Maintenance Of Saw Chain And Guide Bar - Hitachi CS40EM Mode D'emploi

2. Fuel filter
(a) Using a wire hook, take out the filter from the filler port.
Fuel filter
(b) Disassemble the filter and wash with gasoline, or replace
with a new one if needed.
NOTE
• After removing the filter, use a pinch to hold the end
of the suction pipe.
• When assembling the filter, take care not to allow fil-
ter fibers or dust inside the suction pipe.
3. Oil tank
With a wire hook, take out the oil filter through the filler port and
clean in gasoline. When putting the filter back into the tank,
make sure that it comes to the front right corner. Also clean off
dirt in the tank.
Oil filter

9. Maintenance of Saw Chain and Guide Bar

■ Saw Chain
WARNING
• It is very important for smooth and safe operation
to always keep the cutters sharp.
The cutters need to be sharpened when:
• Sawdust becomes powder-like.
• You need extra force to saw in.
• The cut path does not go straight.
• Vibration increases.
• Fuel consumption increases.
Cutter setting standards:
WARNING
• Be sure to wear safety gloves.
Before filing:
• Make sure the saw chain is held securely.
• Make sure the engine is stopped.
• Use a round file of proper size for the chain.
Chain type: 21BP/20BP
File size: 3/16 in (4.76 mm) 5/32 in (3.97 mm)
GB-14
33SL
4. Spark plug
0.6 ~ 0.7 mm
CS40EM/45EM RCJ-6Y BPMR8Y
Clean the electrodes with a wire brush and reset the gap to
0.65 mm as necessary.
5. Sprocket
Check for cracks and for excessive wear interfering with the
chain drive. If the wear is considerable, replace it with new
one. Never fit a new chain on a worn sprocket, or a worn chain
on a new sprocket.
6. Front and Rear dampers
Replace if adhered part is peeled or crack is observed on the
rubber part.
Place the file on the cutter and push straight forward.
Keep the file position as illustrated.
After each cutter has been filed, check the depth gauge
and file it to the proper level as illustrated.
Appropriate gauge checker
Champion NGK
Make the shoulder round
Depth gauge standard
21BP: .025" " " " " (0.64 mm)
33SL: .020" " " " " (0.51 mm)