Jobsite CN-25, Original Instruction

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6. Adjust the position of chain tensioner nail, and then insert the tensioner nail in the
lower hole of the guide bar. Mount the clutch cover to the power unit, and while
Inserting the claw on the clutch cover into the groove on the power unit, and then
fasten the mounting nut to finger tightness. While holding up the tip of the bar, adjust
the chain tension by turning the tensioner screw until the tie straps just touch the
bottom side of the bar rail.
3. Tensioner nail
4. Tensioner screw
5. Hole
6. Claw
7. Groove
7. Tighten the nut securely with the bar tip held up (12 ~ 15 Nm). Then check the
chain for smooth rotation and proper tension while moving it by hand. If necessary,
readjust with the chain cover loose. (Figure 6)
Turn the tensioner screw clockwise
to tighten the chain, turn the
tensioner screw counter-clockwise
to loosen the chain.
8. Check the tension of the saw chain. Use your hand to
lift the chain link which positions on the middle of cutting
length up with approximate 10N force. If the chain link
goes out of the rail of guide bar entire, you need to
retighten the chain.
It is very important to maintain the proper chain tension.
Rapid wear of the guide bar or the chain coming off easily can be caused by
improper tension. Especially when using a new chain, take good care of it since it
should expand when first used. (Figure 7)