Chapter 4: Maintenance 127
Figure 4-12 Lowering the plunger
9 Unscrew the syringe from the valve.
Grasp the metal ring at the top of the syringe and turn counterclockwise.
10 Discard the syringe into a biohazardous sharps container.
11 Install the new syringe (Figure 4-13 on page 128).
• Screw the syringe into the valve (see a in Figure 4-13).
Screw the syringe into the valve port until it contacts the seal washer,
and then turn the syringe an additional 1/6 to 1/4 turn. If leakage is
observed, tighten a maximum of an additional 1/8 turn.
• Pull down the syringe plunger until it meets the plunger drive (see b in
Figure 4-13).
• Tighten the plunger lock screw (see c in Figure 4-13 on page 128).
NOTICE Make sure the plunger lock screw is securely tightened.
plunger lock screw
plunger drive
valve
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