Closed or open center diverter?

[exmoor dave]

I'd like to fit a manual 3 way 6 port diverter on one of the tractors so that I can keep both the hitch and the hydraulic top link plugged in to one spool, leaving the other free for what ever implement is on.

Found the diverter I want on ebay, but there's the option of open or closed centers?

I've always wondered what the difference is and what type of center should be used in what scenario?


Tractor is jd5720

Cheers

 

[Henarar]

I'd like to fit a manual 3 way 6 port diverter on one of the tractors so that I can keep both the hitch and the hydraulic top link plugged in to one spool, leaving the other free for what ever implement is on.

Found the diverter I want on ebay, but there's the option of open or closed centers?

I've always wondered what the difference is and what type of center should be used in what scenario?


Tractor is jd5720

Cheers

Would have thought it would depend on what the tractor is ?

 

[devonshire farmer]

All the 6000 range were closed centre as are many others not sure about your model though but it just means the pump runs all the time rather than on demand resulting in better oil flow as I understand it, better for driving hydraulic motors!

 

[kill]

My guess is open centre after the spool valves/loader valve chest as they will have already sorted the hydraulics out internally.
A quick phone call to Ross at Mason- Kings Exbridge would clarify everything fully as he's a fantastic source of John Deere knowledge

 

[devonshire farmer]

I need to put the hitch slide on a manual tap on our 6400 getting sick of plugging and unplugging as only have the 2 spools, what's easiest way to do it from rubber spool pipes being plugged in please?

 

[kill]

I need to put the hitch slide on a manual tap on our 6400 getting sick of plugging and unplugging as only have the 2 spools, what's easiest way to do it from rubber spool pipes being plugged in please?

Leccy divertor off eBay or phone @NYTP for a quote for a 3rd service kit but my guess that's going be atleast 5x dearer but won't need any pipe work done.

 

[devonshire farmer]

Leccy divertor off eBay or phone @NYTP for a quote for a 3rd service kit but my guess that's going be atleast 5x dearer but won't need any pipe work done.

Thanks so how does the leccy diverter work any chance you could send me a link to the item on eBay please?

 

[kill]

Thanks so how does the leccy diverter work any chance you could send me a link to the item on eBay please?

I cannot do links but search " 3/8 6 port hydraulic divertor " it's the same as a loader third service and £87 and also available with 1/2 inch ports. Dereck Lane at Tedburn St Mary may do a good deal or a good vapourmatic stockist. Also need a switch to activate and an leccy supply but very basic stuff and plumbing is same as a loader as 2x ports for feed and 2x ports to hitch and 2x for 1/2 quick couplers for externals

 

[exmoor dave]

My guess is open centre after the spool valves/loader valve chest as they will have already sorted the hydraulics out internally.
A quick phone call to Ross at Mason- Kings Exbridge would clarify everything fully as he's a fantastic source of John Deere knowledge

Haha! The tractor is in Ross's hands anyway cause it's poorly!

 

[exmoor dave]

Thanks so how does the leccy diverter work any chance you could send me a link to the item on eBay please?

I managed to bodge one on to a mf875 loader on a mf362 we once had to give it a 3rd service........ so it can't be too hard

The adapter plate to fit much heavier Chilton attachments on was prehaps in high sight not the best idea.........loader ended up snapped in half

 

[Mursal]

If you watch this out in UTube (button bottom right) loads of other stuff
...........

 

[Henarar]

why would a diverter valve need to be any different for closed centre hydraulics ?
as long as you were not using it to run something with its own spool valves I cant see it would make any odds, you have to be careful running spool valves set up for open centre hydraulics with a closed centre pump as the pump will run all the time as it senses a demand and the oil and pump will get hot and wear the pump out quicker than it should, if you are just operating rams as in hydraulic top link or hitch ram I can't it makes any odds what pump/hydraulic system the tractor has

 

[Henarar]

@exmoor dave
If you pull one of the spool valves with nothing attached does it make the pump work hard ?

 

[milkloss]

If you watch this out in UTube (button bottom right) loads of other stuff
...........

What it doesn't go on to explain is how the swash plate is controlled in a working situation such as a tractor. I presume the load sensing line does this by a lowering of pressure that allows the plate to move for higher flow?

 

[exmoor dave]

@exmoor dave
If you pull one of the spool valves with nothing attached does it make the pump work hard ?

Off the top of my head, yes it makes the pump work.

Tractors at dealers at the mo though so I can't test it

 

[Mursal]

The tractor has load sensing (closed center) according to TractorData click

why would a diverter valve need to be any different for closed centre hydraulics ?
as long as you were not using it to run something with its own spool valves I cant see it would make any odds, you have to be careful running spool valves set up for open centre hydraulics with a closed centre pump as the pump will run all the time as it senses a demand and the oil and pump will get hot and wear the pump out quicker than it should, if you are just operating rams as in hydraulic top link or hitch ram I can't it makes any odds what pump/hydraulic system the tractor has

..........................

But the diverter valve is a 3 way valve, so for this application I'm guessing:
position 1: Toplink
position 2: OFF
position 3: Hitch
Because of the OFF position, that's why the question was asked do you want open or closed.

Consider going for a 2 way valve like on the front of the loader, something like these click, with no OFF position. Then you can use open center.
position 1: toplink
position 2: Hitch

...............

 

[Mursal]

What it doesn't go on to explain is how the swash plate is controlled in a working situation such as a tractor. I presume the load sensing line does this by a lowering of pressure that allows the plate to move for higher flow?

Yes, if no load sensing line is fitted, it senses a drop in supply pressure when a valve is opened by the driver.

 

[Henarar]

Off the top of my head, yes it makes the pump work.

Tractors at dealers at the mo though so I can't test it

sounds like open centre then

 

[Pheasant Surprise]

I'd like to fit a manual 3 way 6 port diverter on one of the tractors so that I can keep both the hitch and the hydraulic top link plugged in to one spool, leaving the other free for what ever implement is on.

Found the diverter I want on ebay, but there's the option of open or closed centers?

I've always wondered what the difference is and what type of center should be used in what scenario?


Tractor is jd5720

Cheers

Have you got a link to the particular diverter valve?

Tend to agree that open/closed centre is a red herring as your plugging into an existing spool valve - and your just diverting its flow between one of two consumers. Therefore there is no "closed" position as @Mursal says it's set in either "A" consumer or "B" consumer position. There should be no third position.

The tractor spool controls the flow as normal (hence its centre type is important, not that you need to worry) not the diverter.

Closed or open centre would only be relevant if you were plumbing it directly into the hydraulics - like a power beyond port. But then you're effectively making your own spools....capisco?

 

[exmoor dave]

http://www.ebay.co.uk/itm/Flowfit-6...d=251536250058&_trksid=p2047675.c100005.m1851