• Topic ID: id_16157888
  • Version: 6.0
  • Date: May 20, 2022 6:19:28 AM

Hydraulic Pump Replacement

Prerequisites

Overview

Procedure

  1. Raise the Table to maximum height.
    note:

    If the Table can not be raised up to maximum height to attach the Table Support Tool, lower the Table to the mechanical down limit position after performing steps Step 2 through Step 9.

  2. Perform this step if applicable:

    (For Global PET/CT Table, with fixed position IMS) Move the Cradle to OUT limit position.

    (For Global PET/CT Table) Move the Cradle and IMS to OUT limit position.

    (For GT1700 and GT2000 Table) Move the Cradle and IMS to OUT limit position.

    (For GT1700V Table) Move the Cradle to OUT limit position.

  3. Remove power from Table by turning off 120VAC, Axial Drive and HVDC switches on Service Switch Panel.
  4. Remove the following Table covers:

    • Top Cover (Left)

    • IMS Rear Cover

    • IMS Side Cover (Right/Left)

    Figure 1. Table Covers

  5. Attach the Table Support Tool to the Table.
    1. Perform this step if applicable:

      (For GT1700 and GT2000 Table) Skip this step.

      (For GT1700V Table) Skip this step.

      (For Global PET/CT Table and Global PET/CT Table, with fixed position IMS) Release Transporter and manually push up against the rear Hard Stop.

      Figure 2. Table Pushed Against Hard Stop (Global PET/CT Table)

      • warning
      • crash hazard!
      • The Table is very heavy and can move if The Global PET/CT Table transporter is not secured!
      • The transporter must be secured from moving before attaching the table support tool.
    2. Perform this step if applicable:

      (For GT1700 and GT2000 Table) Skip this step.

      (For GT1700V Table) Skip this step.

      (For Global PET/CT Table and Global PET/CT Table, with fixed position IMS) Attach one of the “L” shaped alignment blocks to the front linear rail (The alignment blocks and hardware came with the Table and should have been stored away during install). Tighten bolt as shown in order to secure the Transporter.

      Figure 3. Tighten Alignment Block (Global PET/CT Table)

    3. The adjuster of the support tool A should be partially extended, about 3 cm, before supporting the Table.

      Figure 4. Table Support Tool

    4. Attach the support tool A to the left top frame, and turn the set screw to CCW to fix the support tool A.

      Figure 5. Support Tool 'A' Attachment (GT1700 ,GT2000 and Global PET/CT Table)

      Figure 6. Support Tool 'A' Attachment (Global PET/CT Table, with fixed position IMS and GT1700V Table)

    5. Attach the other support tool A to the right top frame, and turn the set (hexagon) screw to CCW to fix the support tool A.
    6. Attach the support tool B to the support tool A using 4 screws.
    7. Power up the Table from the Service Switch Panel.
    8. Extend the adjusters by turning them so that the adjusters touch the floor, and lower the Table onto the support. Make sure that there is no oil on the floor and the support tool is installed perpendicular to the floor.

      Figure 7. Table Support Tool Attachment (GT1700, GT2000 Table and GT1700V Table)

      Figure 8. Table Support Tool Attachment (Global PET/CT Table and Global PET/CT Table, with fixed position IMS)

    6. Notice Image
    • notice
    • Confirm the following before removing power from Table:
    • - The floor under the support tool is not slippery.
    • - The support tool is installed perpendicular to floor.
    • - The support tool is firmly fixed to the table top frame by set screws.
    • - The support tool is securely holding the full weight of the Table.
  6. Remove power from Table by turning off 120VAC, Axial Drive and HVDC switches on Service Switch Panel.
  7. Mark the position of pump upper cover on both sides for re-installation.
  8. Disconnect the cable connectors of the tape switches and touch sensors.
  9. Remove six (6) secrews holding the both sides of the pump upper cover, and remove the pump upper cover.

    Figure 9. Pump Upper Cover Removal

    note:

    If the Table Support Tool can not be used, lower the Table to the mechanical down limit position.

  10. Cut any tie-wraps holding the cables to the upper frame of the pump assy.
  11. Disconnect the cable connectors.
  12. Disconnect the high-pressure hose from the pump (a oil may spill out from the hose).
  13. Disconnect the return hose from the pump (a oil may spill out from the hose).
  14. Unscrew 4 nuts under the pump assy.
  15. Loosen 4 (x2) screws on both side of the pump assy.

    Figure 10. Hydraulic Hoses Removal (GT1700 ,GT2000 and Global PET/CT Table)

    Figure 11. Hydraulic Hoses Removal (Global PET/CT Table, with fixed position IMS and GT1700V Table)

  16. Lift the pump assy, and remove the it from the Table.

    Figure 12. Pump Assy Removal

  17. Remove the bracket from the pump, and attach the bracket to the new pump.
  18. Install the new pump assy by referring to Step 16 through Step 7.
  19. Power up the Table from the Service Switch Panel.
  20. Raise the Table to its highest position, and verify that the new pump is securely installed.
  21. Turn off all 3 switches (Axial Drive, HVDC, 120VAC).
  22. Remove the Table Support Tool from the Table.

Finalization

  1. Power up the Table from the Service Switch Panel.
  2. Raise and lower the Table repeatedly to remove air from the hydraulic system.
  3. Perform pump lubrication, if necessary.
    1. Pry a lid up using a flat-head screw driver.

      Figure 13. Lid of Pump

    2. Pour approximately 100cc of the oil into the pump.
    3. Power up the Table from the Gantry Service Switch.
    4. Raise the Table as high as possible.
    5. Turn off the Table from the Gantry Service Switch.
    6. Repeat 3.a through 3.e until Table height reaches mechanical Up-limit.
    7. Check the level of the oil by using a stick such as tie-wrap, specification is shown in illustration below.

      Figure 14. Check Oil Level

  4. Turn off all 3 switches (Axial Drive, HVDC, 120VAC), and re-install the Table covers.