Maintenance
4
4-12 Gilson GX-271 Liquid Handler User’s Guide
Replacing Parts
Piston Seal for 1 mL Syringes
1 Remove the syringe from the pump as described on page 4-3.
2 Slide the piston out of the syringe barrel.
3 Remove the piston seal from the piston rod by carefully pinching the piston seal with
a pair of pliers and gently pulling the piston seal off the piston rod. Take care not to
damage the end of the piston rod when removing the piston seal.
4 Remove any remaining debris of the original seal from the end of the piston rod.
5 Put the new piston seal in its recess in the piston seal holding tool.
6 Holding the piston rod firmly, gently push the end of the piston rod into the new piston
seal until the rod is clamped in the piston seal.
7 Remove the piston assembly from the holding tool.
8 Dip the piston seal in distilled water and slide the piston into the syringe.
9 Hold the syringe upright with the threaded end of the syringe resting on a flat, clean
surface. Slide the piston into the syringe until the piston stops (the seal is level with the
end of the syringe).
10 Slide the piston button against the body of the syringe and tighten the Allen screw that
secures the piston button onto the piston rod.
11 Slide the piston up and down in the syringe five or six times to ensure a smooth
operation between the piston and syringe.
12 Remount the syringe on the pump as described on page 4-4
.
Piston Seal for 5 mL and 10 mL Syringes
1 Remove the syringe from the pump as described on page 4-3.
2 Slide the piston out of the syringe barrel.
3 Remove the piston seal from the shaft by carefully pinching the piston seal with a pair of pliers and gently pulling the piston
seal off the shaft. Take care not to damage the end of the shaft when removing the piston seal.
4 Remove any remaining debris of the original piston seal from the end of the shaft.
5 Insert the new piston seal in the recess of the piston seal holder. Make sure that the aperture is facing outward and the
O-ring is inside the seal.
6 Place the piston shaft in the piston shaft holder, see diagram below.
7 Screw the two parts of the tool together until tight.
8 Unscrew the tool, the piston seal
should be correctly seated on the
shaft.
9 Dip the piston seal in distilled water
and slide the piston into the syringe.
10 Slide the piston up and down in the
syringe five or six times to ensure a
smooth operation between the piston
and syringe.
11 Remount the syringe on the pump as
described on page 4-4
.
piston
piston
piston
seal
holding
tool
seal
rod
Figure 4-10: 1 mL Syringe
O-ring piston seal
piston seal holder piston shaft piston shaft holder
Figure 4-11: 5 mL and 10 mL Syringes
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