• Topic ID: id_23554531
  • Version: 1.0
  • Date: Oct 9, 2018 1:40:51 PM

Heat Exchanger Pump Replacement

Prerequisites

Overview

The procedure provides instructions to remove old pump and install new pump. This procedure is applicable to Heat Exchanger Pumps with and without flow sensor circuit boards.

1 Heat Exchange Pump Removal

Procedure

    • warning
    • Potential for ShocK.
    • Voltage may be present.
    • Use proper lockout/tagout procedures before replacing components.
  1. Move the table to its home position.
  2. Remove right side gantry cover.
  3. Turn OFF all three switches (HVDC ENABLE, AXIAL DRIVE ENABLE, and 120 VAC) on the Service Switch Panel.
  4. Remove scan window.
  5. Remove gantry left side, top, and front covers.
  6. Rotate the gantry so the tube is at the 2 o'clock position.
  7. Remove the ORP by following the procedure for ORP Replacement
  8. Remove the 4 M6 screws (Figure 1) that mount the pump to the 107 weight stack bracket.

    Figure 1. Pump Mounting Screws

  9. Disconnect Heat Exchanger Pump 120 VAC connector J52. See Figure 2

    Figure 2. 208 VAC connector and front M6 nuts

  10. Remove power interface board cover.

    Figure 3. Interface Cover

  11. Disconnect pump from heat exchanger at quick disconnect. Line the slot up with the pin and push. The pump should easily disengage (See Figure 4).

    Figure 4. Align Pin and Slot

  12. Disconnect oil hose from X-Ray tube.
  13. Remove the two bolts from the safety mechanism and disconnect the oil hose.

    Figure 5. Safety Mechanism

  14. Position the hose and pressure sensor wiring aside.

    Figure 6. Pump Removal

  15. If current pump installed has flow sensor circuit board, disconnect the pressure sensor connector, J51

    Figure 7. Pressure Sensor Connector (J51) Removal

  16. Remove pump and hose from gantry.

2 Heat Exchanger Pump Installation

Procedure

  1. Position the pump and connect pump to Heat Exchanger at quick disconnect. Make sure you align the pin and slot, then connect. See Figure 4. Once connected, rotate the collar so the pin and slot are not aligned.
  2. Route the hose to the tube. It routes underneath the Heat Exchanger shroud, but between the shroud and the clear plastic power interface board cover.

    Figure 8. Hose Routing

  3. Connect the pump hose to the tube. Secure the quick disconnect using the safety locking mechanism. The torque spec. for the quick disconnect safety mechanisms is 9.9 N-m (7.3 lb-ft, 88 lb-in, 101 kg-cm), however, if the locking mechanism rotates in relation to the quick disconnect, tighten slowly until it does not do so.
    note:

    Do not severely overtighten the M6 bolts. Doing so can cause the quick disconnects to leak.

  4. Install the Power Interface board cover.
  5. Connect pump 208VAC connector.
  6. Install the ORP by completing the ORP Replacement procedure.
  7. Install the 4 M6 Heat Exchanger pump mounting screws. If you just replaced the heat exchanger, it may require some force to realign the pump. Apply final torque to the four M6 screws:
  8. If new pump has flow censor circuit board, connect the pump circuit board connectors to the pressure sensor connectors (J51).

    Figure 9. Pressure Sensor connector (J51) mated with pump circuit board connectors.