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Moving Dead John Deere 790 Excavator

Discussion in 'Excavators' started by Jon Bradtke, Aug 16, 2017.

  1. Jon Bradtke

    Jon Bradtke Member

    Joined:
    Aug 16, 2017
    Messages:
    20
    Location:
    New York
    Hello all,

    Please excuse my inexperience as I am new to the heavy equipment area. We found a great deal on a John deere 790 excavator. Engine runs great and the excavator appears to be in great shape. This excavator has two main hydraulic pumps (3,770 psi each 63.4 gpm) and a small pilot pump. One of the hydraulic pumps is dead and I need to get this thing loaded on a lowboy and transported 30 miles to our shop. I don't have access to another excavator or heavy equipment to move it. How can I get this thing moving? My first thoughts were to either plumb in a tractor PTO hydraulic pump (approx 2,500 psi) or to try and run the entire excavator off of one main pump. Please help as we really want to get this excavator moved on a lowboy and to our farm for some much needed work!!!

    Any help would be great!!

    -Jon
     
  2. old-iron-habit

    old-iron-habit Senior Member

    Joined:
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    Occupation:
    Retired Cons't. Supt./Hospitals
    Location:
    Moose Lake, MN
    I have heard of hooking external hydraulic source directly to the track drive motors and walking them that way. Might be an option if other functions work. You may also be able to tie into the other pump with tee's and valves and run the tracks off the other pump and control. Why not change the pump where it is now before you move it?
     
  3. Tones

    Tones Senior Member

    Joined:
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    Occupation:
    Ex land clearing contractor, part-time retired
    Location:
    Ubique
    I firmly suggest you change the pump before you do any further damage. It's very likely it will have debris in the hydraulic system now and running it will only make a big bill huge. The other option is to run away from it, fast.
     
    mikebramel likes this.
  4. Jon Bradtke

    Jon Bradtke Member

    Joined:
    Aug 16, 2017
    Messages:
    20
    Location:
    New York
    I cannot work on it where it is. It's located at the sellers friends farm. He wants it moved asap. I realize running the dead pump is a bad idea and I don't plan on it. The idea of a external hydraulic system seems like the best idea. Does anyone know someone who has done this??
     
  5. mitch504

    mitch504 Senior Member

    Joined:
    Feb 27, 2010
    Messages:
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    Location:
    Andrews SC
    I would pull the sun gears and use a cable, snatch blocks, and some other machine to pull it on the lowboy. With a few snatch blocks you can use most anything to get it on the lowboy. A good backhoe would probably pull it up there direct if you use a drop-neck or long ramps. For that matter, if you use a drop-neck, you could use the tractor that pulls the lowboy to pull it up there. If you have enough blocks, you could load it with a 4-wheeler.

    I wouldn't try to move it under it's own power until it's cleaned out. A little debris in the lines and you can easily do more damage than the value of a 790.
     
    Ronsii likes this.
  6. Bls repair

    Bls repair Senior Member

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    Equipment operator,mechanic
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    S E Pa
    I would get a price to move it from some one that scraps old equipment
     
  7. Former Wrench

    Former Wrench Senior Member

    Joined:
    Jan 3, 2014
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    Occupation:
    Retired
    Location:
    Montesano, WA
    Bls's reply made me think that maybe a heavy lift salvage wrecker from the area might be another idea for a bid.