I recently borrowed my fathers ck20s tractor which has be faithful in our family for 12 years, he had been using it to haul logs out of the woods and it was working fine. We hauled to to my home to do some driveway and drainage work with the BH attachment. It worked fine for 4 days until I dug a 4 ft deep hole and maxed out the main boom and it wouldn’t lift back up. The secondary would extend fine, with bucket rotation and swing movement working fine. At the same time the FEL main hydraulic wouldn’t lift but the bucket would curl. The tractor drives fine as if nothing is wrong. Currently I can get the bucket off the ground about a foot before it stops moving and have locked the BH in the up position to be able to live it around. I’ve taken apart the double acting valve see link (https://www.michiganironandequip.co...ption)/01-01|~CK20-M-Hydraulic/0101CK200153/y) because my father had issues with this previously due to water getting in and freezing but had fixed it and was working fine. I’m kind of stumped here and looking for directions on where to go next. Thanks!
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Kioti CK20S hydraulic issue
- Thread starter Batesguy
- Start date
I'm no authority on Kioti tractors (in fact I try to steer clear of them) but that actually sounds like two separate problems. I would think the backhoe attachment has its own valve stack to operate the various functions, and they would be totally unrelated to loader lift/curl functions. Maybe I'm wrong on that. The backhoe boom problem. I'm not sure what "maxed out the main boom" means. The boom cylinder was fully extended and would not retract? If that's the case, how did you get it back into transport? Using the bucket and the other cylinder to push it back into place? If so the boom cylinder in question SHOULD have resisted that action unless the trapped oil in the barrel was released. If you were able to raise the boom by other means without releasing that pressure it means the piston has a problem. The seals are suddenly totally gone, the piston is broken or has come off the rod. I think you need to pursue that as a cylinder problem.
The other problem with the loader. It works off the tractor remote valves? You suspect one of those to have a problem? Have you tried just switching functions from one valve to the other to see what effect that has?
The other problem with the loader. It works off the tractor remote valves? You suspect one of those to have a problem? Have you tried just switching functions from one valve to the other to see what effect that has?
So you are correct the cylinder was at max extension and would not come back out of it. When the main boom on the BH attachment would not come back up I had to get my cherry picker (2 ton mobile crane) to pick it back up while holding the joystick to allow fluid to flow back through the system. I had to do this for the stabilizers as well. Today I changed the hydraulic fluid (no metal shavings found) and I checked my pressure relief valve spring and everything seemed fine. I have yet to do a pressure test but it seems like it should be fine since my problem is intermittent and slow function.
If you had to relieve pressure in the cylinder to allow the rod to retract, then the piston should be okay. Set that idea aside for now. I'm curious about what would happen if you had started it back up with the cylinder part way up and tried it again. Would it have done the same thing all over or would it work as it should as long as the rod wasn't fully extended?
So I actually immediately tried that thinking it was a “one off” and maybe I was low on fluid or something, so after I checked fluid and everything was fine I dropped it back in the hole and it wouldn’t come back up. This was when I realized something was wrong and I needed to park it. Once I got it back up and locked I went to pickup the front and that’s when I realized I was in deep with this. Luckily it did pick up enough to get it in the shop but I had to sit there messing with the FEL joystick for awhile to get it up a foot to drive.
I can't see what you have for hydraulic plumbing or how things are connected to the tractor system (assuming it is, and not a PTO pump?) so I hesitate to say what is or isn't right. If you can operate some of the functions, but not when demanding power above a certain point, then pump pressure comes into question. Maybe start with a gauge plugged in somewhere to get an idea what that pressure is?
The tractor does have a PTO and it works flawlessly but the BH runs off hydraulic pressure, I’ve checked my connections for both BH & FEL and everything seems fine. I almost think it’s dumping fluid like a spring has broken but I checked the pressure relief spring and it’s fine (assuming it only has 1 for the entire system) or there’s a blockage somewhere but I’m not sure where it would be. If the pump was gone wouldn’t I see shavings in the fluid when I changed that today? I know it is pumping something because I had the fill tube off and started it with the rubber return hose (from some other part of the hydraulics that connects to the fill tube) and it was flowing steady. I guess a question i have is, if the pump was shot would the HST not work? Because it drives fine
I do agree the next step is a pressure test so I will get a pressure test underway and get back to you on the results.I can't see what you have for hydraulic plumbing or how things are connected to the tractor system (assuming it is, and not a PTO pump?) so I hesitate to say what is or isn't right. If you can operate some of the functions, but not when demanding power above a certain point, then pump pressure comes into question. Maybe start with a gauge plugged in somewhere to get an idea what that pressure is?
The transmission most likely has a separate charge system, usually the return from the steering goes through a charge filter then into the hydrostat. At least most systems I'm aware of operate that way. I could look up the parts diagrams on this mode and prove that one way or the other, but it's safe to say the two are only marginally related.
I referenced the diagrams used to increase system pressure to find my pressure relief valve spring just to ensure I was looking at the correct spring and what I pulled out was fully intact. So that shouldn’t be necessary. If the component I linked in my original post wasn’t fully functional and something was wrong would this cause issues that I’m describing?