Object ID: 00000018WIA3061AA50GYZ
Topic ID: id_2026851 Version: 1.1
Date: Jun 22, 2020 11:41:03 AM

Replacing the reciprocating pump assembly

Prerequisites


Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	-	60 minutes	-


Tools and test equipment
Item	Quantity	Part number	Manufacturer
Clamp	1	-	-
3/4 inch Open-End Wrench	1	-	-
Needle-Nose Pliers	1	-	-


Consumables
Item	Quantity	Part number	Manufacturer
Absorbent Towels	As needed	-	-

There are two types of Reciprocating Pump Assemblies depending on the weight rating of the table. The GEM flat table requires the High Pressure Reciprocating Pump, while all curved tables use the Standard Reciprocating Pump.
Replacement parts
Item	Quantity	Part number	Manufacturer
Reciprocating Pump Assembly	1	See FRU manual.	-
High Pressure Reciprocating Pump Assembly	1	See FRU manual.	-


Safety
Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must: Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735). Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses). Comply with all site-specific training and workplace safety requirements. If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

Removing the reciprocating pump assembly

About this task

There are two types of Reciprocating Pump Assemblies depending on the weight rating of the table. The GEM flat table requires the High Pressure Reciprocating Pump, while all curved tables use the Standard Reciprocating Pump.

Procedure

Undock the patient table and remove it from the magnet room.
Remove the upper and lower base covers, referring to Patient Table Upper and Lower Base Cover Removal .
Raise the patient table to the full up position.

Warning

Personal injury possibility

When doing maintenance on the table in its up position, severe personal injury can occur if the table is accidentally lowered during maintenance.

Make sure the lock safety bar is safely in place.

Lower the table lock safety bar.

Release the hydraulic pressure by gently pressing the Down foot pedal until the table is supported by lock safety latch. Refer to Patient Table Hydraulics Bleeding for details.
Place absorbent towels under the reciprocating pump area, and clamp the hydraulic oil line shown below.
Use a 3/4 inch open-end wrench to disconnect the hydraulic oil hose connection from the pump.
1. Fasten the end of the hose in an upright position to prevent oil from leaking.
2. With the open-end wrench, disconnect both black high-pressure hoses from the top and side of the pump.
  
  Figure 2. Left side view of lower table chassis
Remove the clip and pin from the front of the pump, then remove them from the rear of the pump.
Slide pump assembly away from the table chassis and remove it.

Figure 3. Front and rear clips, pin and shaft

Installing the reciprocating pump assembly

Procedure

Slide the new pump assembly onto the front pin and rear shaft, and replace the clips on both ends.
Using a 3/4 inch open-end wrench, reconnect both black high-pressure hoses to the top and side of the pump.
Reconnect hydraulic oil line to the pump with the open-end wrench.
Remove the clamp from the hydraulic oil line.
Raise the table lock safety bar to its upright position, and lower the patient table.
Use the Up foot pedal to raise the table to the full up position. Lower table and repeat this process to allow the hydraulic oil to circulate within the pump.
If necessary, add hydraulic oil to the reservoir so it is 1/4 to 1/2 in. (6.5 to 12.5 mm) above the fluid level line (shown below) when the table is at its lowest position.

Figure 4. Hydraulic fluid reservoir
Perform Patient Table Hydraulic Cylinder Bleeding .
Pump the table up, counting the number of pumps it takes to raise the table. (The baseline number is 15, ± one pump.)
Replace the upper and lower base covers.
Return the table to the Magnet Room, and redock the patient table.