Makita DUC121 Manual De Instrucciones página 20

– The file should only engage the material on the for-
ward 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. (Fig. 23)
– After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
– 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. 24)
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".)
Remove the push nut using a slotted bit screwdriver with
a slender shaft or the like. (Fig. 25)
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. (Fig. 26)
Insert the battery cartridge into the tool.
Pull the switch trigger to flow built-up dust or particles off
the oil discharge hole by discharging chain oil. (Fig. 27)
Remove the battery cartridge from the tool.
Insert the cleaned oil filter into the oil discharge hole.
When the filter is too dirty, replace it with a new one.
(Fig. 28)
Insert the push nut with its correct side facing up as
shown in the figure into the oil discharge hole to secure
the filter. When the filter cannot be secured with a disfig-
ured push nut, replace the push nut with a new one.
(Fig. 29)
Reinstall the sprocket cover and saw chain on the tool.
Replacing the sprocket (Fig. 30 & 31)
Before fitting a new saw chain, check the condition of the
sprocket.
CAUTION:
• A worn sprocket will damage a new saw chain. Have
the sprocket replaced in this case. The sprocket need
to be installed so that it always faces as shown in the
figure.
20
Always fit a new locking ring when replacing the
sprocket.
Replacing carbon brushes (Fig. 32 & 33)
Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
Use a screwdriver to remove the brush holder caps. Take
out the worn carbon brushes, insert the new ones and
secure the brush holder caps.
Storing tool
Clean the tool before storing. Remove any chips and
sawdust from the tool after removing the sprocket cover.
After cleaning the tool, run it under no load to lubricate
the saw chain and guide bar.
Cover the guide bar with the scabbard.
Remove oil from the oil tank to empty it and place the
chain saw with the tank cap facing upward.
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be per-
formed by Makita Authorized Service Centres, always
using Makita replacement parts.