Oregon CHAINSAW Maintenance And Safety Manual page 57

SAW-CHAIN TROUBLESHOOTING (CONTINUED)
REMEDIES: (continued)
M. Sprocket has worn out of pitch, replace it. Replace chain. Do not
attempt to run a new chain on an old sprocket, or an old chain on
a new sprocket. (picture 20, previous page)
N. Drive sprocket has worn down until drive link tangs hit bottom.
Replace drive sprocket. Sharpen drive-link tangs as shown in the
illustration below, if possible. If not, replace the chain. (picture
21,
previous page )
O. Remove damage from sides of drive links with a flat file. Sharpen
drive-link tangs as shown in the illustration below. Use a thin file to
open the groove lead-in at the guide-bar's tail. (picture 22,
previous page)
P. Bar rails have spread, or one rail has worn low, allowing chain to
lean over. Have bar rails serviced by a dealer, otherwise replace
bar. Replace chain if wear is extensive or if problem persists.
(picture 23, previous page)
NOTE: Also check bottoms of tie straps (see picture 16, page 51),
and tops of bar rails (see picture 33, page 63).
SHARPENING DRIVE-LINK TANGS
Pointed drive-link tangs help remove chips and debris from your bar groove.
Sharpen damaged tangs back to original shape with a round file.
SAW CHAIN
SAW CHAIN SAW CHAIN
53.