Gilson 402 - Manual (Page 95)

6-11
Maintenance
6
Changing the Syringe Piston and Piston Noses
Changing the 25 mL Piston Noses
You don’t need a special tool for mounting the
piston nose on the 25 mL piston. The nose screw-
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. It may be
necessary to screw the piston securing screw back
into the bottom of the piston and pull on the screw
to remove the piston from the syringe barrel.
3. Hold the piston nose firmly in one hand and
unscrew the nose from the piston shaft.
4. Screw a new piston nose on the shaft.
5. Slide the piston into the syringe and complete
the piston nose fitting by screwing the shaft until
the piston nose turns with the piston shaft.
6. Remove the piston from the syringe and dip the
piston nose in distilled water and slide the piston
up and down in the syringe five or six times to
ensure a smooth operation between the piston
and syringe.
7. Remount the syringe on the pump as described
page 6-4.
Changing the 5 mL and 10 mL Piston
Noses
Part Number Description
F4015068 1 x 25 mL piston
nose.
Part Number Description
F4015003 5 mL piston nose
mounting kit.
F4015004 10 mL piston nose
mounting kit.
F4015066 1 x 5 mL piston
nose and O-ring.
F4015067 1 x 10 mL piston
nose and O-ring.
The piston nose mounting kits are composed of a
piston nose holder and a piston shaft holder.
1. Remove the syringe from the pump as described
page 6-4.
2. Slide the piston out of the syringe barrel. It may
be necessary to screw the piston securing screw
back into the bottom of the piston and pull on
the screw to remove the piston from the syringe
barrel.
3. Remove the piston nose from the shaft by care-
fully pinching the piston nose with a pair of
cutters and gently pulling the piston nose off the
shaft. Take care not to damage the end of the
shaft when removing the piston nose.
4. Remove any remaining debris of the original
piston nose from the end of the shaft.