Is it OK for the system to go to relief all the time?

[David Devuono]

In my opinion for what its worth, 1.75 inch bore, even if you set the PRV in the steering circuit at 1,000 PSI, will produce 2000 or more pounds of push. Seems like a lot. My massey PS steering has its own 800 PSI pump and smaller rams. I can 1 finger the steering. (I have no loader) I would start out with 500 PSI with that size rams and if all is okay, keep it there. With the adjustable flow divider you can adjust it as required to get the speed (flow) required on the steering.

 

[gsdavis1]

I am attaching a schematic of my tractor hydraulics.

I am unsure where to connect the lines that need to return to the tank.

What make it so puzzling to me is that this tractor is hydrostatic drive so I believe that both the drive system and other hydraulics share the same tank or resevoir.

I am thinking of attaching to either of the spots highlighted by red circles. This is a line that runs from the filter housing to the left of the drive system.

Any suggestions?

Thanks
Greg

 

[gsdavis1]

Anyone?

 

[gsdavis1]

Alright, I thought I would give an update. I worked on this project just about all day today. Tomorrow I will go and get the hoses made up and hopefully everything will be good to go. I want to thank everyone on this board who helped with this project.

Here are some pictures and explanation

This is the tie rod that I had fabricated. I decided to have the cylinder operate parallel to the front axle, hopefully to be more out of the way when I put the loader on. The cylinder was given to me it is 1.75 bore and 7 inch stroke. THe tie rod is 1/2 inch plate. The extra holes are for adjustment if I have to replace the cylinder in the future, I could use one with a different stroke and just attach it to a different hole. I did weld the tie rod to the spindle and the the cylinder had to have an "eye" welded to it.

Next is a picture of the steering box. It is an eaton steering box that I bought from a lift truck junkyard. Not sure what it came off of. I called Eaton and got the specs. I hope it works. The fittings were capped when I bought it so that was a good sign. The steering column is a mix of the original and the one that came on the hydraulic steering box. It was too short so I cut it and the original one and welded the pieces together. You can hardly tell it was changed. I am 6 foot 5 inches tall so I did extend the column about an inch or so. The brackets for everything took a while to make, with my primitive tools and welding ability.

Here is the Priority Flow Divider. With the steering drag link gone, this seemed like the best spot for it. It looks in the was of the clutch pedal but actually this is about the same amount of space I had when the drag link was there. I decided to go with an adjustable priority flow valve. I bought it of ebay for $50. It does not have an internal pressure relief so I installed an external one. It is the little black box mounted below the PFD. This seemed like the best configuration for conserving space. The relief valve is set a 1500psi from the factory. We will see how that does. I installed some "plugged" ports in both the Controlled Flow side and the Excess Flow side for future pressure testing.

Here is the way I decided to get the flow to return to the tank. This is where my stock fill hole and dipstick were. I used a galvanized "t" from the hardware that is 1 inch by 1/2 inch. I will extend the dipstick rod to compensate for the extra pipe that has been added.

Thanks again to all who helped. Say a prayer that I wont have any leaks and that everything will work well.

Greg

 

[gsdavis1]

OK, I finished up everything this morning. It works great! I will probably post the completed project with a full write up and pictures later. Maybe I should do that in the "Customization" forum.

Thanks

Greg

 

[Gary Sweat]

OK, I finished up everything this morning. It works great! I will probably post the completed project with a full write up and pictures later. Maybe I should do that in the "Customization" forum.

Thanks

Greg

Nice work:thumbsup: I book marked your post so I can go back to it. I really want to do something like this to my 2 wheel drive in the spring. Got to get a few other projects out of the way first.