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Ex120 controls not working after maintenance

Discussion in 'Excavators' started by shelbyk7, Jun 23, 2022.

  1. shelbyk7

    shelbyk7 Well-Known Member

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    Have a ex120 that’s been down a few months for maintenance and started it up today and when I hopped in it and unlocked the pilot, nothing happened.

    changed hydraulic fluid, rebuilt lift pump

    what’s the most likely issue to check for?
     
  2. skyking1

    skyking1 Senior Member

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    If you did not bleed the pumps stop!
    You have to take those two horking big nuts off on my 120 to get the air out of the pumps I don't know what yours is like. Open up the pump compartment and take a picture if you haven't bled them yet and know what I'm talking about. I'll take a picture of what I've got to tell you what I'm talking about.
     
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  3. shelbyk7

    shelbyk7 Well-Known Member

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    I bled the pumps at the 6mm and 8mm allen head screws circled in picture I have below



     

    Attached Files:

  4. skyking1

    skyking1 Senior Member

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    Okay good those are completely different pumps but those ought to work for bleeding.
     
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  5. shelbyk7

    shelbyk7 Well-Known Member

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    can it take a while to get the pilot all primed up? I could hear something really faint when moving the sticks


     
  6. skyking1

    skyking1 Senior Member

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    I don't know when I serviced mine of course with different pumps it was ready to rock and roll immediately. I did the 2,000 hour with new oil and pilot filter etc.
     
  7. shelbyk7

    shelbyk7 Well-Known Member

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    Did you prefill the pilot filter canister with oil ?

    i also have had a slow leak shown as #2 in attached picture

    being low and a slow leak, it could have in theory leaked a lot of pilot circuits fluid out and take a while to prime it?
     

    Attached Files:

  8. skyking1

    skyking1 Senior Member

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    I don't recall filling any filter.