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Thread: D4 78a scraper puller

  1. #1
    Join Date
    Apr 2009
    Location
    Arkansas
    Posts
    8

    Default D4 78a scraper puller

    I have a d4d 78a dozer, and have found a midland m86 8yd dirt pan locally. I would like to use the dozer to pull the pan, but I have no auxiliary hydraulics to operate it, and the machine doesn't have hydraulic tilt. How can I get hydraulic power to operate the pan?

  2. #2
    Join Date
    Nov 2006
    Location
    Bakersfield CA
    Posts
    1,723

    Default

    I tied into the front pulley. Took the pulley off. Took it to a machine shop so they had a pattern. They made me flange the would bolt to front of crank and pulley. Canít remember but the flange had the same size keyed shaft as the 25 gpm pump. Used a chain coupler between the two.

    On my D8 Brian Boaz built me a hydraulic pump adapter to go where the generator was.

  3. #3
    Join Date
    Nov 2017
    Posts
    678

    Default

    1234567890
    D4 6U,1943 D4 2T,Laplant Choate C41 Carrimor Scraper

  4. #4
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
    Posts
    15,321

    Default

    Some options....
    Find a #143 93Fxxxx triple valve (35 gpm) Hydraulic Control Unit like was originally used (good luck with that).
    Find a late model BEGE (rear mount) two valve hydraulic control. (equally rare)
    Build a hydraulic control out of current components driven from the current pump drive, front pulley or rear mount.

  5. #5
    Join Date
    Nov 2017
    Posts
    678

    Default

    isn't there a place to drive a pump on the left front of the engine? i think it drives off of the water pump drive somehow??
    D4 6U,1943 D4 2T,Laplant Choate C41 Carrimor Scraper

  6. #6
    Join Date
    Aug 2019
    Location
    Washington
    Posts
    165

    Default

    I imagine a person could purchase an electric hydraulic pump system and a battery or two and tack them on somewhere.
    Cat D6 5R

  7. #7
    Join Date
    Mar 2009
    Location
    yuba city,california
    Posts
    1,497

    Default

    Quote Originally Posted by Old Magnet View Post
    Some options....
    Find a #143 93Fxxxx triple valve (35 gpm) Hydraulic Control Unit like was originally used (good luck with that).
    Find a late model BEGE (rear mount) two valve hydraulic control. (equally rare)
    Build a hydraulic control out of current components driven from the current pump drive, front pulley or rear mount.

    I consider myself fortunate; I got a nice 143 awhile back from a BB user that junked his D4C out, and just scored a 2 valve Be-Ge with large tank. Life is good.
    ***sorry for gloating. No plans to sell either, as I have plenty of uses for these pumps myself***JM

  8. #8
    Join Date
    Nov 2006
    Location
    Victoria Australia
    Posts
    352

    Default take care

    Just a word of caution if you are going to a gear drive from timing gears. Neighbours have D68u they set up. Not sure if pump was too big or relief valve too small or set too high . End result was broken timing gears, lucky it didn,t do more damage. Should be good if you can get it set up.cheers WF

  9. #9
    Join Date
    Apr 2012
    Location
    Moose Lake, MN, USA
    Posts
    3,618

    Default

    Front pump as Oilslick said would be clean, have live power and not rip anything up. Good luck.
    1937 Cat #11 tandem auto patrol,diesel, w/plow and wing, 6K506SP, 1937 RD 4 Ag Crawler RD5356, 1939 Cat 22 2F5429, 1952 Model 212 Grader 9T03427, 1953 2U D8 Dozer 2U20751, 1961 922A Rubber Tired Loader, 59A812, LeTouneau LS Cable Scraper, Cat/Lincoln 600 AMP Dual Welder, DW-21 Cat Scraper, DW-10 dump wagon/water wagon

  10. #10
    Join Date
    Nov 2017
    Posts
    678

    Default

    i could be wrong but i think hus tractor aleady has hydraulics for the blade. what he needs is advice on how to get remotes on the rear and valves to run them. if you want to use your hydraulic control that controls the blade then all you need is a diverter valve behind the existing valve and rear remotes plumbed into it. the only problem is you will loose blade functions while you use the scraper but all you need to do is flip the valve and you are back in business. the 7U and 6U are already equipped like this.
    D4 6U,1943 D4 2T,Laplant Choate C41 Carrimor Scraper

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