CAUTION: Always be sure that the tool is
switched off and the battery cartridge is removed
before carrying out any work on the tool.
CAUTION: Do not touch the saw chain with
bare hands. Always wear gloves when handling
the saw chain.
Removing or installing saw chain
CAUTION: The saw chain and the guide bar
are still hot just after the operation. Let them cool
down enough before carrying out any work on the
tool.
CAUTION: Carry out the procedure of
installing or removing saw chain in a clean place
free from sawdust and the like.
To remove the saw chain,
perform the following steps:
1. Release the chain brake by pulling the front
hand guard.
2. Loosen the chain adjusting
screw, then the retaining
nut.
► Fig.9: 1. Chain adjusting screw
2. Retaining nut
3. Remove the sprocket cover then remove
the saw chain and guide bar from the chain saw body.
To install the saw chain,
perform the following steps:
1. Check the direction of the saw chain. Match
the direction of the saw chain with that of the mark on
the chain saw body.
2. Fit one end of the saw chain on the top of
the guide bar.
3. Fit the other end of the saw chain around
the sprocket, then attach the guide bar to the chain saw
body, aligning the hole on the guide bar with the pin on
the chain saw body.
► Fig.10: 1. Sprocket 2. Hole
4. Insert the protrusion on the sprocket cover
to the chain saw body, and then close the cover so that
the bolt and pins on the chain saw body meet their
counterparts on the cover.
► Fig.11: 1. Protrusion 2. Sprocket cover 3.
Bolt 4. Pin
5. Tighten the retaining nut
to secure the sprocket
cover, then loosen it
a bit for tension
adjustment. ► Fig.12: 1.
Retaining nut
Adjusting saw chain tension
CAUTION: Do not tighten the saw chain too
much. Excessively high tension of saw chain may
cause breakage of saw chain, wear of the guide bar
and breakage of the
adjusting dial.
CAUTION: A chain which is too loose can
jump off the bar and it may cause an injury
accident.
The saw chain may become
loose after many hours of use.
From time to time check the saw chain tension before
use.
1. Release the chain brake by pulling the front
hand guard.
2. Loosen the retaining nut a bit to loosen the
sprocket cover lightly.
► Fig.13: 1. Retaining nut
3. Lift up the guide
bar tip slightly and
adjust the chain tension.
Turn the chain adjusting
screw clockwise to tighten, turn it
counterclockwise to loosen.
For chain blade 90PX and 91PX:
Tighten the saw chain until
the lower side of
the saw chain fits
in the guide bar
rail as illustrated.
► Fig.14: 1. Guide bar 2. Saw chain 3.
Chain adjusting screw
For chain blade 25AP:
Tighten the saw chain so
that the gap between the
center of the lower side of the guide bar and the saw
chain becomes approximately 1 mm to 2 mm.
4. Keep holding the guide bar lightly and
tighten the sprocket cover.
For chain blade 90PX and 91PX:
Make sure that the saw chain does not loose at the
lower side.
For chain blade 25AP:
Make sure that the gap between the center of the lower
side of the guide bar and the saw chain is
approximately 1 mm to 2 mm.
5. Tighten the retaining nut
to secure the sprocket
cover.
► Fig.15: 1. Retaining nut
Make sure the saw chain
fits snugly against the
lower side of the bar.
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