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EN 45
cracks or deformations.
Damaged parts must be replaced with new ones, recommended by the manufacturer. For safety, replace the knives every
two years. Knives should be well sharpened (details in chapter "Sharpening a knife"). Blunt knives tug at the grass, causing
the tips to yellow.
Attention! It is imperative to balance the knife after each sharpening. An unbalanced blade can cause
dangerous vibrations that can damage the mower and / or cause an accident.
Check the knife clamping screw often. The screw must be firmly tightened to a torque of 45 to 55 Nm.
REMOVING THE KNIFE (Fig. (Rys.) 18)
1 Adapter
2 Knife
3 Saddle half pad
4 Screw
Attention! Cutting knife 2 (Fig. 18) it can be very sharp, use gloves to protect your hands against injury.
1.
Empty the fuel tank.
2.
Use a wooden block to prevent the knife from turning.
3.
Loosen the screw that holds the knife.
4.
Check the condition of the knife (see chapter "Operation of the cutting knife").
5.
Replace a worn or damaged knife with a new one recommended by the manufacturer.
6.
Tighten the screw to 45 to 55 Nm. If the clamping screw is too loose, the knife may become loose, which may
cause an accident.
Attention! When installing the knife, remember about the direction of the knife. If the knife is incorrectly
fastened, it will not cut properly and may cause an accident.
THE MOST IMPORTANT KNIFE PARAMETERS (Fig. (Rys.) 19)
A - length (420 mm), shorter knives are allowed, but then you have to take into account that the effective cutting width will
be smaller,
B - width (50 mm),
C - clamping hole diameter (11 mm),
D - hole center distance (27 mm),
Hole diameter 11x11 mm circle for safety wedges is standard and amounts to 15.5 mm.
It is recommended to use NAX cutting knives dedicated to the given mower model.
Attention! The shape of the knife indicates its characteristics, depending on the shape of the knife is more
suitable for: mowing with a basket, mowing with side ejection or mulching. The universal knife used in the
factory may turn out to be less efficient than we would have expected, so it is recommended to buy accessory
knives for each function, i.e. one for grinding, the other for throwing grass into the basket.
SPARK PLUG OPERATION
Spark plug 17 (Fig. (Rys.) 20A) must be replaced at the beginning of each season or after 100 hours of operation.
Use original
B&S QC12YC / B&S 797429
spark plugs. Recommended gap between electrodes is: 0.51 mm (Fig. (Rys.) 20B).
Check the gap with a blade feeler gauge.
OIL REPLACEMENT
The first oil change should be carried out after 4 to 5 hours of engine operation. Perform next oil changes every 25 hours of
operation or more often. The oil drain plug may be mounted on the engine block, but this depends on the engine model. If
the engine does not have a drain plug in the engine block, pour oil with the filler plug after emptying the fuel tank:
Unscrew the oil filler cap with the dipstick.
Remove the air filter to prevent it from absorbing gasoline when the mower is tilted.
Tilt the mower to the oil filler plug side 15 (Fig. 21).
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