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The inside of the drive wheels should be cleaned once a season. To clean a wheel, remove the hub- cap, screw, washer, and wheels. Brush or blow the gear and the gear ring on the wheel to clean them from grass and dirt (fig. 19). Remount the wheel.
COOLING SYSTEM
Before use, the engine's cooling system should be cleaned. Clean the cylinder's cooling fins and the air intake, removing any grass cuttings, dirt and the like.
LUBRICATION
Set at the lowest cutting height. Slacken the screws and remove the transmission casing. Lubricate the driveshaft by the slide bearings with oil or oil spray at least once a season (fig. 20).
CHANGING OIL
Replace the oil when the engine is warm and the fuel tank is empty. Take care while draining as the oil is hot, this is to prevent burns.
Change the oil the first time after 5 hours of oper- ation, and subsequently after every 50 hours of op- eration or once a season. Remove the dip stick, tilt the mower and let the oil run out into a container. Be careful not to let any oil run on to the grass.
Fill with new oil: use oil of SAE 30 or SAE 10W- 30 quality. The crankcase holds approx. 0.6 litre. Fill until the oil reaches the “FULL/MAX” mark on the dip stick. Do not fill with too much oil.
AIR FILTER
A dirty and blocked air filter reduces the engine output and increases engine wear.
Briggs & Stratton LS 45 / LS 38: Carefully re- move the air cleaner so that no dirt falls down into the carburettor (fig. 21). Take out the foam plastic filter element and wash it in liquid detergent and water. Dry the filter element. Pour a little oil on the filter element and squeeze it in. Refit the air clean- er.
Wash the filter every three months or every 25 hours running, whichever comes first, or more fre- quently if used in dusty conditions.
Briggs & Stratton ES 45: Loosen the screw and fold down the cover of the air cleaner. Carefully remove the filter cartridge (fig. 22). Knock it against a flat surface. Replace the filter cartridge with a new one if it is still dirty.
Clean the filter every three months or after every 25 hours of use, which ever occurs first. More of- ten if the lawn mower is used on dusty ground.
Honda: Take off the cover then remove the filter (Fig. 23). Check the filter carefully for holes or other damage. A broken or damaged filter must be replaced.
To remove dirt, tap the filter several times against a hard surface, or blow compressed air through the filter from the back. Try not to clean the filter by brushing, as this will force the dirt into the fibres. A very dirty filter should be replaced.
Clean the air filter after every 25 hours of use, or once every season; more often if the motor is used on dusty terrain.
Tecumseh: Check the air filter after every 25 hours of use, more often if the engine is used in dusty conditions. If the foam filter is dirty or blocked it should be replaced.
Dismantle the cover A. Clean inside the cover A and the filter support E, (fig. 24). Soak the foam filter C with two teaspoons (approx. 20 ml) of en- gine oil. Massage the filter with a clean cloth to re- move any excess oil. Also check the seal D, replace it if damaged or deformed.
Refit the cover A.
SPARKING PLUG
Never remove the spark plug or the igni- tion lead when checking to see if there is any spark, always use an approved test instrument.
Clean the sparking plug regularly (every 100 hours running). Use a wire brush for cleaning and adjust the correct spark gap (fig. 25).
Change the sparking plug if the electrodes are ex- cessively burnt or if the plug is damaged. The rec- ommendations of the engine manufacturers are as follows:
Briggs & Stratton: Champion J19LM (RJ19LM), Spark gap 0,75 mm.
Honda: BPR6ES (NGK),
Spark gap
10
