Added Auxiliary Hydraulic Pump to 400
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Thread: Added Auxiliary Hydraulic Pump to 400

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    Added Auxiliary Hydraulic Pump to 400

    I just finished up adding an auxiliary hydraulic pump on the 400. I previously built a loader and powered it initially from the onboard system. It was slow but serviceable. The biggest challenge to adding a pump was finding a hole to put an reserve tank. The uprights aren't tubes, so a tank needed fabrication and installation in the only available real estate under the fender.
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    Grandpa Jay
    1981 JD400 a long ways from stock

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    I thought the look and plumbing would be neater if the filter were integral to the tank. The filter is the same as used for the transmission. The pump is a .434 cubic inch (a little less than 7 gpm at 3600). The loader arms (no implement) raise in 9 seconds at 2400 rpm (a common operation rpm for me). This is about twice as fast as the onboard output.
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    Grandpa Jay
    1981 JD400 a long ways from stock

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    The pump bracket is bolted to the front motor mounts. The Lovejoy coupling is recessed into the PTO pulley to keep it concentric to the crankshaft and shares the extended key. I turned a tube that duplicated the coupling and the 4F17 pump mounting pattern. Then used that to center and align the pump bracket to tack weld the location. The extra pump holes are there in case the pump needed to rotate some for hose routing.
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    Grandpa Jay
    1981 JD400 a long ways from stock

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    motiv8 (03-22-2017),Pete110 (03-21-2017)

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    Very Nice

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    Sadly, a perfectly good grill had to be sacrificed for the good of the cause. I considered some kind of cover, but it looks okay-especially with the grill guard in place.

    The plumbing change-over was easy. A while ago, I added the 4th and 5th spool to independently operate the deck and 3PH. That is the control on the right fender. I plumbed those valves from the out of the 3 spool stock valve. All I had to do was move the supply pressure from the 3 spool to the 2 spool. Then run the new pump pressure to the 3 spool. It is rather handy to be able to flare/bend tubes and swage hose fittings at home.

    The fill vent is on the left fender and the tank comfortably holds 2 gallons of our favorite Hy-Gard low vis.

    The fender pan got modified in the process to be split and tip up. These were a couple of good between season projects to get done. Now bring on nice weather! Jay
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    Grandpa Jay
    1981 JD400 a long ways from stock

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    Another awesome job! So are the all the hydro ports independent of the tractor now?
    1975 JD 400, 1983 JD 400

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    Quote Originally Posted by mopeman View Post
    Another awesome job! So are the all the hydro ports independent of the tractor now?

    Thanks Kollyn and Mopeman! Yes, all the ports are being fed by the new pump. The loader and curl (that share the original front ports) operate from two of the handles converted to a joystick. The aux rear ports and the aux ports out on the arms are operated by the inner handle. The onboard transmission pump powers the MMM, 3PH, and the power steering assist.
    Grandpa Jay
    1981 JD400 a long ways from stock

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    You are a genius!!! How I wish you were doing bata testing for products you were producing, especially that loader!
    1975 JD 400, 1983 JD 400

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    grandpajay You now have me scratching my head on how to do that on my 318 with 44 loader. I want the pump to run whenever the engine is running and I want to relocate the reservoir so I don't hit my leg on it and to make it easier to get on the tractor. I am also thinking of foot controls for the hydraulics. It seems like a complete remake that I want.
    "Everybody is a genius.
    But if you judge a fish by it's ability to climb a tree, it will live its whole life believing it is stupid."
    Albert Einstein

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    Nice! Great work!

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