Hi Pitched squeal, no forward or back problem CK20--advice sought.

[MichiganIron]

The DK series HST uses the tractor hydraulic pump for the charge pressure. The CK20 HST has a charge pump in at the front of the HST. The 2 are different.

The CK20 TEST PORTS are on the top of the HST case. The TEST PORTS are readily accessible on the top of the case. The valves are located on the side of the HST. These are not as easy to access as the test ports, but can be done without completely splitting the tractor. The center port is the charge pump test port (77-99psi). The 2 on either side is the forward and reverse test ports. The HST should run at about 3980psi.

The HST is a closed loop hydraulic drive with a variable displacement pump running a fixed displacement hydraulic motor. Since it is a closed loop system, their are losses in the system, for example heat. The purpose of the charge pump is to continuously provide a low pressure source of fluid to the system to compensate for the losses.

Hope this helps.

 

[kattywumpus]

The DK series HST uses the tractor hydraulic pump for the charge pressure. The CK20 HST has a charge pump in at the front of the HST. The 2 are different.

The CK20 TEST PORTS are on the top of the HST case. The TEST PORTS are readily accessible on the top of the case. The valves are located on the side of the HST. These are not as easy to access as the test ports, but can be done without completely splitting the tractor. The center port is the charge pump test port (77-99psi). The 2 on either side is the forward and reverse test ports. The HST should run at about 3980psi.

The HST is a closed loop hydraulic drive with a variable displacement pump running a fixed displacement hydraulic motor. Since it is a closed loop system, their are losses in the system, for example heat. The purpose of the charge pump is to continuously provide a low pressure source of fluid to the system to compensate for the losses.

Hope this helps.

On the CK series does the HST and tractor hydraulics share the same fluid reservoir? I know the DK series does.

 

[MichiganIron]

Yep, the same transmission reservoir is used for both...but...the HST fluid circuit in both the CK and DK Tractors has a separate filter and oil cooler. We have seen overheated hydraulic systems in HST Tractors where the HST unit was completely protected by the cooler circuit.

Another good reason to use the proper hydraulic fluid in these tractors. The fluid needs to be able to properly lubricate AND act as the power transmission fluid in the HST. Stay away from the cheap stuff not designed to do both.

 

[kattywumpus]

Yep, I understand HST and tractor hydraulic have separate feed circuits. I did not know the CKs had a separate precharge pump for the HST. I got the impression from the Kioti engineer that the relief and neutral valves were difficult to access, but you have a good point about the test ports. I didn't think of that. You learn something new everyday.

 

[CBB]

Michigan Iron,

Thanks for the information. Maybe it will not be as major as some folks with CK20's have encountered--needing to replace the whole unit. Time to get it to the dealer and find out. I will report back.

 

[CBB]

Tractor is in the shop. Right on, no charge. Going to split the engine to service it. Estimate is 750-800. It is 6 months out of warranty and I guess Kioti goes by the exact date for coverage on the 4 year warranty. I just hope they don't find it is the whole HST, which would be several thousand.

 

[Littlejohn10]

My CK-20 HST locked up, the engine cut off and I couldn't move the tractor. Used a floor jack to lift the front axle and found the front wheels would turn in obsite direction through the diferential but would not turn in the same direction.
Removed the front axle drive shaft and found the penion shaft bearing had failed and jamed the ring gear. There was some noise generated by this problem but I couldn't trace it. Proper oil level not an issue.