Makita DUC121 Bedienungsanleitung Seite 14

If you try to cut off thick branches from the bottom, the
branch may close in and pinch the saw chain in the cut.
If you try to cut off thick branches from the top without a
shallow undercut, the branch may splinter.
► Fig.19
If you cannot cut the timber right through with a single
stroke:
Apply light pressure to the handle and continue saw-
ing and draw the chain saw back a little; then apply
the spike a little lower and finish the cut by raising the
handle.
► Fig.20
Carrying tool
► Fig.21: 1. Battery cartridge 2. Scabbard (chain
cover)
Always remove the battery cartridge from the tool and
overlap the guide bar with the scabbard before carrying
the tool. Also cover the battery cartridge with the battery
cover.
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and
the battery cartridge is removed before attempt-
ing to perform inspection or maintenance.
• Always wear gloves when performing any
inspection or maintenance.
• Never use gasoline, benzine, thinner, alcohol
or the like. Discoloration, deformation or cracks
may result.
Sharpening the saw chain
CAUTION:
• Always remove the battery cartridge and wear
safety gloves when performing work on the saw
chain.
► Fig.22
Sharpen the saw chain when:
— Mealy sawdust is produced when damp wood is
cut;
— The chain penetrates the wood with difficulty, even
when heavy pressure is applied;
— The cutting edge is obviously damaged;
— The saw pulls to the left or right in the wood. The
reason for this behaviour is uneven sharpening of
the saw chain, or damage to one side only.
Sharpen the saw chain frequently,
but remove only a little material each
time.
Two or three strokes with a file are usually sufficient for
routine resharpening. When the saw chain has been
resharpened several times, have it sharpened in a
MAKITA specialist repair shop.
File and file guiding
— Use a special round file (optional accessory) for
saw chains, with a diameter of 4 mm, to sharpen
the chain. Normal round files are not suitable.
► Fig.23
— The file should only engage the material on the
forward stroke. Lift the file off the material on the
return stroke.
— Sharpen the shortest cutter first. The length of this
cutter is then the gauge dimension for all other
cutters on the saw chain.
— Guide the file as shown in the figure.
— The file can be guided more easily if a file holder
(accessory) is employed. The file holder has
markings for the correct sharpening angle of 30 °
(align the markings parallel to the saw chain) and
limits the depth of penetration (to 4/5 of the file
diameter).
Guide the file as shown in the figure.
— After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
► Fig.24
— Remove any projecting material, however small,
with a special flat file (optional accessory).
— Round off the front of the depth gauge again.
— Wash away dust and particles from saw chain
after adjusting the height of depth gauge.
Cleaning guide bar
► Fig.25
Chips and sawdust will build up in the guide bar groove,
clogging it and impairing oil flow. Always clean out the chips
and sawdust when sharpening or replacing the saw chain.
Cleaning the oil filter at the oil
discharge hole
Small dust or particles may be built up in the oil filter at
the oil discharge hole during operation.
Small dust or particles built up in the oil filter may impair
the oil discharge flow and cause an insufficient lubrica-
tion on the whole saw chain.
When a poor chain oil delivery occurs at the top of
guide bar, clean the filter as follows.
Remove the battery cartridge from the tool.
Remove the sprocket cover and saw chain from the
tool. (Refer to the section titled " Installing or removing
saw chain ".)
► Fig.26: 1. Push nut 2. Slotted bit screwdriver
Remove the push nut using a slotted bit screwdriver
with a slender shaft or the like.
► Fig.27: 1. Filter
Take the filter out of the chain saw and remove small
dust or particles from it. When the filter is too dirty,
replace it with a new one.
Insert the battery cartridge into the tool.
► Fig.28
Pull the switch trigger to flow built-up dust or particles
off the oil discharge hole by discharging chain oil.
Remove the battery cartridge from the tool.
► Fig.29: 1. Filter
14 ENGLISH