3-18 Maintenance
9. Insert the new plunger into the actuator piston, and tighten the
plunger-retaining nut with a 5/8-inch open-end wrench. Be careful not to
damage the plunger when sliding the open-end wrench over it.
10. Align the new plunger so that it points straight out from the piston, to
make it easier to install the pump head without damaging the plunger.
Reinstalling the pump head
To reinstall the pump head:
1. Lubricate the plunger seals (inside the pump head) with methanol just
before reinstalling the pump head.
2. Orient the pump head so that the inlet check valve is on the bottom.
3. Carefully align the pump head with the plunger, and gently push the
pump head onto the plunger, until the four screw holes align with the
holes in the support plate.
4. While supporting the weight of the pump head, use the T27 TORX driver
to tighten the four screws in the support plate 1/8 of a turn beyond
finger-tight.
5. Reattach the two seal-wash tubes to their fittings at the sides of the
pump head. Make sure the ferrules are in place.
6. Connect the solvent inlet tube to the inlet check valve on the bottom of
the pump head.
7. Reconnect the transducer outlet tube to the manifold, using a 5/16-inch
open-end wrench. The outlet is the top port on the side of the manifold.
4
Wave washers (3)
5
Plunger retaining nut
Caution: To avoid damaging the plunger, keep the pump head
aligned with the plunger when performing the next step. Also,
ensure the plunger is in the retracted state.
Key (Continued)
Number Name
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