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Remove the water loop

Use this information to remove the water loop.

About this task

Required tools

  • Screwdriver for PH 2, T10, and T15 screws

  • Water loop shipping bracket

  • GPU cold plate handle assembly

  • GB200 NVL4 TIM Jig

  • T15 screwdriver

  • T10 bit together with torque wrench

  • SC777 V4 GB200 Grease SE 7921

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Use eye protection
CAUTION
Eye protection should be worn for this procedure.
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use protective gloves
CAUTION
Protective gloves should be worn for this procedure.
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Danger
DANGER
danger
Risk of electric shock due to water or a water solution which is present in this product. Avoid working on or near energized equipment with wet hands or when spilled water is present.
Attention

  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Turn off the corresponding DWC tray that you are going to perform the task on.

  • Disconnect all external cables from the enclosure.

  • Use extra force to disconnect QSFP cables if they are connected to the solution.

  • To avoid damaging the water loop, always use the water loop carrier when removing, installing or folding the water loop.

  • A torque screwdriver is available for request if you do not have one at hand.

Watch the procedure
  • A video of this procedure is available at YouTube.

Procedure

  1. Make preparations for this task.
    1. Remove the tray from the enclosure. See Remove a tray from the enclosure.
    2. Remove the tray cover. See Remove the tray cover.
    3. Remove the cross bar. See Remove the cross bar.
    4. Remove the rear wall. See Remove the rear wall.
    5. Disconnect all the cables from the GB200-NVL4 board. See GB200-NVL4 cable routing
    6. Remove the PCIe adapter riser assembly. See Remove a ConnectX-7 NDR 200 adapter riser assembly, Remove a ConnectX-7 NDR 400 adapter riser assembly, Remove a ConnectX-8 XDR adapter riser assembly, or Remove the OSFP module.
    7. Remove the E3.S drive cages. see Remove an E3.S front drive cage assembly.
  2. Remove six (6x) screws and six (6x) cable ties from the water loop in the front of the tray.
    Figure 1. Removing cable ties from the water loop

  3. Remove the conduction plates from the GPU cold plates.
    1. Remove three screws from each conduction plate.
    2. Remove two conduction plates from the GPU cold plates.
    Figure 2. Removing conduction plates from GPU cold plates (MCIO breakout board configuration)
    Figure 3. Removing conduction plates from GPU cold plates (Dual CX8 mezzanine module configuration)

  4. Using an alcohol cleaning pad, gently clean off the putty pads from the bottom side of the conduction plates and from the GPU cold plates.
    Figure 4. Conduction plate for GPU cold plate
    • 1 Conduction plate for MCIO breakout board configuration
    • 2 Conduction plate for Dual CX8 mezzanine module configuration


    Figure 5. Cleaning putty pads from GPU cold plates (MCIO breakout board configuration)

    Figure 6. Cleaning putty pads from GPU cold plates (Dual CX8 mezzanine module configuration)

  5. Align the shipping bracket with the two guide pins in the tray; then, install the shipping bracket to the front of the tray.
    Figure 7. Guide pins for shipping bracket in the front of the tray

  6. Install sixteen (16x) PH2 thumb screws on the shipping bracket.
    Figure 8. Installing shipping bracket screws

  7. Remove two (2x) PH2 screws and three (3x) PH2 screws from each side of the tray. Remove total of four (4x) PH2 screws and six (6x) PH2 screws from right side and left side.
    Figure 9. Removing screws from left and rights sides of the tray

  8. Remove twenty-three (22x) T10 screws to release the water loop from the tray.
    Figure 10. Removing water loop screws

  9. Install the T10 extension bit to the torque screwdriver; then, remove eight (8x) T10 screws to release the quick connects from the rear wall.
    Note
    Install the T10 extension bit to the torque screwdriver before removing the screws.
    Figure 11. T10 extension bit

    Figure 12. Removing the quick connect screws

  10. Align the GPU cold plate handles with the guide pins; then, install two GPU cold plate handles to the water loop.
    Figure 13. Installing GPU cold plate handles to the water loop

  11. Fasten eight (8x) thumbscrews to install the GPU cold plate handle. Make sure to follow the sequence shown in the illustration below.
    Note
    Fasten the thumbscrews on the right-side and left-side GPU cold plate handles.
    Figure 14. Fastening GPU cold plate handle screws

  12. Lock the retaining thumbscrew on the GPU cold plate handle.
    Note
    Lock the retaining thumbscrew on the right-side and left-side GPU cold plate handles.
    1. Loosen the nut.
    2. Remove the nut and the washer from the GPU cold plate.
    3. Push the screw into the slot
    4. Re-install the nut and washer back to the GPU cold plate.
    5. Fasten the nut to the screw to secure handle to the GPU cold plate.
      Figure 15. Locking the retaining thumb screw

  13. Install the T15 extension bit to the torque screwdriver; then, loosen twenty-one (21x) T15 thumbscrews to release the GPU cold plate from the GB200-NVL4 board. Make sure to follow the sequence shown in the illustration below.
    Note

    • Screw 16, 17, 18, 19, 20, 21 are ONLY for Dual CX8 mezzanine module configuration. Fasten/loosen fifteen (15x) screws for MCIO breakout board.

    • Loosen the thumbscrews on the right-side and left-side GPU cold plate handles.

    • Installing the T15 extension bit to the torque screwdriver before loosening the screws.
      Figure 16. T15 extension bit

    Figure 17. Loosening GPU cold plate screws

  14. Flip over the water loops and place them on the shipping bracket.
    Figure 18. Flipping over the water loop on the shipping bracket

  15. Fastening eight (8x) PH2 thumbscrews to secure the GPU cold plate handles to the shipping bracket.
    Figure 19. Installing GPU cold plate handles to shipping bracket

  16. Release the quick connects from the rear wall.
    Figure 20. Releasing the quick connects

  17. Flip over the quick connects to the large shipping bracket. Place the quick connect tab under the thumbscrews.
    Figure 21. Placing the quick connects to the large shipping bracket

  18. Fasten four (4x) PH2 thumbscrews to secure the quick connects to the shipping bracket.
    Figure 22. Securing the quick connects to shipping bracket

  19. Using an alcohol cleaning pad, gently clean the old PCM and putty pads on the GB200-NVL4 boards and the water loop cold plates.
  20. Hold the shipping bracket touching point (marked in blue). Remove the shipping bracket from the tray.
    Figure 23. Removing the shipping bracket

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.