westerberg
New member
I need to know whether my tractor's hydraulic system is open centered or close centered.
I have a Kioti CK35.
I have a Kioti CK35.
what is my tractor's hydraulic circuit type ?
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MtnViewRanch
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open center
OP
westerberg
New member
thanks
where did you find this, or did you already know?
As for OP this is a useful site for most things but for you particular model it doesn't tell me if it is open or closed
TractorData.com Kioti CK35 tractor information
Cheers Ed
J_J
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You can usually tell open from closed by installing a hyd gage in the flow path before the first valve.
In neutral, open center will have low or no pressure as the p[ump fluid is flowing through all valves in series.
Closed center will usually show a standby pressure until a valve is activated. The pump bypasses the fluid to tank until needed.
Closed center valves are parallel connected.
In neutral, open center will have low or no pressure as the p[ump fluid is flowing through all valves in series.
Closed center will usually show a standby pressure until a valve is activated. The pump bypasses the fluid to tank until needed.
Closed center valves are parallel connected.
Tx Jim
New Member
J_J
Your statement about CC hyd bypassing fluid to tank until needed is incorrect. On a CC system the pump stops pumping oil when stand-by pressure is attained.
J_J
Super Star Member
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This is my understanding of the CCLS.
A variable volume
piston pump, that has a compensator
that will allow the pump to standby at
low pressure (xxx PSI) when the
system is not being actuated. It will
sense the flow requirements of the
system when it is being actuated and
provide a variable flow rate as the flow
demands of the hydraulic system are
varied.
From 0 flow to whatever.
In a perfect hyd system, there might 0 leakage, but we know better. So the pump will be intermittently working to keep the system at a specific pressure.
A CC valve will leak the same as a Open center valve so the flow will vary.
So, do you think a worn valve will allow the pump to run more than when new?
Is there always a separate pump for steering?
A variable volume
piston pump, that has a compensator
that will allow the pump to standby at
low pressure (xxx PSI) when the
system is not being actuated. It will
sense the flow requirements of the
system when it is being actuated and
provide a variable flow rate as the flow
demands of the hydraulic system are
varied.
From 0 flow to whatever.
In a perfect hyd system, there might 0 leakage, but we know better. So the pump will be intermittently working to keep the system at a specific pressure.
A CC valve will leak the same as a Open center valve so the flow will vary.
So, do you think a worn valve will allow the pump to run more than when new?
Is there always a separate pump for steering?
Tx Jim
New Member
There's a lot of differences in a CC & CCLS system. JD's CC system on tractors from '61-'92 if operating correctly are never much below 2250 psi. JD CC system has no tiny load sensing line such as a CCLS system. JD CC has no separate power steering pump. Some closed center control valves don't leak. The 3 pt hitch on my 4255 with nearly 11,000 hours on hr meter will stay in the raised position for months at a time without R-O-D screw closed.