As an aid to exercising contamination control, the
following maintenance and servicing procedures should
be adhered to at all times:
1. Maintain all tools and the work area (work-
benches and test equipment) in a clean, dirt-free
2. A suitable container should always be provided
to receive the hydraulic fluid which is spilled during
component removal or disassembly procedures.
NOTE: The reuse of hydraulic fluid is not
recommended; however, in some large-capacity
systems, the reuse of fluid is permitted. When liquid is
drained from the latter systems, it must be stored in a
clean and suitable container. This liquid must be strained
and/or filtered as it is returned to the system reservoir.
3. Before disconnecting hydraulic lines or fittings,
clean the affected area with an approved dry-cleaning
4. All hydraulic lines and fittings should be capped
or plugged immediately after disconnecting.
5. Before assembly of any hydraulic components,
wash all parts with an approved dry-cleaning solvent.
6. After cleaning parts in dry-cleaning solvent, dry
the parts thoroughly and lubricate them with the
recommended preservative or hydraulic liquid before
NOTE: Use only clean, lint-free cloths to wipe or
dry component parts.
7. All packings and gaskets should be replaced
during the assembly procedures.
8. All parts should be connected with care to avoid
stripping metal slivers from threaded areas. All fittings
and lines should be installed and torqued according to
applicable technical instructions.
9. All hydraulic servicing equipment should be
kept clean and in good operating condition.
Figure 10-37.One example of a hydraulic liquid contamination test kit.