4-1
Chapter 4
Maintenance
Introduction
The P3800 Series of High Pressure Deadweight Testers have been designed to require
minimal maintenance.
Routine maintenance entails keeping the unit clean and free from excess oil.
The operating fluid should be changed at regular intervals due to potential contamination
from items under test. As soon as discoloration of the fluid is observed it should be
replaced as soon as possible.
W
Warning
If fluid contacts the skin, a mild allergic reaction may result.
Wash at once with soap and water.
Should the PCU require inspection or cleaning, great care must be taken whilst handling
the components.
PCU Removal
Before removal of the PCU, the system pressure must be reduced to zero as described
above.
1.
Carefully lift off Weight Carrier Tube Assembly.
2.
Unscrew Piston Nut B, and lift out Piston —
take great care not to apply any
side-loads to the piston to avoid possible breakage
.
3.
Unscrew Piston Nut A, taking great care not to drop Cylinder, as it may be inside the
assembly.
Note
The Piston Nut A contains a bearing assembly, which is held in place by a
snap-ring. This should not normally require any maintenance or additional
lubrication.
4.
Remove Cylinder.
5.
The O Ring Seal under the PCU can now be replaced if required.
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