Makita UC250DZ, Instruction Manual

Page: 15 / 104

15
MAINTENANCE
CAUTION:
•
Always be sure that the tool is switched off and the
battery cartridge is removed before attempting 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.32
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.
1
2
011075
−
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.33
−
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.34
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 discharge hole
Small dust or particles may be built up in the oil
discharge hole during operation.
Small dust or particles built up in the oil discharge hole
may impair the oil discharge flow and cause an
insufficient lubrication on the whole saw chain.
When a poor chain oil delivery occurs at the top of
guide bar, clean the oil discharge hole 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.35
Remove the small dust or particles using a slotted bit
screwdriver with a slender shaft or the like.
Insert the battery cartridge into the tool.
Fig.36
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.
Reinstall the sprocket cover and saw chain on the tool.
Replacing the sprocket
Before fitting a new saw chain, check the condition of the
sprocket.
1. File forward stroke
2. 1/5 of the file diameter