Makita LXT DUC302RF2 - Инструкция по эксплуатации - Страница 16

16 ENGLISH

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.

Sharpening criteria:

—  All cutter length must be equal. Cutters of differing 

length prevent the chain from running smoothly, 

and may cause the chain to break.

—  Do not sharpen the chain once a minimum cutter 

length of 3 mm has been reached. A new chain 

must then be fitted.

—  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.

Chain blade 90PX: 0.5 mm

Chain blade 91PX: 0.65 mm

Chain blade 25AP: 0.65 mm

► 

Fig.28:

1.

 Cutting length 

2.

 Distance between 

cutting edge and depth gauge 

3.

 Minimum 

3 mm

WARNING:

• 

An excessive distance increases the risk of 

kick-back.

—  The sharpening angle of 30 ° must be the same 

on all cutters. Differences in angle cause the chain 

to run roughly and unevenly, accelerate wear, and 

lead to chain breaks.

—  The side plate angle of the cutter is determined 

by the depth of penetration of the round file. If the 

specified file is used properly, the correct side 

plate angle is produced automatically.

—  Side plate angle for each saw chain are as follows:

Chain blade 90PX: 75 °

Chain blade 91PX: 80 °

Chain blade 25AP: 85 °

► 

Fig.29:

1.

 Side plate angle

File and file guiding

—  Use a special round file (optional accessory) for 

saw chains to sharpen the chain. Normal round 

files are not suitable.

—  Diameter of the round file for each saw chain is as 

follows:

Chain blade 90PX: 4.5 mm

Chain blade 91PX: 4.0 mm

Chain blade 25AP: 4.0 mm

— 

The file should only engage the cutter on the forward 

stroke. Lift the file off the cutter on the return stroke.

—  Sharpen the shortest cutter first. Then the length 

of this shortest cutter becomes the standard for all 

other cutters on the saw chain.

► 

Fig.30

—  Guide the file as shown in the figure.

— 

The file can be guided more easily if a file holder 

(optional 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).

► 

Fig.31

—  After sharpening the chain, check the height of the 

depth gauge using the chain gauge tool (optional 

accessory).

► 

Fig.32

—  Remove any projecting material, however small, 

with a special flat file (optional accessory).

—  Round off the front of the depth gauge again.

Cleaning guide bar

► 

Fig.33

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 dis-

charge hole during operation.

Small dust or particles built up in the oil discharge hole 

may impair the oil discharge flow and cause an insuffi

-

cient 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.34:

1.

 Slotted screwdriver

Remove the small dust or particles using a slotted 

screwdriver with a slender shaft or the like.

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.

Remove the battery cartridge from the tool.

Reinstall the sprocket cover and saw chain on the tool.

Replacing the sprocket

► 

Fig.35:

1.

 Sprocket 

2.

 Locking ring

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 needs to be installed so that it always 

faces as shown in the figure.

► 

Fig.36:

1.

 Locking ring 

2.

 Sprocket

Always fit a new locking ring when replacing the 

sprocket.