Front end bell removal and installation

Prerequisites

Table 1 Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
2	Not Applicable	1.5 hours	Not Applicable

Table 2 Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Nonmagnetic Titanium Service Tool Kit, Large Set	-	-	5112581	-

Table 3 Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Front End Bell Assembly	1	-	See FRU Manual	-

Table 4 Safety

Strong Magnetic Field!
Ferrous materials can become dangerous projectiles in the presence of the magnetic field Produced by the Magnet.
Do not Bring any ferromagnetic tools or equipment into the magnet room.

Perform LOTO on the PDU. See the MR Service Safety Manual, PN 5452735.
Remove the bridge cover.
Remove the bridge assembly. See Bridge and Longitudinal Drive Belt Replacement.

Figure 1. Front end bell
For systems without an IRD, remove the front trim ring by pulling it away from the enclosure. There are no bolts holding it in place.

Figure 2. Remove trim ring

For systems with an IRD, remove the laser light cover, which is held on with 2 screws and a popper. The IRD has 2 front trim rings.

Figure 3. IRD laser light cover
Remove the six M10 bolts holding the front end bell to the turtle bracket.

Figure 4. Front end bell bolt locations
Remove the front body coil bias cable(s) and the body coil ID cable.
notice: The front end bell is heavy. Avoid awkward body positioning. Use proper lifting techniques when moving the front end bell.
Remove the end bell.

note: Take care when removing or installing the end bell. Do NOT touch or move the body coil. Body coil tuning is dependent on body coil location.
Reverse the steps to install the replacement front end bell. Confirm the gap between the front end bell and the RF body coil is 2.5 +/- 0.5 mm with a desired gap of 2.0 mm. Verify the proper fit of the covers.

If the gap measurement is outside the desired range, see RF Body Coil Replacement.