Dearborn 19-23/Parker Hyd. Valve

[Suz]

Hi all,
Here I am the "New Kid" on the block and am already asking for help so don't come down on me too hard!!
Is there anyone out there who has any information on the care and feeding of a old Parker 8743 hydraulic control valve that is on the Dearborn 19-23 FEL? (I contacted Parker Hydraulics and no help there.)
I was having problems with my loader not lifting and I think the problem lies with the control valve. The loader worked fine until one day it wouldn't even lift. If the arms would raise they would go very slowly and then if you would pull the handle again, the bucket would drop.
So, I took apart the control looking for some obstruction in the spools. (First mistake.) After putting the control back on the loader and doing the plumbing nothing changed.
Next step was to check out the relief valve. (Second mistake.) When I turned out the relief valve I had pieces flying out of the control and landing in my drip bucket from the spring pressure. I think I lost some of the pieces and I cannot figure out the sequence of the parts and if indeed there is a small metal ball missing. (Third mistake)
Years ago when I bought the loader from a farmer he couldn't make it lift and it acted just like now. After talking to a Ford Dealer in the area we determined there was a steel ball missing from the relief valve and he had one in stock for 50 cents.
Only now I don't know the part number, size, or anything about that steel ball. Also I don't remember the position of the parts in the relief valve.
BTW, the loader works now but there is a definite "growl" in the system which makes me think the relief valve is leaking even if I have the adjustment screw turned in all the way.
So, is there anyone out there who has a exploded view or a picture of the relief valve, or has any information that can be shared on the rebuild and adjustment of the control I'd appreciate hearing from you.
Thanks in advance!

 

[J_J]

The relief section of the valve, should have something this, Retainer, adjusting pin, spring, shim, ball in that order. Sometimes the shim is before the spring. Turn pin/screw counter for less pressure and clockwise for more relief pressure.

Unless yours is a set pressure relief .

There are slight differences in arrangement of the relief components, The PDF shows one way.

http://hydraulics.eaton.com/products/pdfs/i3677s.pdf

 

[kennyd]

Sounds to me like the load checks in the valve where going bad...and now you have parts for the relief missing...

I would suggest a new valve...and a gauge to set the relief valve properly. A new joystick valve is $200, I can link one if you are interested.

 

[Suz]

Thanks JJ for the link, but Ed and I have been in communication for several days with him sending me personal emails with the manuals attached. But, none of the manuals show the care and feeding of the old control unit.
I called Parker Valve and the fellow I talked to couldn't find any info on this old valve, but he told me that there was a co-worker who had worked there "forever" and he might know of some manuals. But, he was going to be off work until Monday.
If I ever find the answers I will be sure to post my findings for all to read.

 

[Suz]

Sounds to me like the load checks in the valve where going bad...and now you have parts for the relief missing...

I would suggest a new valve...and a gauge to set the relief valve properly. A new joystick valve is $200, I can link one if you are interested.

I really would like to keep the same valve for several reasons. One I'm cheap and second I'd like to keep the valve because I don't want to go through all the additional "plumbing" and mounting issues.
But, I will consider the option of putting on a new control if I cannot get this one fixed.
Thanks,