Tensioning The Chain; Lubricating The Saw Chain And Guide Bar - Stihl HTA 66 Instruction Manual

14 Assembling the Pole Pruner
► Remove the chain sprocket cover.
► Turn the side chain tensioner counterclockwise until it
stops and the chain is loose.
► Remove the guide bar and chain.
NOTICE
The top and bottom of the guide bar are symmetrical, and
the bar may be mounted with the printing facing up or down.
Flipping the guide bar each time the chain is sharpened or
changed will help reduce uneven wear and improve its
service life.

14.4 Tensioning the Chain

WARNING
To reduce the risk of severe personal injury from chain
derailment, check chain tension frequently, @ 6.5. At
operating temperatures, the chain stretches and sags. New
chain tends to stretch more than used chain. Tension the
chain so that the drive links cannot come out of the groove
on the underside of the guide bar.
To properly tension the chain:
► Switch off the pole pruner, @ 16.2.
► Remove the battery, @ 15.2.
1
2
► Loosen the nut (1).
► Lift the guide bar tip.
0458-191-8221-A
► Turn the side chain tensioner (2) clockwise to tighten the
chain.
The chain is properly adjusted when the distance between
the underside of the guide bar and the chain (a) is
between 0.04 in. (1 mm) and 0.08 in. (2 mm) and can still
be pulled easily along the bar by hand. Always wear
gloves when handling the chain.
► If the chain cannot be moved along the guide bar, it is too
tight.
– Reduce the tension by turning the side chain tensioner
counterclockwise until the chain can move freely along
the guide bar.
– Ensure that the drive links remain in the groove and that
the distance between the underside of the guide bar and
the chain (a) is between 0.04 in. (1 mm) and 0.08 in.
(2 mm).
► Once the chain is properly tensioned, lift the guide bar tip
and tighten the nut to secure the chain sprocket cover.
► Finally, ensure that the distance between the underside of
the guide bar and the chain (a) is between 0.04 in. (1 mm)
and 0.08 in. (2 mm).
NOTICE
Always release tension on the chain after finishing work. The
chain contracts as it cools down. If it is not slackened, it can
damage the drive shaft and bearings. Properly re-tension
the chain before using the pole pruner again.

14.5 Lubricating the Saw Chain and Guide Bar

14.5.1 Bar and Chain Lubricant
WARNING
Never operate your pole pruner without bar and chain
a
lubrication. If the chain runs dry, the cutting attachment will
be damaged beyond repair within a very short time. A
damaged chain may break, resulting in severe or fatal
personal injury. Always check chain lubrication and the oil
level in the tank before starting work and periodically during
work.
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