6-6
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56 Hudson St., Northborough, MA 01532 Ph: (508) 393-0155 Fax: (508) 393-5476
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Caution: To prevent injury, be sure to secure the plunger at all times during this procedure to
prevent it from ejecting from the pump head.
6.
Use the plunger insertion tool to compress the plunger spring with one hand. With the
other hand, use the snap-ring pliers to remove the snap-ring that holds the plunger in place.
7.
Remove the plunger assembly (Figure 6-5) and set it on a clean flat surface.
Figure 6-5 Removing the Plunger Assembly
Cleaning the Plunger
Buffers and impurities in eluants can coat the plunger and reduce the life of the seal. Cleaning the
pump plunger periodically can prolong the life of the seal. Clean the plunger with a fine pumice
or clear abrasive toothpaste. Rinse the plunger thoroughly with water or methanol to remove all
traces of the abrasive.
The parts of the plunger assembly are shown in Figure 6-6.
Figure 6-6 Disassembled Plunger
Inspecting the Plunger
After you clean the plunger, inspect it for damage by holding it under a bright white light and
looking down its length for nicks and scratches. It is easier to see scratches under a bright light
than to feel them with your fingers.
If the plunger is not scratched or otherwise damaged, reassemble the plunger. If the pump was
leaking, install new pump seals. If the plunger is damaged, replace the plunger and the seals.
Plunger
Snap-ring
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