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Case 1840 Skid Steer Tandum Pump No Steering

Discussion in 'Skid Steers' started by chyer3, Oct 19, 2021.

  1. chyer3

    chyer3 New Member

    Joined:
    Oct 19, 2021
    Messages:
    3
    Location:
    Oklahoma
    Case 1840 ran low on hydraulic fluid. When refilled, bucket moves fine. Good motion and quick response to stick inputs. However, no movement - no forward, backwards, and no turning. The engine doesn’t sound like it is trying to make the skid steer move when pushing on the sticks. I know it is in the Tandum pump under the seat. Just not sure if it cavitated and needs primed or if air needs bled out or what. I’ve read where you need to put fluid directly into the Tandum pump, it just doesn’t explain where to actually do that at. Worked fine in the AM. Stopped for lunch. After lunch fueled up, topped off the hydraulic oil and that is when the issue started. Disengaged the valves to free wheel, drug it up on my trailer and brought it back to the shop. Here it sits.
     
  2. Vetech63

    Vetech63 Senior Member

    Joined:
    Aug 10, 2016
    Messages:
    4,551
    Location:
    Oklahoma
    Sounds like your charge pressure is way too low or gone. Filling the pump housing is only filling the case drain area. You need to check the charge pressure, its what fills the pistons in your drive pumps.
     
    mg2361 likes this.
  3. chyer3

    chyer3 New Member

    Joined:
    Oct 19, 2021
    Messages:
    3
    Location:
    Oklahoma
    I have a gauge, but I’m unfamiliar where to hook it in to check the charge pressure on the 1840. Any suggestions on where to hook in to confirm low or no charge pressure?
     
  4. heymccall

    heymccall Senior Member

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    Feb 19, 2007
    Messages:
    3,700
    Location:
    White Oak, Pa
    Is the tandem pump turning?
     
  5. chyer3

    chyer3 New Member

    Joined:
    Oct 19, 2021
    Messages:
    3
    Location:
    Oklahoma
    It’s a direct mount, as I am sure you already know, so it’s hard to see for sure. I do see it vibrate when I start the engine, it tends to vibrate quicker as I throttle up. Could simply be from the engine of course, though. One thing I do feel confident in, I believe I can hear the pump turning. I hear a metallic whirling noise, similar to a gear being spun.
     
  6. Tones

    Tones Senior Member

    Joined:
    Mar 15, 2009
    Messages:
    2,295
    Occupation:
    Ex land clearing contractor, part-time retired
    Location:
    Ubique
    An old way of listening to internal noise was to put a metal bar on say a pump ant other to your ear. The noise transfers through it and you can quite clearly. :D
     
    Vetech63 likes this.
  7. Tones

    Tones Senior Member

    Joined:
    Mar 15, 2009
    Messages:
    2,295
    Occupation:
    Ex land clearing contractor, part-time retired
    Location:
    Ubique
    Gees my proof reading is terrible, last word missing is hear.:)
     
  8. alrman

    alrman Senior Member

    Joined:
    Jun 20, 2009
    Messages:
    3,042
    Occupation:
    Diesel Fitter;Small Business Owner;Cleaner
    Location:
    QLD Australia
    The no oil bit is scary! :eek:
    You could have charge pump issues, as mentioned above OR it could have stripped the drive shaft coupling, not allowing the the pumps to turn.
    Let's hope for the latter ....

    You'll find some test procedures HERE
     
  9. Vetech63

    Vetech63 Senior Member

    Joined:
    Aug 10, 2016
    Messages:
    4,551
    Location:
    Oklahoma
    LOL..........what's a pump ant?:p:D