proper hydraulic.......follow-up

Thank you to all who responded to my post. I got great info from you guys and i feel like I have a better handle on designing a simple hydraulic circut, although I still have a lot to learn before I start adding hoses.

Here is the first thing for me to tackle, I need your help again. The attached picture is the vavle on my FEL on my 8N. The pump is on the front of the tractor. The problem I'm having is exactly one on the issues we disscused. The valve is controlling a single-acting cylinder. Power up, gravity down. When I engague the valve to let the FEL down I get engine loading. Is there an adjustment I can make to this valve to stop this? What is the screw on the valve for? Is the hose going to the cylinder connected to the wrong port? The bottom of the valve says " Char-Lynn " and the model # ,best I can tell anyway, is 1500. Thanks again. -dave

Looks suspiciously like a valve for a double acting cylinder with that pipe plug just above the cylinder hose. And when lowering that means the pump sees a blocked line and that will load the engine. You could remove that plug and pipe that to the oil return line to relieve the load. I have no idea what the screw might do. Its possible it does what you need, its possible it holds parts together.

Gerald J.

I'd replace everything that can ever have pressure in it that is not hydraulic hose or hydraulic fittings. I KNOW 8N were often plumbed with plain old water pipe. I had one plumbed that way. I have a MF loader that had 125 PSI street elbows on the cylinder ports of the valve (saved 6" on the length of each hose)

I've seen black iron elbows fail at 75 PSI water or 12 inches natural gas pressure. Probably from the forces of the tapered threads. I won't ride any where near any with 1500 or more psi hydraulic oil.

Gerald J.

The make hydraulic hose and fittings for a reason!

What you want to do is possible.

But there are _so_ many variables. Sometimes the screw is an adjustable pressure relief under it, sometimes it is a flow valve that converts between regular & power beyond, sometimes it is just a cap for a way for them to insert parts inside the valve.....

Maybe someone reading here has experience with your valve, but an expert with a manual & parts description would really help you _know_ what you have without guessing.

Galvanized water elbows are not right for modern 2000lb pressure systems. I may have used one or 2 in my day myself, but never that close to the operator.....

--->Paul

If you contact the pump maker or a vendor who sells them they likely would be able to tell you the function of the screw.

By the way, www.northerntool.com has a complete line of hydraulic fittings and hose; they even have hoses made to length. It's good stuff and you might even save a few bucks in the process.