Gilson 402 - Manual (Page 94)

6-10
Maintenance
6
Changing the Piston Syringes and Piston Noses
Before Mounting a 500 µL Syringe: To optimize
the fitting of the 500 µL syringe on the Dilutor
valve, the 500 µL syringe is supplied with a cover
seal. The orientation of this seal must be respected
to ensure that the connection with the syringe is
airtight. (See the opposite figure).
Changing the 1 mL Piston Noses
You need the special tool for mounting the piston
nose on the 1 mL piston. The nose push-fits onto
the piston shaft.
1. Remove the syringe from the pump as described
page 6-4.
2. Slide the piston out of the syringe barrel.
3. Remove the piston nose from the piston rod by
carefully pinching the piston nose with a pair of
cutters and gently pulling the piston nose off the
piston rod. Take care not to damage the end of
the piston rod when removing the piston nose.
4. Remove any remaining debris of the original
nose from the end of the piston rod.
5. Put the new piston nose in its recess in the
piston nose holding tool.
6. Turn the tool upside down and place the piston
assembly.
7. Press the piston shaft firmly into the piston nose
holding tool. A slight rotation of the piston shaft
ensures a correct fitting.
8. Slacken the piston button Allen screw and
remove the piston button from the piston rod.
9. Remove the tool from the piston assembly.
10. Dip the piston nose in distilled water and slide
the piston into the syringe.
11. 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 nose is level with the end of the syringe).
12. Slide the piston button against the body of the
syringe and tighten the Allen screw that secures
the piston button onto the piston rod.
13. Slide the piston up and down in the syringe five
or six times to ensure a smooth operation be-
tween the piston and syringe.
14. Remount the syringe on the pump as described
page 6-4.
Cover seal
Valve screw
Syringe body
Part Number Description
F4015065 5 x 1 mL piston
noses and
mounting tool.
F4015005 1 nose mounting
tool.
Piston rod
Piston nose
Piston nose
holding tool