Maintenance of saw chain and guide bar – Zenoah GZ400 User Manual

Page 13

GZ400

GB-13

■ Saw Chain

t 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:

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:

Carlton

N1C-BL-M-57E SK

File size:

5/32 in (1.6 mm)

Place the file on the cutter and push straight forward. Keep the
file position as illustrated.

4. Fuel filter

(a) Using a wire hook, take out the filter from the filler port.

(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 filter fibers or dust

inside the suction pipe.

5. Spark plug

Clean the electrodes with a wire brush and reset the gap to
0.65 mm as necessary.

6. 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.

After each cutter has been filed, check the depth gauge and
file it to the proper level as illustrated.

8. Maintenance of Saw Chain and Guide Bar

Appropriate gauge checker

Make the shoulder round

Depth gauge standard

.025

″ (0.64 mm)

Muffler exhaust vent

Cylinder exhaust port

Fuel filter

• Champion RZ7C

Spark arrester

Note: Be sure to block the air intake hole.

2. Spark arrester

The muffler is equipped with a spark arrester to prevent red hot
carbon from flying out of the exhaust outlet. Periodically check
and clean as necessary with a wire brush after removing two
muffler cover nuts and one screw.

Note: Never use a muffler if the spark arrester is missing or defective.

3. Exhaust port

Remove the muffler, insert a screwdriver into the vent, and wipe
away any carbon buildup after every 100 hours of use. Wipe
away any carbon buildup on the muffler exhaust vent and the
cylinder exhaust port at the same time.