Manual McCulloch Mac4-18XT (page 13 of 15) (English, German, French, Spanish)

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BAR MAINTENANCE

If your saw cuts to one side, has to be forced

through the cut, or been run with an improper

amount of bar lubrication it may be neces-

sary to service your bar.

A worn bar will damage your chain andmake

cutting difficult.

After each use, ensure ON/STOP switch is

in the STOP position, then clean all sawdust

from the guide bar and sprocket hole.

To maintain guide bar:

S Move ON/STOP switch to the STOP posi-

tion.

S Loosen and remove chain brake nuts and

chain brake. Remove bar and chain from

saw.

S Clean the oil holes a nd bar groove after each

5 hours of operation.

Remove Sawdust From

Guide Bar Groove

Oil Holes

S Burring of guide bar rails is a normal

process of rail wear. Remove these burrs

with a flat file.

S When rail top is uneven, use a flat file to re-

store square edges and sides.

Correct GrooveWorn Groove

File Rail Edges

and Sides

Square

Replace guide bar when the groove is worn,

the guide bar is bent or cracked, or when

excess heating or burring of the rails occurs.

If replacement is necessary, use only the guide

bar specified for your saw in the repair parts list

or on the decal located on the chain saw.

SPARK PLUG

The spark plug should be replaced each

year to ensure the engine starts easier and

runs better . Ignition tim ing is fixed and non-

adjustable.

1. Loosen 3 screws on cylinder cover.

2. Remove the cylinder cover .

3. Pull off the spark plug boot.

4. Remove spark plug from cylinder and

discard.

5. Replace with Champion RCJ--7Y spark

plug and tighten securely with a 19 mm

socket wrench. Spark plug gap should

be 0,5 mm.

6. Reinstall the spark plug boot.

7. Reinstall the cylinder cover and 3

screws. Tighten securely .

Screws

Spark

Plug Boot

Spark

Plug

Cylinder

Cover

CHAIN SHARPENING

Chain sharpening is a complicated task that

requires special tools. We recommend that

you refer chain sharpening to a professional

chain sharpener.

CARBURETOR ADJUSTMENTS

WARNING: Thechainwillbemoving

during most of this procedure. W ear your pro-

tective equipment and observe all safety pre-

cautions. The chain must not move at idle

speed.

The carburetor has been carefully set at the

factory. Adjustments may be necessary if

you notice any of the following conditions:

S Chain moves a t idle. See IDLE SPEED--T

adjusting procedure.

S Saw will not idle. See IDLE SPEED--T ad-

justing procedure.

Idle Speed ---T

Allow engine to idle. If the chain moves, idle

is toofast. If the enginestalls, idle is too slow.

Adjust speed until engine runs without chain

movement (idle too fast) or stalling (idle too

slow). The idle speed screw is located in the

area above the p rimer bulb and is labeled T.

S Turn idle speed screw (T) clockwise to in-

crease engine speed.

S Turn idle speed screw (T) counterclock-

wise to decrease engine speed.

STORAGE

WARNING: Stop engine and allow to

cool, and secure the unit before storing or

transporting in a vehicle. Store unit and fuel

in an area where fuel vapors cannot reach

sparks or open flames from water heaters,

electric motors or switches, furnaces, etc.

Store unitwithall guards in place. Position so

that any sharp object cannot accidentally

cause injury to passersby. Store the unit out

of reach of children.

S Before storing, drain all fuel from the unit.

Start engine and allow to run until it stops.

S Clean the unit before storing. Pay p a rticu-

lar attention to the air intake a rea, keeping

it free of debris. Use a mild detergent and

sponge to clean the plastic surfaces.

S Do not store theunit or fuel ina closedarea

where fuel vapors can reach sparks or an

openflame from hotwater heaters, electric

motors or switches, furnaces, etc.

S Store in a dry area out of the reach o f chil-

dren.

S Ensure the machine is cleaned and that a

complete service is carried out before

long--term storage.

S The guide bar and chain must always be

covered with a scabbard when the machine

is being transported or i n storage in order to

prevent accident contact with the sharp

chain. Even a non--moving chain can cause

serious cuts to yourself or persons you

bump into with an exposed chain.

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McCulloch Mac4-18XT Manual

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