Sharpening The Saw Chain; Maintenance - Makita GCU04 Instruction Manual

Parallel-to-grain cut
CAUTION:
Parallel-to-grain cut may only be
performed by trained persons. The possibility of
kickback presents a risk of injury.
Perform the parallel-to-grain cut at as shallow an angle
as possible.
Fig.29
Carrying tool
Before carrying the tool, always apply the chain brake
and remove the battery cartridge from the tool. Then
attach the guide bar cover. Also cover the battery car-
tridge with the battery cover.
2
Fig.30
► 1. Guide bar cover 2. Battery cover

MAINTENANCE

CAUTION:
Always be sure that the tool is
switched off and the battery cartridge is removed
before attempting to perform inspection or
maintenance.
CAUTION:
Always wear gloves when perform-
ing any inspection or maintenance.
NOTICE:
Never use gasoline, benzine, thinner,
alcohol or the like. Discoloration, deformation or
cracks may result.
To maintain product SAFETY and RELIABILITY,
repairs, any other maintenance or adjustment should
be performed by Makita Authorized or Factory Service
Centers, always using Makita replacement parts.

Sharpening the saw chain

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.
(caused by uneven sharpening of the saw chain or
damage to one side only)
Sharpen the saw chain frequently but a little 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 our
authorized service center.
Sharpening criteria:
WARNING:
the cutting edge and depth gauge increases the
risk of kickback.
1
Fig.31
► 1. Cutter length 2. Distance between cutting edge
and depth gauge 3. Minimum cutter length (3 mm)
— All cutter length must be equal. Different cutter
lengths prevent the saw chain from running
smoothly and may cause the saw chain to break.
— Do not sharpen the chain when the cutter length
has reached 3 mm or shorter. The chain must be
replaced with new one.
— The chip thickness is determined by the distance
between the depth gauge (round nose) and the
cutting edge.
— The best cutting results are obtained with following
distance between cutting edge and depth gauge.
•
Fig.32
16 ENGLISH
An excessive distance between
2
1
1
3
1
Chain blade 91PX : 0.65 mm (0.025")
30
55
2
30
55