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Push the new piston seal assembly over the end of the exposed ceramic
piston with the fingertip or thumb, but do not allow your fingernails to
contact the seal as damage may occur. This procedure aligns the piston
seal assembly on the ceramic piston. It is normal for the seal not to push
completely over the end of the ceramic piston. If the seal is pushed out of
the housing during this operation, place the piston seal assembly, seal
down, on a clean surface and press down to pop the seal back into the
housing. Press the seal assemblies partially on the ends of the ceramic
piston rods as far as possible without popping the seals out of the
housings.
Carefully install the pump head on the manifold using the two alignment
pins for guidance. When the pump head is pressed firmly against the
manifold, the seals will be pressed over the ceramic pistons. To avoid
scratching the ceramic piston, do not allow the pump head to contact the
ceramic piston.
Replace the pump head with the Allen screws and use the 9/64" Allen
wrench to tighten the screws. The screws should be tightened evenly to
avoid excess loads. Tighten the upper left screw followed by the lower
right screw until a metal to metal seal is achieved. This procedure will
compress the PEEK seal housing slightly. Use of the Allen wrench will
provide the necessary torque to ensure the screws are fully tightened.
Reconnect the 1/16" transfer tube.
Replacing the Wash Seal Assembly
Inspect the Wash Seal Assembly every six months. If the pump has a
wash seal option installed, it may be necessary to inspect and/or replace
these seals periodically. See Installation the Piston Wash Seals on
page 8. Each wash seal assembly (wash seal and PEEK housing) is
installed on the ceramic piston shaft and contained by a recess on the
rear side of the manifold similar to the piston seal assembly.
The wash seal assemblies can be inspected, changed, or installed by
removing the pump head and the piston seal assemblies described in the
previous section. After the piston seal assemblies are removed, remove
the 1/4-28 finger tight fittings from the manifold and pull the manifold
away from the spring housing and alignment pins until it is free (Figure 5
and Figure 12). At this stage, the ceramic piston, piston shaft and the
face of the spring housing are exposed. Normally the wash seal
assemblies will be retained on the ceramic piston shaft. Remove the
wash seal assembly from the piston shaft and clean the piston shaft if
necessary. Depending on the condition of the wash seal assemblies,
either clean by sonication or replace.
Replace the wash seal assembly by pushing the wash seal assembly
onto the end of the ceramic piston against the face of the spring housing.
Replace the manifold by correctly orienting it with the alignment pins (the
pins are asymmetrical) on the spring housing. When pushed forward
toward the spring housing, the manifold will contact the face of the spring
housing and the wash seal assemblies will be seated properly. Install the
piston seal assemblies and pump head following the instructions in the
previous section.
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