Chapter 6: Pump Syringe Replacement 33
Replacing the Syringe
1 Loosen the plunger lock screw (indicated in the following figure)
approximately three full turns.
2 Lower the plunger drive by pushing the plunger lock screw down.
3 Unscrew the syringe barrel and remove it from the lower part of the valve.
Grasp the metal ring at the top of the syringe and turn counterclockwise.
4 Discard the used syringe into a biohazard sharps container.
5 Install the new syringe:
a Screw the syringe barrel onto the valve until it contacts the seal washer,
then turn the syringe an additional 1/6 to 1/4 turn. If you observe a
leak, tighten a maximum of an additional 1/8 turn.
b Pull the syringe plunger down to the plunger holder (see the following
figure).
Plunger lock screw
Valve
Syringe barrel
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