Husqvarna 445 EPA III 用户手册

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115 13 81-96 Rev.3 2008-12-16

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Check the chain lubrication each time you refuel. See 
instructions under the heading Lubricating the bar tip 
sprocket.

Aim the tip of the bar at a light coloured surface about 
20 cm (8 inches) away. After 1 minute running at 3/4 
throttle you should see a distinct line of oil on the light 
surface.

If the chain lubrication is not working:

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Check that the oil channel in the bar is not obstructed. 
Clean if necessary.

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Check that the groove in the edge of the bar is clean. 
Clean if necessary.

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Check that the bar tip sprocket turns freely and that 
the lubricating hole in the tip sprocket is not blocked. 
Clean and lubricate if necessary.

If the chain lubrication system is still not working after 
carrying out the above checks and associated measures 
you should contact your servicing dealer.

The clutch drum is fitted with one of the following drive 
sprockets:

A   Spur sprocket (the chain sprocket is welded on the 
drum)

B   Rim sprocket (replaceable)

Regularly check the degree of wear on the drive sprocket. 
Replace if wear is excessive. Replace the drive sprocket 
whenever you replace the chain.

Both versions of sprockets have a needle bearing on the 
drive shaft, which has to be greased regularly (once a 
week). CAUTION! Use only high quality bearing grease or 
engine oil.

See instructions under the heading Maintenance, Needle 
bearing lubrication.

Check the chain daily for:

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Visible cracks in rivets and links.

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Whether the chain is stiff.

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Whether rivets and links are badly worn.

Replace the saw chain if it exhibits any of the points 
above.

We recommend you compare the existing chain with a 
new chain to decide how badly the existing chain is worn.

When the length of the cutting teeth has worn down to 
only 0.16 inch (4 mm) the chain must be replaced.