range, 2400rpm, Push HST pedal, spins all 4 no problem - in HI range. Really throws some dirt. I was impressed (but thats just me, no 'real' experience other that what I have described here and other threads). The engine really never strained much at all. Sure it had to work in Hi range, but it never felt anything like a full bog.
There is no doubt in my mind as to significant internal differences between CK and Kub HST. Please note, I am not intending to put down any tractor or manufacturer. I am just shopping for a 20hp compact tractor and reporting my findings. I do think Getut has a problem, I also think this problem exists in other CK20H's (two of two in my sampling). I hope Kioti responds soon and we get a resolution - because otherwise the CK seems a fine tractor and I would really like to buy one.