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• Remove sawdust and dirt from the chain.
• Check that there is no burr on the bar or remove it.
3. Air filter
• Remove the filter and cylinder cover and remove the filter.
• Brush the filter with a (soft) brush. Blow the dirt inside the filter out – see (fig. 17). When
refitting the main filter, make sure that the tabs on the filter edge fit properly into the recess
on the cylinder cover.
4. Lubrication check
• Check that the output oil opening for bar and chain lubrication is not clogged – see
(fig. 18 a) (Lubrication hole).
5. Clean the surface.
6. Install the bar and chain. Assemble.
Note: I
When out of operation for a period of more than 7 days, follow the CHAIN OIL AND
FUEL STORAGE chapters.
REGULAR MAINTENANCE
1. Cylinder ribs
• Dust settled between the ribs of cylinder causes the engine to overheat. Regularly check
and clean the ribs after removing the air filter. When installing the cylinder cover, make sure
the filter is correctly positioned.
2. Fuel filter
• Using a wire hook, remove the fuel filter through the fuel tank filler opening (fig. 19).
• Disassemble the filter and wash it in petrol or replace as needed. After removing the filter,
use a clamp to hold the end of the suction hose. When installing the filter, prevent the filter
fibres or other contaminants from entering the suction hose.
• If the inside of the fuel tank is dirty, wash it out with petrol.
• Before putting the fuel filter back, check the condition of the fuel hoses. If they are damaged
or worn, do not use the machine and have it repaired by an expert.
3. Oil tank
• Using a wire hook, pull the oil filter through the oil tank filler hole and clean it in petrol.
After inserting the filter back into the tank, make sure it is in the front left corner. Clean
the oil tank from dirt (fig. 20) (2-Oil filter).
4. Spark plug
• Clean the electrodes with a wire brush and adjust the distance to 0.65 mm as needed – see
(fig. 13). Replace the spark plug if worn.
5. Sprocket/chain drum
• Check for cracks or excessive wear. If you find the sprocket/chain ring worn out, replace it
immediately with a new one.
HECHT_925_R_MANUAL_2022_EN.indd 35HECHT_925_R_MANUAL_2022_EN.indd 35 28.03.2023 11:58:0428.03.2023 11:58:04
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