To Examine The Cutting Equipment For Wear; To Do A Check Of The Guide Bar; Cooling System; Centrifugal Cleaning System - Zenoah GZ381 Manual De Usuario

If the saw chain lubrication does not work after
completing the steps above, turn to your servicing
dealer.
To do a check of the chain drive sprocket
The clutch drum has a spur sprocket (A) or a rim
sprocket (B). A spur sprocket has the chain sprocket
permanently attached to the clutch drum. A rim sprocket
can be replaced.
(Fig. 124)
• Regularly examine the chain drive sprocket for wear.
Replace the chain drive sprocket if there is too much
wear.
• Replace the chain drive sprocket when you replace
the saw chain.
To lubricate the needle bearing
Both versions of sprockets have a needle bearing on the
drive shaft, which has to be greased regularly (once a
week).
1. Disengage the chain brake by pulling the front hand
guard against the front handle.
2. Unscrew the two bar nuts and remove the clutch
cover.
3. Lay the product on its side with the clutch drum
facing upwards.
4. Remove the clutch drum and lubricate the needle
bearing using a grease gun. Use a high-quality
bearing grease or engine oil. (Fig. 125)
To examine the cutting equipment
for wear
Do a visual check of the saw chain daily.
1. Make sure that there are no visible cracks in rivets
and links.
2. Examine wheather the saw chain is stiff.
3. Compare the existing saw chain with a new saw
chain to decide wheather the rivets and links are
badly worn.
4. Replace the saw chain if it exhibits any of the
conditions above.
5. Replace the saw chain when the length of the cutting
teeth has worn down to only 4 mm.

Maintenance schedule

The following is a list of the maintenance steps that must
be performed on the product. Most of the items are
Maintenance on page 30
described in
Daily maintenance
Clean the outside of the machine.
272 - 008 -

To do a check of the guide bar

Do a check of the guide bar regularly.
1. Examine whether there are burrs on the edges of the
2. Examine whether the groove in the bar has become
3. Examine whether the tip of the bar is uneven or
4. Turn the bar daily to prolong the life of the bar.

Cooling system

The product is equipped with a cooling system to keep
the working temperature as low as possible. The cooling
system consist of the following components:
•
•
•
•
•
(Fig. 126)
Clean the cooling system with a brush once a week or
more often in demanding conditions. A dirty or blocked
cooling system causes the product to overheat which
results in damage to the piston and cylinder.

Centrifugal cleaning system

Centrifugal cleaning means that the air to the carburettor
passes through the starter. Dirt and dust is centrifuged
out by the cooling fan.
(Fig. 127)
In order to maintain operation of the centrifugal cleaning
system it must be regularly maintained. Clean the
following components:
•
•
•
•
•
Weekly maintenance
Check the cooling system weekly.
bar. Remove burrs with a file if necessary.
badly worn. Replace the bar if necessary.
badly worn. If a hollow forms on the underside of the
bar tip this is due to running with a slack chain.
Air intake on the starter.
Air guide plate.
Fins on the flywheel.
Cooling fins on the cylinder.
Cylinder cover (directs cool air over the cylinder).
The air intake on the starter.
The fins on the flywheel.
The space around the flywheel.
The inlet pipe.
The carburettor compartment.
Monthly maintenance
Check the brake band on the chain
brake for wear. Replace when less
than 0.6 mm (0.024 inch) remains at
the most worn point.
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