1/5 
One fifth of file diameter remains above cutter edge
Depth gauge tool
Remove until flat with tool
Round off the edge
•Place the depth gauge tool firmly on guide bar so that depth gauge protrudes.
Then file top of depth gauge with the flat file until flat with top of the depth gauge tool.
-Be sure to round off the front edge of the depth gauge.
| 20LPX, 20BPX: 85° |
| 72LPX, 72LGX: 60° |
20LPX, 20BPX: 30° |
|
72LPX, 72LGX: 25° |
|
Top plate filing angle | Side plate angle |
60° | 0.64 mm (0.025 in.) | |
|
| |
Top plate cutting angle | Depth gauge | Parallel |
|
| 28 |
Properly filed cutters are shown in illustration.
When setting of the chain is finished, soak it in oil and wash away filings completely before using.
-When chain has been filed on the bar, supply sufficient oil to it, rotate the chain slowly to wash away the filings before using again.
-If the chain saw is operated with filings clogged in the groove, the saw chain and the guide bar will be damaged prematurely.
-If the saw chain becomes soiled with resin, for instance, clean it with kerosene and soak in it oil.
NOTE
These angles are referred to as Oregon 20LPX, 20BPX or 72LPX, 72LGX.
To sharpen other follow chain manufacturer’s instruction.