Saw Chain
Mechanical Timber Harvesting Handbook
48
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.
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