410 backhoe power steering problem

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410 backhoe power steering problem

Mike Grodecki

HI: I have a 74 Jd 410 backhoe,The type with the drag links.The is no power steering at all,I checked the psi 2700 on main Hydraulic line where it goes to steering colum.I did not check it at the colum which I should have.I replaced all the O rings and seals in the colum which is what i though was the problem.every thing looks to be in good working order in the colum.I'm not understading how this system work,every thing on the shaft free wheels,so how does it make power steering.I'm not sure where to look now??? any help would be apprciated. thanks Mike.

Dale G. Basgall

Mike : Underneath the steering rod and tube housing there is a hydraulic valve called the steering valve, motor etc. anyway the one you have isn't that bad compared to the larger yellow iron loaders and such , however you need to disassemble it and re-assemble it. That valve is used on alot of different equipment in the field other than Deere products so it's a common kit.

You need to really clean the thing up in hot soapy tide and water. It needs to be as clean as your dishes. I think there is eight twelve point screws in the bottom of those, don't losen them yet. Lay out a white towel for your work area and a vise or something to hold the housing when you assemble it is ok but not really necessary.

Mark your seams with a punch so you dont mix up a housing or have to really think about it to much. Remove every piece from the housing , all fittings, then the eight bolts, carefully slide the stuff apart and try not to hold the valves to long in your hands, they expand rapidly and are hard to install if the housing is cool and the valve is warm.

There are a couple pins in those I have found broken before so get the seal kit and then carefully take it apart and spotlessly clean each piece and dry it and lay it out on the table, bolts included. You will easily slide the parts together if they are spotless and also look for any really shiny spots on the rotating valves, the spring probably broke also.

Anyway it's not rocket science and I am sure you can handle it, usually a schematic comes with those kits if I remember right.

Dale G. Basgall

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