• Topic ID: id_12374877
  • Version: 1.5
  • Date: Feb 19, 2020 4:48:08 PM

Cradle Latch Block Replacement

Prerequisites

Table 1 Personnel requirements
Required persons Preliminary requirements Procedure Finalization
1 Not Applicable 50 minutes 5 minutes
Table 2 Tools and test equipment
Item Quantity Effectivity Part number Manufacturer
Non-Ferrous Service Tool Kit 1 -

5112581

 -
Table 3 Consumables
Item Quantity Effectivity Part number Manufacturer
Loctite 242 0.5 CC -

46-170686P1

 -
Table 4 Replacement parts
Item Quantity Effectivity Part number Manufacturer
Cradle Latch Cable (cut to 1500 mm) 1 -

Refer to FRU Manual

 -
Cradle Latch Housing 1 -

Refer to FRU Manual

 -
Table 5 Safety
  • caution
  • PINCHED FINGERS
  • FORWARD MOVEMENT OF CRADLE CAN PINCH FINGER WHILE HOLDING DOWN CRADLE LATCH BLOCK.
  • MOVE CRADLE FORWARD SLOWLY AND DELIBERATELY UNTIL BOTTOM EDGE OF CRADLE SUFFICIENTLY COVERS TOP OF CRADLE LATCH BLOCK SO THAT YOU CAN REMOVE YOUR FINGER FROM BLOCK.

Overview

This procedure outlines the necessary steps for replacing the cradle latch housing for a 32-channel system. It applies to all DV tables.

Procedure

  1. Undock the patient table and move it out of the magnet room.
  2. Remove the upper bellows and left lower base side cover. See Patient Table Upper Bellows and Lower Base Side Cover Removal.
  3. Raise the table to its maximum height.
    • warning
    • Risk of personal injury
    • Severe injury can occur if the table is accidentally lowered during maintenance.
    • When doing maintenance with the table in the Up position, make sure the lock bar is safely engaged.
  4. Lower the table lock safety bar. Lower the table and verify that all its weight is resting on the lock bar.

    Figure 1. Table Lock Safety Bar

  5. Manually slide the cradle forward and prop it up. See Removing Cradle Assembly.

    Figure 2. Propping Up Cradle

  6. Using a 5/64 Allen wrench, loosen the set screw at the down link clevis.

    Figure 3. Down Link Clevis

  7. Remove the patient table bottom front cover.

    Figure 4. Patient Table Bottom Front Cover

    8. Notice Image
    • caution
    • Potential body injury and damage to a critical component of the patient table.
    • Falling of unsecured object.
    • When removing the plate that secures the cradle latch housing, hold the plate in place as the screws are removed. Failure to do so will result in the housing falling after it is no longer secured to the patient table.
  8. Remove four bolts securing the cradle latch housing and the cradle latch cover.

    Figure 5. Cradle Latch Housing Bolts

  9. Unfasten the cable end from the down link clevis (see Figure 3).
  10. Pull the cable out of the cradle latch block on the front of the patient table.

    Figure 6. Interlock Cable and Main Cradle Latch Cable Routing

    1 Front latch assembly
    2 Cable fastener location
  11. Add or remove brass shims on the replacement assembly to match the number of shims from the original assembly.

    Figure 7. Cradle latch assembly shims

  12. Remove the limit screw at the back of the cradle latch housing. Extract the plastic latching mechanism and replace.
  13. Insert the new cable through the head of the cradle latch block so after it is fully threaded, the swaged end fits into the hole in the latch pin.

    Figure 8. Installing Main Cradle Latch Cable

  14. Insert the cable into the sheath and feed the entire cable through the sheath.

    Figure 9. Cradle latch cable sheath

    1 Cable
    2 Sheath
  15. Slide the sheath along the cable into the plate, towards the front latch.

    Figure 10. Feeding the sheath into the plate

  16. Feed the cable and the sheath through the bushing located opposite of the plate.

    Figure 11. Cable and sheath bushing

  17. Reinstall the cradle latch housing.
  18. Before continuing, move the fine adjust screw all the way in (tight to the block).
  19. Rotate the three-legged casting by hand (or have a second person press the table pedal), and put a tool such as an Allen wrench in the mechanism to hold the table in the docked position.

    Figure 12. Tool Holding Table in Docked Position

  20. Route the cable through the cable casing and insert the cable through the down link clevis (see Figure 3).
  21. Loop the cable twice through the hole in the down link clevis.

    Figure 13. Cable Path through Down Link Clevis

  22. Pull the cable taut. Pull until the main latch is as low as it can go.
  23. Put Loctite on the set screw.
  24. Tighten the set screw (see Figure 3).
  25. Remove the tool used in Step 19.
  26. Use the pedal to cycle the cable movement 10 times.
  27. Use the fine adjust screw to readjust as needed.
  28. Return to the magnet room and dock the patient table.
  29. Adjust the cable so that when the table is docked, the main latch is flush with the casting. For details, see Cradle Release Block Adjustment.
  30. Loop the excess cable multiple times to bundle it.

    Figure 14. Bundling Excess Cabling

  31. Re-dock the patient table.

Finalization

  1. Raise the table lock safety bar.

  2. Verify proper operation of the latching interlock.

  3. Replace the cradle, and the upper bellows and lower base side cover.