how to install case drain on excavator

Installing a case drain on an excavator is an important step in ensuring the proper functioning and longevity of hydraulic attachments, such as hydraulic breakers or augers. The case drain is designed to prevent excess pressure from building up in the attachment’s hydraulic circuit. Here’s a general guide on how to install a case drain on an excavator:

Materials You’ll Need:

  • Case drain kit (provided with the hydraulic attachment)
  • Wrenches
  • Hydraulic hose (if not included in the kit)
  • Hydraulic fittings (if not included in the kit)
  • Teflon tape or thread sealant
  • Safety gear (gloves, safety glasses)


  1. Safety Precautions:
    • Ensure the excavator is turned off and the hydraulic system is depressurized before starting the installation. Safety should be a top priority throughout the process.
  2. Identify the Attachment Ports:
    • Locate the hydraulic attachment ports on your excavator. There should be an inlet port for hydraulic fluid (usually labeled “IN”) and an outlet port for hydraulic return (usually labeled “OUT”). The “OUT” port is where you will connect the case drain.
  3. Assemble the Case Drain Kit:
    • If the case drain kit is not pre-assembled, follow the manufacturer’s instructions to assemble it. This typically involves attaching fittings and hoses to the provided components.
  4. Identify the Case Drain Port:
    • On the hydraulic attachment itself, identify the case drain port. This port may be labeled “Case Drain” or “Return.”
  5. Select the Attachment Port:
    • Choose the hydraulic outlet port on the attachment to connect the case drain hose. Make sure it’s accessible and does not interfere with the attachment’s operation.
  6. Attach the Case Drain Hose:
    • Connect one end of the case drain hose to the selected port on the hydraulic attachment. Use the appropriate fittings and follow the manufacturer’s instructions for the connection. Use Teflon tape or thread sealant on the fittings if required to prevent leaks.
  7. Route the Hose:
    • Carefully route the case drain hose from the attachment to the excavator. Ensure that it is securely fastened along its path to prevent damage or interference.
  8. Connect to the Excavator:
    • Connect the other end of the case drain hose to the “OUT” port on the excavator’s hydraulic system. Use the appropriate fittings and sealant as needed.
  9. Secure and Protect the Hose:
    • Use clamps or zip ties to secure the case drain hose along its route to prevent it from dangling or getting caught on obstacles during operation. Protect the hose from sharp edges or hot surfaces that could cause damage.
  10. Test the System:
    • With the case drain hose connected, start the excavator and operate the hydraulic attachment. Check for any leaks or issues with the case drain system. Ensure that the attachment operates smoothly without excessive pressure buildup.
  11. Complete the Installation:
    • Once you are satisfied with the installation and there are no leaks or problems, secure any loose ends of the case drain hose and ensure it is well-protected.

Properly installing a case drain on your excavator is crucial to maintaining the hydraulic attachment’s functionality and preventing damage to the equipment. Always refer to the specific instructions provided by the attachment and excavator manufacturers for any additional guidance or requirements.

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