Gilson GX-271 - Page 85

Gilson GX-271 Liquid Handler User’s Guide 4-11
Maintenance 4
Replacing Parts
Piston Seal for 500 μL Syringe
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 Turn the tool upside down and place the piston assembly as shown in the figure on the
left.
7 Slacken the piston button and remove it from the piston rod. Slide the clamping tool
down the piston rod and press the two tools firmly against each other. A slight rotation
of the clamping tool ensures a correct fitting.
8 Remove the tools away from the piston assembly.
9 Dip the piston seal in distilled water and slide the piston into the syringe.
10 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).
11 Slide the piston button against the body of the syringe and tighten the Allen screw that secures the piston button onto the
piston rod.
12 Slide the piston up and down in the syringe five or six times to ensure a smooth operation between the piston and syringe.
13 Make sure of the presence of the plastic cover when re-mounting the syringe on the pump.
14 Remount the syringe on the pump as described on page 4-4
.
piston
clamping
piston
piston seal holding tool
rod
tool
seal
Figure 4-9: 500 μL Syringe