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11. MAINTENANCE OF SAW CHAIN AND GUIDE BAR
Guide Bar
• Reverse the bar occasionally to prevent partial wear.
• The bar rail should always be square. Check for wear of
the bar rail. Apply a ruler to the bar and the outside of
a cutter. If a gap is observed between them, the rail is
normal. Otherwise, the bar rail is worn. Such a bar needs
to be corrected or replaced.
Ruler
Gap
No gap
Chain tilts
