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Replacing the Piston Seal Assembly
Alignment Pins
Pump Head
Piston Seal
Assembly
Replacement of the Piston Seal Assembly is recommended every six
months. Using the open end wrench (provided) remove the 1/16" transfer
tube which connects the output of the pump head to the purge valve
body (Figure 1).
Using the 9/64" Allen wrench (provided) loosen and remove the 4 Allen
screws which connect the pump head to the manifold and spring
housing. Loosen these screws evenly. Remove and pull the pump head
away from the pump, alignment pins, and manifold. This step will expose
the two piston seal assemblies (Figure 11). The seals may be grasped
with the fingertips and gently pulled forward and free of the ceramic
piston. Use care when pulling these seals off to avoid scratching of the
ceramic piston.
Figure 11 Piston Seal Assembly Replacement
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Pump Head Manifold
Piston Seal Assembly
Allen Screws (4)
Allen 9/64" Wrench
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