Electric Power Steering, v. 2.0

Discussion in 'General IH Tech' started by George Womack, Sep 8, 2019.


  1. George Womack

    George Womack Y-Block King

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    Some of you may have seen my thread from July 2017 regarding the installation of electric power steering in my yellow 800. I've been thrilled with the way it works, but not completely happy with the way I did it. I think it's much more desirable to mount the unit inside the dash where it is out of the elements. For two years I've been threatening to do another installation in my white 800, this time the right way. I've been gathering parts, and finally got started this week. The unit fits nicely inside the 800 dash after removing the steering column support that is welded to the dash. I still have to do a lot of test fitting, fabricating, etc., but it looks like it will work just fine.

    EPAS 4.JPG
     
    Last edited: Sep 8, 2019
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  2. stevewillis

    stevewillis Farmall Cub

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    I missed your July 2017 thread. I like everything about this.
     
  3. mallen

    mallen High Wheeler

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    I've heard that some people have used the electric power steering from a Prius. It might work in a scout, but probably not heavy enough for a truck.
     
  4. jeff campbell

    jeff campbell Lives in an IH Dealership

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    Looked this up earlier GW. 57_f05d07ec-800f-45ac-a156-42d5a251a1db_1400x.jpg 57_e3698a42-6aba-424e-87af-8c4b133d318d_540x.jpg
     
  5. Scootr

    Scootr Farmall Cub

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    Hmm. First time I heard about this electric steering. How does it compare to the mechanical steering? Is it mostly for stock builds, or can the electric handle mods for wheeling? Like over size tires.
     
  6. jeff campbell

    jeff campbell Lives in an IH Dealership

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    George Womack did. Way to go for improvements.
     
  7. George Womack

    George Womack Y-Block King

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    It is the difference between make-your-arms-sore and one finger steering. I've had it on my yellow 800 (the first one in my signature) for a little over two years now, and have done some pretty extreme trails. I've done three runs of Trough Trail near Kremmling, CO, which is rated as the third hardest trail (of 90 trails) in the Guide to Northern Colorado Backroads & 4-Wheel-Drive Trails by Charles A. Wells and Matt Peterson.



    .
     
    Last edited: Sep 9, 2019
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  8. RinTX

    RinTX High Wheeler

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    I’ve been seriously considering such a mod for my 73 1010 Travelall. Not enough time and not enough money...
    Yet
     
  9. Bill USN-1

    Bill USN-1 Moderator Staff Member Moderator

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    I tried Georges at RMIHR this year and it convinced me to give it a try.
    Been toying with the idea for a while.
    Doing some research the Saturn Vue seems to be the strongest assist due to the 4000lb SUV it was in.
    I bought a complete pull from eBay so I have the upper column and the lower shaft to allow me some custom fabrication in my next project.
    Scout 80 with Turbo 196 and 700r4.
    The volvo and prius could work but are lighter duty units.
    These go inline with the stock manual box, not a PS box.
    If the electric unit goes bad your still just back to the factory manual box.
     
  10. mallen

    mallen High Wheeler

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    Travelall is heavier though. I'm not sure the Saturn motor would be large enough. You need one from a full sized truck.

    There are some trucks that use a electric pump on a hydraulic steering gear. I've wondered if that could work on the full sized trucks.
     
  11. George Womack

    George Womack Y-Block King

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    I put in a full day today and got the Saturn Vue EPAS unit mounted in the dash, and fabricated a steering column using parts from the Vue column mated to the Scout upper column.

    This shows the EPAS unit mounted to a Style A bracket from epowersteering. This bracket has a nice flat base that makes it easy to attach to other brackets as needed. The output shaft of the unit is a 16.5mm-36 spline. epowersteering sells a U-joint that adapts the output shaft to a 3/4" DD shaft, seen at the left. For the lower shaft I used a piece of the stock 3/4" round shaft and ground both ends to 3/4" DD. I used a Borgeson 3/4" DD to 3/4"-36 U-joint to connect to the stock steering gearbox. I cut the input shaft shorter and ground it to a 3/4" DD and installed a 3/4" DD to 3/4" DD coupler from Borgeson. This will connect to a short piece of the Scout shaft, also ground to 3/4" DD.


    EPAS 7.JPG

    The parts seen covering the input shaft are from the Vue column. It just so happens that the Scout jacket tube is a tight press fit over this assembly. The holes allow access to the set screws of the coupler.
    EPAS 11.JPG




    Scout upper jacket tube iinstalled. A 2" exhaust clamp will hold it in place.
    EPAS 12.JPG
     
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  12. George Womack

    George Womack Y-Block King

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    A piece of 1/4" X 1" flat bar (painted yellow for clarity) will serve as the support for the EPAS unit. At the left it is bolted to the clutch pedal/brake pedal bracket. At the right end it bolts to the right hand stock hole for the parking brake handle assembly. You can see where I cut out the lower steering column support bracket. This will be replaced with another flat bar which will provide the other mounting hole for the parking brake handle.
    EPAS 9.JPG
     
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  13. Bill USN-1

    Bill USN-1 Moderator Staff Member Moderator

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    Nice work George.
    I was already researching the shaft couplers so this helps.
     
  14. George Womack

    George Womack Y-Block King

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    Bill, you'll see this for yourself, but I just want to point it out. If/when you grind or machine the input shaft to 3/4" DD, you'll want to use a splined part of the shaft. The non splined part is too small to make a 3/4" DD.

    EPAS 6.JPG
     
    Last edited: Sep 18, 2019
  15. Bill USN-1

    Bill USN-1 Moderator Staff Member Moderator

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    Thanks George.
     
  16. RinTX

    RinTX High Wheeler

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    I feel stupid but here goes - what is “3/4” DD”?
     
  17. winchested

    winchested High Wheeler

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    Standard aftermarket steering shaft shape.
     
  18. jeff campbell

    jeff campbell Lives in an IH Dealership

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    Nice job GW
     
  19. walkersscout

    walkersscout High Wheeler

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    Pretty sure a 3/4 DD would be a C cup.
     
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  20. George Womack

    George Womack Y-Block King

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    Double D or DD is a common shape for steering shafts. It is a tried and true type of shaft that guarantees positive connection and no possibility of twisting. Many U-joints and couplers are available to connect DD shafts to other types of shafts and steering gear boxes. Smooth round 3/4" shafts can easily be machined or ground to a DD shape.


    Steering shaft styles.jpg
     
    Last edited: Sep 19, 2019
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