McCulloch MAC 316 XT BAR Maintenance, Spark Plug, Chain Sharpening, Carburetor Adjustments

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 and make 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:

SMove ON/STOP switch to the STOP posi- tion.

SLoosen and remove chain brake nuts and chain brake. Remove bar and chain from saw.

SClean the oil holes and 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.

SWhen rail top is uneven, use a flat file to re- store square edges and sides.

File Rail Edges

and Sides Square

Worn Groove Correct Groove

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 timing 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	Cylinder
Spark	Cover
Plug Boot

Spark

Plug

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: The chain will be moving during most of this procedure. Wear 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:

SChain moves at idle. See IDLE SPEED--T adjusting procedure.

SSaw will not idle. See IDLE SPEED--T ad- justing procedure.

Idle Speed---T

Allow engine to idle. If the chain moves, idle is too fast. If the engine stalls, 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 primer bulb and is labeled T.

STurn idle speed screw (T) clockwise to in- crease engine speed.

STurn 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 unit with all guards in place. Position so that any sharp object cannot accidentally cause injury to passersby. Store the unit out of reach of children.

SBefore storing, drain all fuel from the unit.

Start engine and allow to run until it stops.

SClean the unit before storing. Pay particu- lar attention to the air intake area, keeping it free of debris. Use a mild detergent and

sponge to clean the plastic surfaces.

SDo not store the unit or fuel in a closed area where fuel vapors can reach sparks or an open flame from hot water heaters, electric motors or switches, furnaces, etc.

SStore in a dry area out of the reach of chil- dren.

SEnsure 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 in 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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