Stihl MSA 120 C Instruction Manual page 54

English
WARNING
Never use a dull or damaged chain. This leads to increased
physical strain, increased vibration load, unsatisfactory
cutting results and increased wear. If the chips from cutting
are fine, more like saw dust than wood chips, the chain likely
is dull.
► Switch off the chain saw, engage the chain brake and
remove the battery.
2
► Check the height of the depth gauge (1) with a STIHL file
gauge (2) matching the pitch of the chain.
► If the depth gauge protrudes higher than the file gauge,
file the depth gauge to the appropriate height.
► Work carefully. Do not file the depth gauge too low. A
depth gauge that is too low must be replaced or
sharpened by an authorized STIHL servicing dealer, as it
can increase the kickback tendency of the chain saw and
can increase kickback forces.
2
4
52
1
1
3
STIHL chain is manufactured with wear marks to help the
operator identify excessive wear. The wear marks depicted
above (1 - 4) must remain visible.
► Replace the chain if any wear marks are no longer visible.
► Check the 30° sharpening angle of the cutters with a
STIHL file gauge matching the pitch of the chain.
► If the sharpening angle is incorrect, file the cutters to a 30°
angle.
► If you are unable to achieve the proper angle, or suspect
you have not achieved the proper angle, have the chain
sharpened by an authorized STIHL servicing dealer.
An improperly filed chain can be very dangerous. It can
increase the potential for reactive forces, including kickback,
and also increase the magnitude of those reactive forces.
The chain pitch marking (a) is embossed in the area of the
depth gauge of each cutter.
The markings mean the following:
Marking (a)
1
2
3
4
6
7
24 Inspection and Maintenance
a
Saw Chain Pitch
1/4"
.325"
3/8"
.404"
3/8" PICCO
1/4" PICCO
0458-716-8621-E