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P3000 Series
Users Manual
Piston Re-Assembly
Replacement PCU Assembly
5-2
1.800.561.8187
Never touch the working surface of a clean piston with bare
fingers — the natural oil in your skin can cause the piston and
cylinder to stick.
8. Wipe any dirt or moisture from the outside surfaces of the cylinder (2).
9. Roll a NEW tissue into a tapered rod of appropriate size. Force the tissue through the
cylinder bore while rotating. Ensure that the tissue is a tight fit inside the bore so that
dirt and contamination is removed.
10. Repeat step 9 using a NEW tissue but from the opposite end of the cylinder.
11. Immerse the cylinder in a suitable, clean solvent, see note in step 5 above.
12. After removal from the solvent, using a NEW tissue, repeat the cleaning procedure in
step 9 and 10.
13. Holding the piston by the larger "head" end, carefully introduce the piston into the
underside of the cylinder, and push gently through (the piston will normally slide
freely through due to its own weight).
Never force the piston into its cylinder or damage will result. If resistance
continues, re-clean piston, cylinder, or both. If, after repeated cleaning, the piston still
will not slide freely within the cylinder, then permanent damage may have occurred.
In which case, the parts should be returned to the factory for evaluation or
replacement.
14. Stand assembly upright on a clean, hard, stable surface, ensure that the weight
carrier (1) is clean (especially the central mounting hole), and place on the tapered
end of the piston. Tap lightly using the palm of the hand to locate on the taper.
15. Carefully screw the assembly into the instrument, ensuring that the seal (6) is clean
and undamaged, and correctly re-fitted.
The piston and cylinder assembly is a matched pair, which is
calibrated and adjusted to a calculated mass figure. If, for any
reason, the piston or cylinder becomes damaged, then the
entire assembly must be replaced.
The replacement assembly consists of the following components: Item numbers
1 through 3.
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