Troubleshooting and Repairs
WARNING:
When removing the shaft from the pipette body, make sure
the spring, seal and o-ring do not fall off the piston, espe-
cially on the smaller models.
Sample Splash (liquid inside the mechanism)
1. Remove the tip ejector arm. Also refer to the appropriate
drawing on page 12 or 13.
2. On pipettes up to 1000 µL, unscrew the shaft coupling (B)
and remove the shaft (C). For 2000 µL, unscrew the shaft.
For 5000 µL, 10 mL and 20 mL unscrew the lower part
of the shaft. Note the way the spring, seal and O-ring fit on
the piston.
3. Inspect the seal assembly and piston for contamination.
The piston should be shiny and free of corrosion. Clean
with distilled water or isopropyl alcohol. Dry with a lint-
free tissue and reassemble after inspecting the interior of
the shaft for any contamination. For 5000 µL, 10 mL
and 20 mL models, apply a small amount of grease to
the seal.
4. If piston corrosion or staining is evident, do not use the
instrument. Call 800-662-7027 for Service.
Leaks, Inaccuracy, Abnormal Stroke
1. Loose shaft. Tighten coupling by hand.
2. Split or cracked shaft. Remove the tip ejector and
inspect the shaft. Replace the shaft if necessary. If the
shaft was dropped, remove it to see if the piston is bent.
If so, return the instrument for service.
3. Worn seal and / or o-ring. All models up to 2000 µL
incorporate a polyethylene seal and o-ring. Examine the
seal and o-ring, replacing them as necessary. Pull off the
old seal and o-ring, position the new seal and o-ring on
the piston assembly as shown in the drawings on pages
12-13, and reassemble the pipette.
Note: It is NOT necessary to recalibrate Pipet-Lite after
changing seals.
4. Do not lubricate any components*. Pipet-Lite uses a dry
sealing system. *Except 5000µL, 10 mL, and L-20ML
models. These pipettes require a small amount of grease
to be applied to the o-ring to make the seal.
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