Briggs & Stratton NAX 400C Bedienungsanleitung Seite 46

MAINTENANCE OF THE SPARK PLUG
To ensure proper operation of the engine, check the condition of the spark plug, check its cleanliness and the gap, which should be
0.5-0.7 mm. Use original TORCH L8RTF spark plugs. Always do the following with the engine off:
1. Carefully pull the high voltage cable from the spark plug. Do not pull on the cable, just directly on the plug.
2. Unscrew the spark plug using the spark plug wrench provided.
3. Visually inspect the spark plug for damage and dirt. Use a copper wire brush to remove carbon and soot deposits.
4. Check the gap with a feeler gauge and adjust the electrode distance to 0.5 to 0.7 mm (Fig. (Rys.) 23).
5. Check the spark plug washer, screw the spark plug with a spark plug wrench. Torque 12-15 Nm.
6. Install the power cord on the spark plug.
7. In case of any problems please contact the NAX Service Center.
CLEANING THE GUIDE AND CHAIN
After every 5 hours of operation or more often, depending on the operating conditions, check the condition of the guide bar and chain.
To do this, remove the chain from the guide bar and then:

remove sawdust from the guide groove and oil hole,

lubricate the chain guide mode through the grease supply hole at the end of the guide 12 (Fig. (Rys.) 1).
Occasionally invert the guide bar to avoid partial wear.
The guide rail should always have a rectangular shape.
Check the wear of the guide rail. To do this, place a ruler 1 (Fig. (Rys.) 24) to the guide outside the blade. If there is a gap between
them (2 Fig. (Rys.) 24) the rail is good. Otherwise, if there is no space 3 (Fig. (Rys.) 24) the chain is tilted (4 Fig. (Rys.) 24) the rail
is worn. Such a guide needs repair or replacement.
RACK CONTROL
Check for cracks and excessive wear affecting chain drive. If wear is found, replace the rack with a new one. Never put a new chain
on a worn sprocket or a worn chain on a new sprocket.
1 - clutch basket with fixed rack
2 - floating rack
3 - needle bearing
4 - clutch basket with floating rack
CARBURETTOR ADJUSTMENT
The carburettor of the device has been adjusted at the factory, but may need to be adjusted during normal use. Before doing this,
make sure that:

the saw was previously started and warmed up,

choke is off,

the air filter and fuel filter are clean,

the mixture is fresh and without any impurities.
The idle speed can be adjusted by using the marked screw 1 (Fig. (Rys.) 26). By turning the screw counterclockwise the rotation
decreases, by turning the screw clockwise we increase the rotation. To set the speed, turn the idle adjustment screw slowly clockwise
until the chain begins to rotate, and then turn the screw counterclockwise until the chain stops moving.
CAUTION! If, after adjustment, the chain moves while the engine is idling, have it repaired at the NAX Authorized Service.
Mixture composition adjustment: this operation should be carried out by the service, as incorrect adjustment may cause the engine
to overheat or seize. Incorrect regulation has a negative impact on environmental protection and carries the risk of losing warranty
protection. Do not take this action if you do not have the appropriate knowledge and tools.
CHAIN SHARPENING
The cutting tool should always be clean and sharp to ensure efficient and safe work. Working with a chain saw with a blunt chain
causes faster wear of the guide chain and chain drive wheel, and in extreme cases can lead to chain breakage. That is why it is
important to sharpen the chain in time. Sharpening the chain yourself requires the use of special tools and skills, so it is
recommended to entrust the sharpening of the chain to qualified persons or gardening tools services. An authorized NAX service is
recommended.
Blades need sharpening when:

sawdust is in the form of dust,
46 EN