OIL COOLER KIOTI DS4110

ENTOURISTE · Jul 13, 2019

I want to add an oil cooler to my KIOTI DS4110 /DS 4510 which does not have one. What must be the choice of the points of entry and exit of the oil cooler in my oil circuit?
thank you

K5lwq · Jul 13, 2019

Welcome to TBN!

I would use the return to tank line if putting a cooler in the existing circuit.

I have thought about this on my little tractor but so far the temperature is staying below 160F. I have added extra valve and remotes that do create more restriction points. Ultimately the most effective cooling would come from a low flow secondary pump in a continuous loop to the tank. This would allow the oil to be in the heat exchanger for longer periods. However, I have not figured out a good way to do a independent circuit.

Why do you feel you need a cooler? What temperatures are you seeing now?

ENTOURISTE · Jul 13, 2019

When I use the PTO for 1 hour in the summer, the temperature of the oil is over 90 ° C (200F). Result: oil smell + loss of mechanical speed (start of tightening ?!) back to normal after cooling. So I am looking for a cooling solution. (KIOTI DS4110: 200h walk without original hydraulic oil cooler)

ptsg · Jul 13, 2019

Something is not right. The oil won't get that hot unless there is some restriction somewhere.

Specially on a gear tractor. Make sure you don't have the remotes engaged on a detent position.

K5lwq · Jul 13, 2019

Yes, something is not right! A cooler is not going to solve the issue. Did you buy the tractor new? Was there a time this did not happen? Is it by chance under warranty?

ENTOURISTE · Jul 15, 2019

Yes the tractor was bought new in 2015.The first years with original oil no problem, with same gyrobroyeur usited. The problem appeared in 2018 after the overhaul of the 130H.the dealer checked on his bench he says it's OK.However the hydraulic oil he changed is of characteristic : viscosity 88.75 / 40 ° C and 13.4 / 100 ° C so it is thicker I think the hydraulic oil KIOTI 57.5 and 9.35. My gyrobroyeur
1.50metre width rotary grinder requires a maximum power of 22kW - the PTO supplied a maximum power of 25.3kW / 540Tmn manufacturer. Maybe this oil would be too thick, would skate the PTO multi-plate clutch and raise the oil temperature?

K5lwq · Jul 15, 2019

Yes, running a thicker oil will increase friction generating more heat. However, not sure it rise to level you are seeing.

I am more interested in how the loader is plumbed. Does it have power beyond? 6 or 7 hoses off the valve? Does the loader seem weaker?

ENTOURISTE · Jul 16, 2019

I do not have a charger before.Seul rear lift.

K5lwq · Jul 16, 2019

I am not seeing a reason for the high temperatures. So I would start with it cool and take temperature reading before and after each restriction point to determine where the rise is occurring. There could be a partial blockage somewhere that is causing this issue.

If I could not find a issue, I would go back to manufacture specifications for hydraulic oil and see if temperature lowers to proper range.

I am not sure why the dealer wanted to go to a thicker oil and not sure of what was rebuilt and bench tested. But that change seems related to these symptoms.

Let us know what you find out and hopefully it is a simple solution. Good luck.

ptsg · Jul 16, 2019

Those Kioti tractors do have a hydraulic block would provide the flow for a loader if you had one. This block has a spool with a slot in it to be turned with a flat screwdriver.

If you turn it one way, the flow goes from the pump to the remotes and then 3 pt hitch. If you turn it the other way, it will go from the pump, to the loader valve and then to the remotes and 3 pt hitch. Since you don't have a loader installed, those ports are capped off.

I'm wondering if the spool on this block somehow moved and it's halfway from the position where it should be. Which would cause the restriction and heat since the flow is trying to go into a blocked way.

Hopefully I'm explaining this in a understandable way.