First try of the new setup and I blew the side out of my valve, I am not sure if I had something plumbed wrong. I see the valve has an internal pressure relief for both outlets but maybe if I had the suck and pressure side plumbed back wards the relief would not work. The bottom of the valve had 3 ports, one in, one out and the mystery port which I plugged. Anyways I have seen these setups before, sometimes rear mounted, needless to say I need another. If you have one let me know.

First off those brass ball valves are not for hydraulic service. I am assuming you are using them to block off the lines running to the dozer circuit?

Those brass valves are typically rated for 300 PSI, while the hydraulic system is running at a minimum of 800 - 1000 psi.

Another issue I see is the placement of the filter. Typically the filter is placed between the valve reservoir on the low pressure return line, it appears that it is located on the pump suction line which can lead to cavation and seal failure.

I am thinking that the line you plugged might be the relief valve return port on the unit.

I think you will have some time trying to track that style of control valve mounted on the bottom of the unit, unless someone has one hidden away that still has good spools and body.



Here are some valves rated for hydraulic service.

www.surpluscenter.com/item.asp?UID=20080...12&catname=hydraulic

www.surpluscenter.com/item.asp?UID=20080...12&catname=hydraulic

Its a good thing no one got hurt, if someone was in the seat they could have gotten a thigh or forearm full of brass and hyd fluid.
From what I understand about hydraulics there has to be a circuit; you can't just 'turn off' a section of it. Especially with a grossly underrated valve.

The pump is always pumping, even if you are not using it. If you 'stop' the oil it will pressurize until something fails or it stalls the engine. The oil has to circulate thru a return when the control valve in in the hold position.

Altho, I can't really see how you have it plumbed...

CS