past ck20 hst problems?

cag · Jan 4, 2006

I can do some work with my CK30 HST in high gear but it as it's limit, for example I can push snow as long as it's not the wet heavy stuff, I can use the 3pth snowblower, I also use it for FEL work, I do lot's of road travel for the snow removal and in one particular area of the city there is a pretty good incline, I'm able to go up in high range but one as to ease up on HST peddle when the tractor start to slow down (about half way up) all of the above is best performed in MID or LOW gear but I like to see the limits of the tractor, I can't give any example for the BH I don't have one, I too incline to agree with Dargo, good point...cag

RedRocker · Jan 4, 2006

( I guess I didn't understand the operation of the HST. I didn't grasp that the power is related to how hard you push the pedal. And you're absolutely right that my tractor wouldn't go over a 4x4 in from a dead stop in the highest gear.

To reveal further ignorance, let me ask this: do you drive an HST model exactly like you would an automatic transmission on a car? Or do you do something with your left foot on the "clutch" simultaneously? I've never even seen one, so
bear with me! /forums/images/graemlins/wink.gif )

Especially in the high ranges, more pedal doesn't equate to more power. If you start bogging down you either need to down shift to a lower range or back off the pedal a little for more torque.

KiotiDave · Jan 4, 2006

Hi,
The CK series tractors use a mechanical Hydro, If you pounce on the pedal or try to accellerate too fast it will just overwhelm the relief valve and bypass the oil. The best way to use the Hydro is to keep the RPMs up and gradually increase pressure on the pedals whether forward or reverse.
Try it, you'll like it!
Don't forget that the high range is only a travel range and is purposely geared to get speed and not yield power. That is why they put the extra mid range in the 25 & 30.
Rest easy, there are no inherant problems with the Kioti Hydros.
KiotiDave

IslandTractor · Jan 4, 2006

I am confused about the suggestion that you get more torque with a HST by backing off on the "accelerator" pedal. Most diesel engines have a pretty flat torque curve. How should backing off on the "gas" end up giving you more power when climbing a hill etc. Seems counterintuitive to me.

TractorLegend · Jan 4, 2006

its a gear ratio thing---its akin to pedaling up hill in tenth gear on a bike.

Bob_Skurka · Jan 4, 2006

( I am confused about the suggestion that you get more torque with a HST by backing off on the "accelerator" pedal. Most diesel engines have a pretty flat torque curve. How should backing off on the "gas" end up giving you more power when climbing a hill etc. Seems counterintuitive to me. )

First off, you have to give up the notion that the pedal is an "accelerator" pedal. It is NOT an accelerator pedal. In fact, while technically different, you can think of the pedal more like a constantly variable transmission lever.

The CK20 has 2 RANGES. Hi and Low. Within each "range" you use the pedal to select the "virutual gear" you want to be in. Eventhough you have no "actual gears," the pedal is effectively used to select "gears" in the form of providing more or less torque. So mentally think of a slight amount of pressure on the pedal as having a maximum amount of torque, which translates into something equivalent to a low "gear" and that means you have lots of power but low speed. The farther you depress the HST pedal, the faster you go, but the less torque you have available for pulling. This is true with both RANGES.

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Now to set the record straight about the 2x4 test. It was a 2x4 laying flat so the elevation climb was only 1.5" it was not a 4x4. He did not stomp on the HST pedal. He tried it in both forward and reverse. He reported everything in a thread here.

Getut had a problem with his CK20. If a 2x4, laying flat on a hard surface (driveway) was pushed up against the tires, the tractor was not able to climb over the 1.5" thick 2x4.

There were at least 3 or 4 other people who performed the same test and had the same results. There were at least as many other people who performed the same test with no problems at all. There were a couple people who did the same test on dealership parking lots and they could not climb the 2x4. It seems to affect some units and not others.

It turns out to be something that Kioti chose to fix on a case by case basis.

cag · Jan 4, 2006

I'm the one that tried the 4x4 test, well actually 3.5''x 3.5'' the initial test was 2x4 (1.5''x 3.5'') sorry if I mislead someone...cag

Maineiac · Jan 4, 2006

As a "non HST" guy, let me ask another in a series of simpleton questions about this set-up: do you work both your left and right foot with it? In other words, is the right foot a throttle and the left foot a "go" pedal?

Thanks for helping me understand this. /forums/images/graemlins/tongue.gif

Bob_Skurka · Jan 4, 2006

You set the engine speed with a trottle lever. The engine speed stays constant.

You use the HST pedal under your right foot to control your travel speed.
Your left foot is sad, lonely and feels left out because it has nothing to do.

Maineiac · Jan 4, 2006

Bob:
Thank you. Now I have a picture of it. Is it much easier to use than the traditional (or primitive, if that's your opinion) gear drive style? I'm so used to the old set-up that I can't imagine any other. But then, I couldn't have imagined how great the internet was going to be!