Control of Contamination
Maintaining hydraulic fluid within allowable contamination limits for both water and particulate matter is crucial to the care and protection of hydraulic equipment. Filters will provide adequate control of the particular contamination problem during all nor mal hydraulic system operations if the filtration system is installed properly and filter maintenance is performed regularly. Filter maintenance includes changing elements at proper intervals.
Control of the size and amount of contamination entering the system from any other source is the responsibility of the personnel who service and maintain the equipment. Dur ing installation, maintenance, and repair of hydraulic equipment, the retention of cleanli ness of the system is of paramount importance for subsequent satisfactory performance.
The following maintenance and servicing procedures should be adhered to at all times to provide proper contamination control:
1. All tools and the work area (workbenches and test equipment) should be kept in a clean, dirt-free condition.
2. A suitable container should always be provided to receive the hydraulic liquid that is spilled during component removal or disassembly.
Note: The reuse of drained hydraulic liquid is prohibited in most hydraulic systems. In some large-capacity systems the reuse of fluid is permitted. When liquid is drained from these systems for reuse, it must be stored in a clean and suitable container. The liquid must be strained and/or filtered when it is returned to the system reservoir.
3. Before hydraulic lines or fittings are disconnected, the affected area should be cleaned with an approved dry-cleaning solvent.
4. All hydraulic lines and fittings should be capped or plugged immediately after disconnection.
5. Before any hydraulic components are assembled, their parts should be washed with an approved dry-cleaning solvent.
6. After the parts have been cleaned in dry-cleaning solvent, they should be dried thoroughly with clean, low-lint cloths and lubricated with the recom mended preservative or hydraulic liquid before assembly.
Note: Only clean, low-lint type II or I cloth as appropriate should be used to wipe or dry component parts.
7. All packing 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.