Manual Makita UC4050A (page 16 of 120) (English, German, Dutch, Danish, French, Italian, Portuguese, Turkish, Spanish)

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Cleaning the chain saw

Clean the saw regularly with a clean rag. The handles, in

particular, must be kept free of oil.

Checking the plastic housing

Carry out regular visual inspections of all parts of the

housing. If any parts are damaged, have them repaired

immediately and properly in MAKITA authorized service

centers.

Sharpening the saw chain

CAUTION:

• Always withdraw the mains plug and wear safety

gloves when performing work on the saw chain.

Sharpen the saw chain when: (Fig. 35)

– 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 behavior 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 MAKITA

authorized service center.

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 91PX: 0.65 mm (Fig. 36)

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 91PX: 80° (Fig. 37)

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 91PX: 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.

– Guide the file as shown in the figure. (Fig. 38)

– 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. 39)

– After sharpening the chain, check the height of the

depth gauge using the chain gauge tool (optional

accessory). (Fig. 40)

– Remove any projecting material, however small, with a

special flat file (optional accessory).

– Round off the front of the depth gauge again.

Cleaning the guide bar and lubricating the

return sprocket

CAUTION:

• Always wear safety gloves for this task. Burrs present a

risk of injury.

Check the running surfaces of the bar regularly for

damage. Clean using a suitable tool, and remove burrs if

necessary. (Fig. 41)

If the chain saw receives frequent use, lubricate the return

sprocket bearing at least once a week. Before adding new

fresh grease, carefully clean the 2 mm hole on the tip of

the guide bar, then force a small quantity of multi-purpose

grease (optional accessory) into the hole.

Cleaning the oil guide (Fig. 42)

– Clean the oil guide groove and the oil feed hole in the

bar at regular intervals.

New saw chains

Use two or three saw chains alternately, so that the saw

chain, sprocket and running surfaces of the bar wear

evenly.

Turn the bar over when changing the chain so that the bar

groove wears evenly.

CAUTION:

• Only use chains and bars which are approved for this

model of saw (refer to “SPECIFICATIONS”).

Before fitting a new saw chain, check the condition of the

sprocket. (Fig. 43)

CAUTION:

• A worn sprocket damages a new saw chain. Have the

sprocket replaced in this case.

Always fit a new locking ring when replacing the sprocket.

Maintaining the chain and run-down

brakes

The braking systems are very important safety features.

Like any other component of the chain saw, they are

subject to a certain degree of wear. They must be

inspected regularly by MAKITA authorized service

centers. This measure is for your own safety.

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Makita UC4050A Manual

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