Fresenius Medical Care 2008 Series User manual

REBUILD INSTRUCTIONS FOR BLOOD PUMP WITH
REMOVABLE TACHOMETER
P/N 490351 Rev. A Page 1 of 6
1. PURPOSE:
To outline the process of removing and reinstalling the tachometer assembly in order to access the
motor brushes on a 2008®Series Arterial Blood Pump with a removable tachometer.
2. TOOLS REQUIRED:
•T-20 Torx Screw Driver
•T-25 Torx Screw Driver
•#2 Phillips Screw Driver
•Marking Pen
3. PROCEDURE:
Caution: Care must be taken when handling circuit boards to prevent damage by ESD
(Electrostatic Discharge). Use appropriate ESD precautions when handling electronic
components.
Blood Pump Preparation
1. Remove the module from the machine; unplug the module ribbon cable(s) from the LP955
and the ESD ground wire from the module face plate.
2. Lay the module face down on an ESD protective surface.
Removable Tachometer Identification
In order to rebuild a 2008®Series Arterial Blood Pump, the tachometer has to be the removable type.
Figure 1 shows how to make the distinction between the two types. If the tachometer is not
removable, the blood pump motor cannot be rebuilt.
Non-Removable Tachometer Removable Tachometer
(Brushes Not Replaceable) (Brushes Replaceable)
Figure 1
Note: A non-removable tachometer blood pump can be converted by replacing the
motor/gearbox assembly with P/N M49706.
A Hood with only
one screw is not a
removable type.
A Hood with
two screws is a
removable type

REBUILD INSTRUCTIONS FOR BLOOD PUMP WITH
REMOVABLE TACHOMETER
P/N 490351 Rev. A Page 2 of 6
Tachometer Assembly Part Identification
Tachometer Assembly Removal
3. Using a T-20 Torx Screw Driver, remove the two screws holding the Hood and Base Plate to
the motor housing (Figure 2)
Figure 2
4. Once the screws have been removed, both the Hood and the Base Plate can be removed.
Caution: The Decoder Wheel is very delicate and can be easily damaged. In the next
step, use care when removing it from the motor shaft. Grease, dust and finger pressure on
the Decoder Wheel must be prevented.
5. Remove the Decoder Wheel from the motor shaft by pulling straight up (Figure 3).
Figure 3
6. Set the Decoder Wheel aside so that it does not get damaged or contaminated.
Decoder Wheel
Base Plate
Hood
Screws

REBUILD INSTRUCTIONS FOR BLOOD PUMP WITH
REMOVABLE TACHOMETER
P/N 490351 Rev. A Page 3 of 6
Motor Brush Replacement Preparation
7. Using a marker, make marks on the motor housing and motor end caps (Figure 4). These
marks will ensure the correct alignment when reassembling the motor case.
Figure 4 - Motor/Gearbox Assembly with marks.
8. Using a T-25 Torx Screw Driver, remove the two screws holding the motor cap to the motor
housing.
9. Remove the motor cap to gain access to the motor brushes.
10. Once complete, reassemble the motor, aligning the marks.
11. While holding the pieces together, install and tighten the two T-25 screws.
Note: If the motor case and motor cap are not installed using the marks, the motor will
run in reverse and errors will result.
Tachometer Assembly Installation
Caution: The Decoder Wheel is very delicate and can be easily damaged. In the next
step, use care when removing it from the motor shaft. Grease, dust and finger pressure on
the Decoder Wheel must be prevented.
12. One of the “leg” of the Base Plate has been designed to be used as a thickness gauge. In
preparation for the next step, place the “leg” against the motor shaft as shown in Figure 5.
Figure 5

REBUILD INSTRUCTIONS FOR BLOOD PUMP WITH
REMOVABLE TACHOMETER
P/N 490351 Rev. A Page 4 of 6
13. Slide the Decode Wheel on the motor shaft until it touches the Base Plate “leg” (Figure 6).
Figure 6
Note: Prior to installing the Base Plate, be aware of the small alignment post on its
underside. It fits into one of the holes in the motor end plate to assist in aligning the Base
Plate for mounting (see the arrow in Figure 7).
Figure 7
14. Once the Decoder Wheel is in place, carefully position the Base Plate so the Decoder Wheel is
positioned in the gap of the sensor (Figure 8). The Decoder Wheel should not touch the
sensor when the motor shaft is turned.
Figure 8

REBUILD INSTRUCTIONS FOR BLOOD PUMP WITH
REMOVABLE TACHOMETER
P/N 490351 Rev. A Page 5 of 6
15. The Base Plate is properly positioned when the decoder wires are aligned with the motor
wires (see arrow in Figure 9).
Figure 9
16. Place the Hood onto the Base Plate and align the mounting holes with the threaded screw
holes in the motor end plate. Ensure the alignment pin on the underside of the Base Plate is
inserted into its hole in the motor end plate (Figure 10).
Figure 10
17. Once aligned, install and tighten the two T-20 screws removed in step 3 to secure the Hood
and Base Plate (Figure 11). Do not over tighten the screws.
Figure 11

REBUILD INSTRUCTIONS FOR BLOOD PUMP WITH
REMOVABLE TACHOMETER
P/N 490351 Rev. A Page 6 of 6
Post Reassembly Testing
18. Reconnect the ribbon cable(s) and the ESD ground wire to the blood pump module and install
it into a machine.
19. Turn the machine on and place the machine into Dialysis Mode.
20. Clear all blood alarms and start the blood pump if it is not already running by pressing the
Start/Stop key on the blood pump.
21. Verify no alarms or error codes displayed on the blood pump.
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