Mechanical Timber Harvesting Handbook
10
Operational Recommendations
Manual Tensioning Systems
• Saw chain should be tight enough to pull the chassis of the
saw chain firmly against the perimeter of the guide bar.
• Tension needs to be checked regularly.
• Only tension saw chain when it is cool. Steel expands
when hot and contracts as it cools. As a result, it could
cause damage to your guide bar or saw motor if tensioned
when hot.
• At shut down or breaks, relieve saw chain tension to prevent
damage to the cutting system (saw motor, bar tip, saw chain
chassis) as the saw chain cools and contracts.
• In cold weather, maintain proper tension. Check tension often
with manual tensioning systems.
Checking Tension
To check for proper tension, grasp the saw chain at the mid-span
of the guide bar and pull the saw chain away from the bar rails.
• For hard nose guide bars, the drive link tangs should nearly
come out of the bar groove.
• For sprocket nose guide bars, the saw chain chassis
should come out of the bar groove/away from the bar
rails approximately 1/8 inch ( approximately 3 mm). When
released, the chassis should snap back against the bar rails.
1/8"
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