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Adding a case drain line to a Cat 259b3

Discussion in 'Skid Steers' started by Howey Matt, Jun 10, 2022.

  1. Howey Matt

    Howey Matt Well-Known Member

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    My new trencher attachment has a 3rd hose for a case drain, so I need to add a case drain hookup to the machine. I've found some writeups for other makes and models, but not for the Cat 259b3.

    Does anyone have any experience with this? Where would be the best and easiest spot on the machine to tap into a drain line?

    Thanks in advance.
     
  2. Howey Matt

    Howey Matt Well-Known Member

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    Does anyone happen to have a hydraulic schematic for this machine they'd be willing to share? I'd like to tie the attachment case drain into an existing circuit but I don't know which location would be best. Where do they connect the attachment case drain on the machines with high flow?
     
  3. Nige

    Nige Senior Member

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    Assuming that the Serial Number prefix is YYZ is the S/N above or below 1542.?
    The hydraulic schematic is different depending which group of machines the S/N falls into.
     
  4. Howey Matt

    Howey Matt Well-Known Member

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    Above: YYZ03203
     
  5. Nige

    Nige Senior Member

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    I'll send you a PM.
     
    Howey Matt likes this.
  6. 56wrench

    56wrench Senior Member

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    Just make sure its t’eed into somewhere with zero backpressure or directly into the reservoir above the oil level. Most hydraulic return systems on machines have some amount of backpressure and will cause the seals to leak on some hydraulic motors
     
  7. heymccall

    heymccall Senior Member

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    I is a little slow here, but, isn't the middle port, at the flat face couplings, a case drain circuit?
    Screenshot_20220701-081303_Chrome.jpg
     
  8. Howey Matt

    Howey Matt Well-Known Member

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    Mine doesn't have the 3rd hookup. I've only got two hydraulic couplings and an electrical coupling I've never used.
     
  9. Howey Matt

    Howey Matt Well-Known Member

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    There's a Manual Loader Lowering Valve that connects directly to the drain manifold. It basically allows you to lower the arms manually without the machine running. The current plan is to tie into the low-pressure side of that valve. That seems like the best option to me.
     
  10. Howey Matt

    Howey Matt Well-Known Member

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    Just to confirm, I tested the pressure on the hose between the lowering valve and the drain manifold. 0 psi with the machine running, so I should be good to go.
     
  11. 56wrench

    56wrench Senior Member

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    I would also check that while activating a function both directions to make sure
     
  12. Welder Dave

    Welder Dave Senior Member

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    Could you tee into where the drive motors case drains enter the hyd. reservoir?
     
  13. Howey Matt

    Howey Matt Well-Known Member

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    I was able to put a tee on the low-pressure side of the Manual Loader Lowering Valve - basically between the valve and the drain manifold. From there, I ran a hose to the back of the machine, up to the loader arm, and then to the front of the loader arm with the other quick connects. I've just got the hose zip-tied for now.

    I tested the trencher attachment and everything seems to be working well. I'll keep an eye on it. Thanks for everyone's help, especially @Nige for the hydraulic schematic.
     
  14. Nige

    Nige Senior Member

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    You're welcome, especially seeing as it all worked in the end.