Fresenius Medical Care 2008K Troubleshooting Manual page 219

UF- 3.0.2 OLD STYLE UF PUMP CHECK
Place the machine into Rinse program. Is the 'heavy spring' compressing and releasing?
Yes See procedure number
No See procedure number UF- 5.0.0 (page 218).
UF- 3.0.3 NEW STYLE UF PUMP CHECK
a) If the machine is in Rinse pull the red concentrate connector from its
rinse port to interrupt Rinse.
b) Leaving the UF pump plugged into the distribution board and its tubing
attached un-mount it from the hydraulics.
c) Referring to the Figure (right), turn the pump 180° so the 'heavy
spring' can be seen through the opening on the bottom.
d) IMPORTANT! Place the machine into Rinse program. Is the 'heavy
spring' compressing and releasing?
Yes See procedure number
No See procedure number UF- 5.0.0 (page 218).
UF- 4.0.0 CHECK UF PUMP (#22) MECHANICS (3)
a) Turn the machine off. Referring to
disassemble the UF pump (four checks): NOTE: Do NOT misplace
the small 'shim washers'.
1. Check for damaged (bent) OR disoriented 'weak' and
'strong' springs and/or bad seals.
2. Assure a strong spring is at the output (colored) nozzle;
a weak spring at input (white) nozzle.
3. Assure the retaining clip is placed in the slot so the 'heavy'
spring is at maximum compression.
4. Check the diaphragm piston, solenoid port and 'heavy'
spring. Replace the UF pump if corrosion or rust is located.
b) Attempt UF PUMP Calibration per Procedure. If the pump will not calibrate possibly the number of
factory installed 'shim washers' are incorrect or the UF pump is bad.
UF- 4.0.0 (page 217).
UF- 4.0.0 (page 217).
Figure 88 (page 217),
Figure 88 – UF Pump Exploded
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Section 14 – Ultrafiltration (UF) Pump Problems
Page 217