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Troubleshooting and Repairs
Pipetman pipettes provide exceptional performance and
long-term service. Use these procedures in case of phys-
ical or chemical damage.
Sample Splash
In case of suspected accidental entry of liquids into the
Pipetman mechanism:
1. Remove the tip ejector by pulling the plastic collar.
2. Unscrew the shaft coupling holding the shaft to the
pipette body.
3. Holding Pipetman upside down, remove the shaft
and inspect the seal assembly and piston for contam-
ination. Clean with distilled water or IPA if contami-
nant is still wet and corrosion is evident. Dry with a
lint-free tissue and reassemble after inspecting the
interior of the shaft for contaminant.
4. If staining and/or corrosion of the piston is evident
(due to previously dried sample material), do not use
the instrument. Return to Rainin for service.
Note: Never grease any Pipetman components
(with the exception of the grease seal on models
F-5001 to 10ML prior to serial number N05803D.)
Leaks, Inaccuracy, Abnormal Stroke
Possible causes:
1. Loosened shaft. Tighten coupling by hand.
2. Split or cracked shaft. Remove the tip ejector and
inspect the shaft for fracture or split end. Replace the
shaft if necessary. If the shaft was dropped, remove it
and the seal assembly to see if the piston is bent. If
so, return the instrument for service.
3. Ejector interferes with tips. If there is no gap be-
tween the tip and the end of the ejector arm, then the
tip ejector is loose. Refer to the photos for proper
repositioning of the ejector arm.
4. Worn seal and/or O-ring. Dismantle your Pipetman
as described in "Sample Splash". Replace the seal
and O-ring if necessary, referring to the appropriate
exploded view on pages 10-11.
5. All models have a polyethylene seal and rubber O-
ring. Replacement is easy – just pull off the old seal
and O-ring and position the new seal and O-ring on
the piston in the orientation shown in the exploded
view. Reassemble Pipetman-F.
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