multi power
Member
- Location
- pembrokeshire
i used to drive a 3140, it was no use for tipping heavy trailers, steering was no problem while tipping
open and closed centre hydrualics
- Thread starter clod h
- Start date
i used to drive a 3140, it was no use for tipping heavy trailers, steering was no problem while tipping
Cowabunga
Member
- Location
- Ceredigion,Wales
Steering would take priority. The tipping would slow down very noticeably while you steered though.
multi power
Member
- Location
- pembrokeshire
correct, tipping was very slow at the best of times
- Location
- Ashbourne, Derbyshire
Can someone explain this to me please,
Taken delivery of a new sprayer last week, on reading the book it says that it needs to be altered to match the tractor whether it's CC or OC.
The tractor it's going on is CCLS, but the sprayer only has a feed and return line for the hydraulics, no LS line, and requires the tractor to be constant pumping.
So in my mind that makes the sprayer OC? or have i got this wrong?
Taken delivery of a new sprayer last week, on reading the book it says that it needs to be altered to match the tractor whether it's CC or OC.
The tractor it's going on is CCLS, but the sprayer only has a feed and return line for the hydraulics, no LS line, and requires the tractor to be constant pumping.
So in my mind that makes the sprayer OC? or have i got this wrong?
Roy Stokes
Member
- Location
- East Shropshire
I think, if it is the same as our Knight trailed sprayer you need to alter the system for older JD tractors but for CCLS tractors treat it as open centre, we run ours on a Massey as open centre without problems, I do however tune the tractor valve right down so I can leave it pumping along the road without loosing engine power
multi power
Member
- Location
- pembrokeshire
Masseys where u have to change over between linkage n spools were last made long before you were born
clbarclay
Member
- Location
- Worcestershire
Most of the tractors I've used were made before I was born.
sc4545
Member
- Location
- kinnegad ireland
sorry for dragging this back up but you guys might be able to help.
I have a simple PTO driven gear pump on one of the tractors we used to wrap with. we are now wrapping using LS on another tractor. is it possible to convert my PTO pump to an LS type system as used on some of the NH and Deutz tractors? the only reason I ask is if I need to put this back on the wrapper I have to convert the wrapper back to OC. is it possible or am I mad to be thinking about even trying to do it.
I have a simple PTO driven gear pump on one of the tractors we used to wrap with. we are now wrapping using LS on another tractor. is it possible to convert my PTO pump to an LS type system as used on some of the NH and Deutz tractors? the only reason I ask is if I need to put this back on the wrapper I have to convert the wrapper back to OC. is it possible or am I mad to be thinking about even trying to do it.
Cowabunga
Member
- Location
- Ceredigion,Wales
In a nutshell, no. Not practical.
teephart
Member
Why?
But that's not closed centre load sensing hydraulics.
Kevm
Member
- Location
- Aberdeenshire
That's not the closed loop circuit that this thread is about, that is a hydrostatic circuit.
Well worth a thread resurrection to read the first 2 pages....... 
Cowabunga
Member
- Location
- Ceredigion,Wales
Because you just cannot convert an open centre fixed displacement gear pump into a controlled flow closed centre unit. The circuit can be modified to work with closed centre spools using some fancy priority valving and much plumbing but it just isn't practical, especially, I surmise, using a PTO driven gear pump, whether a factory fitted one or an externally mounted unit run off the six spline PTO that usually drives implements.
Cowabunga
Member
- Location
- Ceredigion,Wales
No that is not a hydrostatic circuit as far as I can see. It works a double acting ram in the circuit. However, closed centre systems need not be closed circuits and on tractors are generally not. Returns from consumers like valves and motors on closed centre farm tractors mostly return to the sump, which is usually, but not always, the gearbox reservoir. In some cases it is a separate reservoir mounted externally. The returns from the spools or motors return under low or zero pressure to the reservoir not directly back to the circuit as in the video.
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I'm fully aware that it is impossible to convert a gear pump into a load sensing pump. If the spool valve can be used for both open centre and LS then it's worth seeing if a LS hyd pump can be fitted to the pro gear box. If not replacing all the major components will probably make it an unecomical conversion.
How about sticking an electric full flow dump valve onto the PTO pump delivery line, and use a pressure solenoid in the wrapper load sensing line to control the dump valve flow?
sc4545
Member
- Location
- kinnegad ireland
how do the likes of new holland manage it with the T6010s using a fixed gear pump and plumb the loader valve up using an LS valve? I suppose laziness is the major driving factor in this! if I fitted a PFC pump complete with compensator could I simply plumb into the compensator line and use that as the Ls Line??