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OPERATION PARAMETER RECOMMENDATIONS
EN
CHAIN TENSION
WARNING: Do not exceed recommendations, doing so will shorten the life of the chain and the cutting system's operation.
Recommended force applied to guide bar:
• .404" Pitch Chain = 110 lbs. (490 N)
• 3/4" Pitch Chain = 150 lbs. (668 N)
MANUAL TENSIONING SYSTEM
• Check tension regularly with manual tensioning systems.
• To Determine proper tension, a saw chain should be tight enough to pull the chassis of the chain firmly against the guide bar.
• CAUTION: Check your saw chain tension periodically during use.
• WARNING: only tension chain when cool; tensioning chain when hot may cause damage to your saw chain, guide bar, or saw motor.
• Relieving saw chain tension during breaks in cutting and shut down will aid in preventing damage to the cutting system.
CHECKING TENSION
In order to properly check tension, first grasp the saw chain near middle of guide bar. Then pull the saw chain away from the
guide rails.
• For correct tension the saw chain chassis should come out of the bar groove roughly 1/8" (3mm) and once released it should
snap back into the bar rails.
AUTOMATIC TENSIONING SYSTEM
Automatic tensioning systems are the precise and easy means to keep appropriate saw chain tension, especially if it automatically
compensates for the speed. High speed will create friction and heat causing the saw chain to lengthen and loosen tension.
Heat and cold will change your chain length. A moving chain will lengthen while a chain at rest will shrink. Automatic tension systems
can be calibrated to respond to the changing length by moving your bar forwards or backwards as needed to tighten or loosen tension.
WARNING: Improper tension is hazardous to the cutting system and user. If the tension is too loose the chain will become loose and
may result in a thrown chain. If the tension is too tight it will create extensive wear and damage the cutting system.
Refer to the technical tables of this manual, for recommended tension.
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