Festool IS 330 EB Original Operating Manual page 29

11.1 Chain tension
With the cover of the chain sprocket [2-1] slightly
released, rotate the chain adjustment wheel [2-
9] in the direction of the + arrow until the bot-
tom part of the chain hugs the guide bar of the
chain, as shown in Fig. [10]. Then tighten the chain
sprocket cover fi rmly [2-1] by turning the fasten-
ing wheel [2-2] clockwise. Check the chain for
correct tension by slightly pulling the bottom part
of the chain, as shown in Fig. [10]. Once released,
the chain must return to the initial position and
closely cling to the guide bar.
Chains that have been tightened while hot must
be released when the work is fi nished. When the
tightened chain has cooled, high tension occurs
due to its shrinkage, which might cause damage
to the machine!
11.2 Maintaining and sharpening the chain
The chain must be sharpened if the sawdust is
too fi ne, see Fig. [11].
11.3 Lubricating the chain
The oil reservoir capacity is 240 ml. To avoid heavy
wear, the chain and its guide bar must be continu-
ously lubricated during operation of the machine.
Lubrication is provided by an oil feed pump, which
delivers an optimal amount of oil into the lubrica-
tion groove in the guide bar. It is very important to
check the oil reservoir level and the chain lubrica-
tion function before you start working. If the oil
level [1-8] drops to the bottom indicator on the
oil gauge, the oil must be replenished.
Recommendation:
Use only the oil intended for chain saw lubrica-
tion. The use of used oil or any oil not intended
for chain lubrication is prohibited. Before opening
the oil reservoir, carefully clean the area around
the oil cap! Sawdust and chips that could get into
the reservoir may block the oil channels, which
can lead to a serious breakdown in chain lubri-
cation! Due to their composition, biodegradable
oils for chain lubrication have reduced lubricating
ability, and a prolonged break in the operation of
the machine might make the inner lubrication
channels sticky. Therefore follow manufacturer
recommendations!
11.4 Maintaining the guide bar
The one-sided wear of the guide bar can be prevent-
ed by turning it after each time the chain is sharp-
ened. Worn-out outer guide surfaces (Fig. [9b])
are considered a normal operational wear. Use a
fi ne, fl at fi le to remove burred edges. The inner
guide surfaces (Fig. [9a]) become worn due to in-
suffi cient lubrication, incorrect chain lubrication,
or improper working procedure. The guide bar
must be replaced!
Under no circumstances can the chain links touch
the bottom of the guide bar channel. If the chain
touches the bottom of the channel, the guide bar
is so worn that it must be replaced. The lubrica-
tion ports and the guide bar channel (groove) must
be clean at all times.
11.5 Maintaining the chain sprocket
Most diffi culties with the chain are caused by in-
correct chain tightening or late replacement of the
chain sprocket. A worn chain sprocket can very
quickly damage the good portion of an expensive
cutting tool assembly. Don't be stingy about re-
placing the chain sprocket! It is recommended
that you replace the chain sprocket upon the sec-
ond replacement of the chain or earlier.
11.6 Replacing the chain and
guide bar
 Put the machine in the basic position and dis-
mantle the chain sprocket cover [2-1] by rotat-
ing the fastening wheel [2-2] counter clock-
wise, as shown in Fig. [2].
 Stretch the chain [2-3] over the chain sprocket
[2-8] and remove it together with the guide
bar [2-4].
 Put a new chain [2-3] on a (new) guide bar [2-
4] and insert it into the machine. Maintain the
proper position of the cutting teeth, accord-
ing to the direction of rotation. The direction of
rotation is indicated by an arrow on the body
of the machine, and under the chain sprocket
cover there is a symbol showing how the chain
should be mounted.
 Place the chain's guide links into the chain
sprocket teeth [2-8] and turn using the chain
adjustment wheel [2-9] (when rotated clock-
wise as seen from above, the pin moves up-
wards and releases; when rotated counter
clockwise as seen from above, the pin moves
downward) so that the opening on the guide bar
[2-5] snaps onto the tension bolt [2-6].
 Then put the chain sprocket cover [2-1] on the
clamping bolt [2-7] and tighten by rotating the
fastening wheel [2-2] clockwise. Make sure the
chain is tensioned correctly before tightening.
Check the chain for correct tension!
11.7 Replacing the chain sprocket
Remove the chain and the guide bar as described
above. Using a screwdriver, strip the snap safety
ring [8-1] from the spindle [8-4], and remove the
washer [8-2] and chain sprocket [8-3]. After re-
placement, put the washer and safety ring back
on.
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