To the admins - if this is out of line or inappropriate please delete it.
I am starting this thread to give folks a chance to learn the basics of Kubota tractor hydraulics. Its the number one topic here and multiple people have asked for something of this sort. Its an open discussion. Feel free to ask questions and provide answers. If you are providing answers make sure you are speaking fact not fiction. Public flogging of purveyors of missinformation is encouraged and that includes me!!
I am going to start things off with something simple. Here is a diagram of an open center circuit similar to the loader and third function on a Kubota tractor. Its the source of much confusion. Ask a question and I or someone ekse will try to answer it. One question at a time and keep the question short and specific.
I will start by telling you that the pump produces a constant flow of oil which must always have a way to circulate. If it does not the pump is deadheaded and catastrophic damage is immediate.
Keeping that in mind, with ALL valves in neutral ALL oil flows continuously around the outer circle. Red is called the neutral circuit and blue is called the tank circuit. Please be precise when using those terms.
In this state pressure in both the neutral and tank circuits is "zero"
Now let the discussion begin!!
Dan
I am starting this thread to give folks a chance to learn the basics of Kubota tractor hydraulics. Its the number one topic here and multiple people have asked for something of this sort. Its an open discussion. Feel free to ask questions and provide answers. If you are providing answers make sure you are speaking fact not fiction. Public flogging of purveyors of missinformation is encouraged and that includes me!!
Please keep questions and answers short
I am going to start things off with something simple. Here is a diagram of an open center circuit similar to the loader and third function on a Kubota tractor. Its the source of much confusion. Ask a question and I or someone ekse will try to answer it. One question at a time and keep the question short and specific.
I will start by telling you that the pump produces a constant flow of oil which must always have a way to circulate. If it does not the pump is deadheaded and catastrophic damage is immediate.
Keeping that in mind, with ALL valves in neutral ALL oil flows continuously around the outer circle. Red is called the neutral circuit and blue is called the tank circuit. Please be precise when using those terms.
In this state pressure in both the neutral and tank circuits is "zero"
Now let the discussion begin!!
Dan
Last edited:
