Oil Filter Service; Figure 5: Filter Assembly - Siemens GAS-Guard 8 Operation And Maintenance Manual

810-1734-00 Rev A

Oil Filter Service

The GAS-Guard uses two inline screen type oil filters. Under normal operation, no filter maintenance is
required. If service is require, the filter consist of three main parts: the filter housing, filter screen and
the filter cap. For filter service proceed as follows:
1) Turn off power to the GAS-Guard by opening the GAS-Guard door and toggling the power
switch located in the upper right hand corner to the OFF position.
2) Loosen the filter cap while supporting the filter housing with an adjustable end wrench. The
exact filter location will vary by installation.
3) After loosening the filter cap slowly back off the cap until transformer oil starts flowing out
the purge hole located on the side of the filter cap.
4) Let the oil continue to flow until a clear stream of oil void of any contaminates is visible.
5) Tighten filter cap.
6) Turn on power to GAS-Guard.
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Figure 5: Filter assembly