Grapple hyd plumbing

[Mt406]

I am adding a log grapple to my old atlas knuck boom.
So I am replumbing some of the hydraulics.
My question is can it install a valve in the return line next to the valve body?
I don't have the funds to replace the valve body at this time.
Any info is appreciated 
Thanks 
Scott 

[snowstorm]

No. You will need 2 valve sections. 1 to rotate 1 to open close. And the longer bolts to hold the valve bank together. Along with o rings to seal the new valves to each other

[mike_belben]

There are a few options.  If you have a sectional valve, what snowstorm is saying is the best way.. To add a section for the additional A/B port you need,  and get new allthreads to accomodate the new section thickness. 

If you have a monoblock, that is out but there are a few other ways to do it.  I will save myself some typing and wait for you to tell us what your current valve is.  Or even better, post a pic. 

[Mt406]

It is a sectional body it is no longer available. It leaks around the spools.
It will have to be replaced.
I am not using a rotator on grapple.
Trying to make this work with out spending a lot and revaluate this winter.
 I've been offered a salvage logging project not sure how profitable it will be. So I don't wanna spend a lot of money getting  started.

[kiko]

Tee the outriggers to run on one section and use the other section for the grapple.

[mike_belben]

Hyd fluid is cheap enough to let an occasional use machine leak.  

Im with kiko.  Put a 2 port 2 position selector valve down stream of the outrigger spool.  You got 2 outriggers so two selectors and lines will cover a rotator and a grapple.  

https://www.surpluscenter.com/Brands/Prince-Mfg/1-2-NPT-20-GPM-Double-Selector-Valve-9-4128.axd

[kiko]

Diverter valves yes.

[Fergy]

Hyd fluid is cheap enough to let an occasional use machine leak.  

Im with kiko.  Put a 2 port 2 position selector valve down stream of the outrigger spool.  You got 2 outriggers so two selectors and lines will cover a rotator and a grapple.  

https://www.surpluscenter.com/Brands/Prince-Mfg/1-2-NPT-20-GPM-Double-Selector-Valve-9-4128.axd

Mike do you Americans refer to these as 2 port valves? In Australia we refer to then as 6 port valves and then use some kind of backwards fractional measurement that seems to have no direct relation to the port size to indicate the port sizing 🤷‍♀️ 

[Mt406]

That's a good idea to use a diverter valve .
I wouldn't have thought of that.
That solves one problem. Thanks 
Now the rest of the story 😁
The pump in the trunk is tired it's a double pump system. It was added later not sure what was used on the end of boom.
No tags on pump casting numbers come up with nothing on internet.
Made many calls to dealers no help.
Surplus Center can match a pump to the PTO th question is how many gpm.
Its not a high flow system the hoses are 3/8 and 1/2.
Thanks 
Scott 

[Fergy]

With a knuckle boom pressure is probably just as important as flow 

[Mt406]

They are 2 braid hose so I am thinking 2500-2800 psi 

Scott 

[snowstorm]

Most old loaders ran at 2100 psi. With no rotator you a going learn to hate it real fast. Usually it's best to spend a little extra and have things right. That way your working with it not on it. If it has a tanden pump to run the crane it will have a mid section in the valve bank

[mike_belben]

Hyd fluid is cheap enough to let an occasional use machine leak.  

Im with kiko.  Put a 2 port 2 position selector valve down stream of the outrigger spool.  You got 2 outriggers so two selectors and lines will cover a rotator and a grapple.  

1/2" NPT 20 GPM Double Selector Valve | Prince Mfg | Brands | www.surpluscenter.com

Mike do you Americans refer to these as 2 port valves? In Australia we refer to then as 6 port valves and then use some kind of backwards fractional measurement that seems to have no direct relation to the port size to indicate the port sizing 🤷‍♀️

I cant speak for anyone but me.  Those valves i linked have a single spool with 2 positions and 2 ports per spool.  Yes that makes 6 total because of its tee configuration.  So its taking the A/B work ports coming out of his loader valve, plumbing those into the selector valve inlet pair. Then the output routes A/B to one cylinder, lets call it the left, or the other, call that the right.  

The fractional system.. Is it -4, -8 and so forth?  Our hydraulic conduits are rated in sixteenths of an inch.  16 sixteenths = 16/16 = 1 inch.  So a dash 16 fitting is an inch.  Dash 4 is 4/16 or 1/4".  Dash 5 is an oddball that only john deere mowers used.. 5/16s. Dash 8 is a half inch and so on.