2022 CK3510SE HST transmission issue

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kdancy

New member
First time posting. While working (using grapple and rear scrape blade) my CK3510se HST with 250 hours, all of the sudden the tractor would not move in any gear, only make a slight grinding noise like it was trying to go into gear but would not. Checked all the shift linkage and installed one 6mm roll pin in linkage as this pin had fallen out right after I bought the tractor. Everything good and tight. No difference, sounded like it was coming from inside the case. Wound up winching it onto my car trailer and taking it to my Kioti dealer. Mechanic listened as I cranked it up (noise started as soon as it was running), checked the shift linkage and said "I know exactly what's wrong, had another one 3 weeks ago and it was the "drive plate". This is an HST so it doesn't have a splined clutch plate like a standard trans would have. So I left it to get fixed (two to three weeks). I am trying to find exactly what a stripped "drive plate" is on an HST as I figure it is a splined gadget that bolts up to the flywheel and has splines that an input shaft on the HST has for power transfer from the engine to trans. I'm guessing that the splines are stripped, thus the grinding sound and no tractor movement in gear.
Looking online and in the maintenance manual, I can only find what is termed a "damper", that bolts to the flywheel and looks like the HST input shaft goes into.
Am I barking up the wrong tree?
 
Actually, that is a relatively common practice, and has been for years. Many machines (tractors included) that have hydrostatic drive or power shuttle transmissions don't always have a dry clutch, pressure plate, throw out bearing, ETC. They simply use a plate of some sort bolted to the flywheel with a splined hub and a matching shaft that's part of the transmission. Nothing unusual about the concept. The only real difference here is the quality. Most of them, no matter what brand, last for years and/or thousands of hours before something gives up. What you're experiencing is another example of Kore engineering in action. Something in the design or manufacturing quality control was missed.
 
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