Skip to main content

Remove the Lenovo Neptune (TM) liquid assisted cooling module

Follow instructions in this section to remove the Lenovo Neptune(TM) liquid assisted cooling module (hereafter referred to as LACM).


This task must be operated by trained technicians that are certified by Lenovo Service. Do no attempt to remove or install it without proper training and qualification.

About this task

Safety information for liquid detection sensor module cable
sharp edge
Sharp edges, corners, or joints nearby.
  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Power off the server and peripheral devices and disconnect the power cords and all external cables. See Power off the server.

  • Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding system.

  • If the server is installed in a rack, slide the server out on its rack slide rails to gain access to the top cover, or remove the server from the rack. See Remove the server from rack.

Ensure that the handle is installed when removing or installing the LACM. Do not touch the radiator fins. Touching the radiator fins might damage the LACM.
Prepare the following screwdrivers to ensure you can install and remove the corresponding screws properly.
Torque screwdriver type listScrew Type
Torx T20 screwdriverTorx T20 screw
Watch the procedure
  • A video of this procedure is available at YouTube.


  1. Remove the top cover. See Remove the top cover.
  2. Disconnect the pump cable and leak detection cable of the LACM module from the connector on the system board assembly. See Liquid assisted cooling module cable routing.
    • If you need to disconnect cables from the system board assembly, disengage all latches or release tabs on cable connectors first. Failing to release the tab before removing the cables will damage the cable sockets on the system board assembly. Any damage to the cable sockets might require replacing the system board assembly.

    • The connectors on your system board assembly might look different from those in the illustration, but the removal procedure is the same.

      1. Press the release tab to release the connector.

      2. Disengage the connector from the cable socket.

    Figure 1. Disconnecting cables from the system board assembly
    Disconnecting leak detection cable

  3. Route the leak detection cable out of the cable clips on the leak detection module.

  4. Re-install the handle to the LACM.

    1. Place the handle evenly on the LACM and align screw holes.
    2. Tighten the five screws in the installation sequence shown on the heat-sink label. Ensure that the screws are secured in place.
  5. Disengage the LACM from processors.

    1. Fully loosen the eight Torx T20 nuts on the cold plate assembly and radiator.
    2. Carefully lift the LACM from the processor sockets by the handle. If the LACM cannot be fully lifted out of the socket, further loosen the Torx T20 nuts and try lifting the LACM again.
  6. Place the LACM on the shipping tray.
  7. If there is any old thermal grease on the cold plates, gently clean the top of the cold plates with an alcohol cleaning pad.
  8. Optionally, if you do not need to install a new LACM module, remove the radiator tray from the chassis.

    1. Remove the screw on the radiator tray.
    2. Move the radiator tray to the left and lift it out of the chassis.
  9. Remove the PSU air duct. See Remove a power supply unit air duct.
After you finish
  • If you are instructed to return the component or optional device, follow all packaging instructions, and use any packaging materials for shipping that are supplied to you.