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10.2. In-house maintenance
1. Hold down the tip ejector.
2. Place the tooth of the opening tool between
the tip ejector and the tip ejector collar to
release the locking mechanism.
3. Carefully release the tip ejector and remove
the tip ejector collar.
4. Place the wrench end of the opening tool
over the tip cone, turning it anticlockwise. Do
not use any other tools. The 5 ml tip cone is
removed by turning it anticlockwise without
any tools.
5. Remove the tip cone, piston, and spring.
Remove the filter if fitted.
6. Clean the tip ejector collar, the tip cone
holder, the tip cone (cylinder) and the piston
with ethanol (70%), isopropanol (60%) or mild
detergent and soft lint-free cloth.
7. Clean the interior of the tip ejector collar and
the tip cone (cylinder) with a cotton swab.
8. Before replacing the tip cone it is
recommended to grease the piston and
O-ring slightly by using the silicone grease
provided.
9. After reassembling press the operating
button several times to ensure that the grease
has spread evenly.
10. Check the pipette calibration.
NOTE: On models 720010, 720015, 722001 and
722004 (10 µl pipettes) the O-ring cannot be
accessed for maintenance.
NOTE: Excessive use of grease may jam the piston.
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