Oregon Harvester Handbook page 53

Saw Chain Troubleshooting
17. Drive link tang turned up.
Cause: Worn drive sprocket .
Symptoms: Drive link tangs hit the bottom .
Remedy: Replace drive sprocket, sharpen
drive link tangs (as shown in Sharpening
Drive Link Tangs; see page 49) if
possible, or replace the saw chain .
18. Sides worn round or thin at bottoms.
Cause: Guide bar rails have spread, or one
rail has worn low, allowing saw chain to
lean over . Improper sharpening angles .
One side of saw chain dull . Use of .063"
gauge saw chain in .080" guide bar .
Symptoms: Saw chain cuts crookedly .
Accelerated guide bar rail and saw
chain wear .
Remedy: Ensure guide bar and saw chain
gauge match . Sharpen cutters frequently,
using recommended angles . Have guide
bar rails serviced by a dealer, or if possible,
dress guide bar rails square . If guide bar
groove is spread too wide, replace guide
bar . If saw chain wear is extensive, replace
the saw chain .
48
Mechanical Timber Harvesting Handbook