-24-
4.2 Saw chain change
Danger
It is imperative to pull the power
plug before replacing the saw
chain.
Risk of injury even if the saw chain
is standing still.
Proceed as follows to replace the saw chain:
Unfasten cylinder head bolt 13 using
combination screw driver 11 enclosed in the
supply and fastened on cover 12 (Fig. 1) and
fold down the cover.
Open the spring-loaded bottom guard flap 15
(Fig. 2) downwards and fasten it with the cover
in open position.
Unscrew the hexagon socket head cap screw
18 (Fig. 2) and remove the Intermediate cover
19 including the oil tank.
Unfasten the fastening screw 5 (Fig. 1) for the
lower chain deflection protection and fold down
the guard plate 6.
Release the chain tension by turning the
tensioning screw 20 (Fig. 3) to the left by means
of combination screw driver 11.
Pull off the guide rail 21 including the saw chain
and chain wheel 22 to the front and remove the
chain.
Place a new or freshly sharpened saw chain
onto the guide rail and the chain wheel. In the
process, pay attention that the tooth cutting
edges of the chain point in direction of the
marking 24 for the direction of travel and that
the chain fastening bolt 23 engages in the hole
in the guide rail provided for that purpose.
Using combination screw driver 11 (Fig. 7), twist
the gear shaft such that chain wheel 22 with the
fitted saw chain easily engages in the driving
gear teeth.
Caution!
After installation of the saw chain
set, immediately pull off
combination screw driver 11.
Slide open the intermediate cover 19 and
slightly tighten the hexagon socket head cap
screw 18. Using combination screw driver 11,
turn the clamping screw 20 (Fig. 3) that can be
reached through the hole in the intermediate
cover clockwise until the correct chain tension
has been achieved (see section 4.3).
Tighten the hexagon socket head cap screw 18.
Fold up the protection for the bottom chain
deflection and tighten it with screw 5 (Fig. 1).
Unlock the bottom guard flap 15 (Fig. 2). Fold
up the cover 12 and tighten the cylinder head
bolt 13. Fasten combination screw driver 11 in
the brackets inside the cover.
If a new saw chain has been fitted, it must be run in in
idling mode for approx. 2 to 3 minutes. Pay attention
to adequate chain lubrication. After running-in, it may
be necessary to correct the chain tension.
4.3 Chain tension
For a safe operation of the machine and for the life
time of the entire chain set it is important that the
correct chain tension is set. This must therefore be
checked prior to start-up and once in a while during
operation. The chain tension is set correctly if in a
cold operating condition, the saw chain abuts on the
guide rail and can be manually lifted by 3 to 4 mm
(1/8 to 3/16 in.).
When heated to operating temperature, the saw chain
elongates and starts to sag. If the elongation is that
large that the chain links start to disengage from the
guide at the rail, the saw chain must be retensioned.
Danger
Pull the power plug during all
service work.
Proceed as follows to retension the saw chain:
Open the spring-loaded bottom guard flap 15
(Fig. 2) downwards. Using combination screw
driver 11 fastened on cover 12 (Fig. 1), slightly
release the hexagon socket head cap screw 18
(Fig. 2) through the bottom opening in cover 12
and screw 5 (Fig. 1).
Adjust the chain tensioning screw 20 through
the top opening in the cover (see Fig. 1) using
combination screw driver 11. Turning clockwise
means increasing and turning anti-clockwise
means decreasing the chain tension.
