Fitting The Bar And Chain - Husqvarna 240 Operation Manual

GENERAL SAFETY PRECAUTIONS / ASSEMBLY
If the chain lubrication system is still not working after
carrying out the above checks and associated measures
you should contact your servicing dealer.
Chain drive sprocket
The clutch drum is fitted with a Spur sprocket (the chain
sprocket is welded on the drum).
Regularly check the degree of wear on the drive sprocket.
Replace if wear is excessive. Replace the drive sprocket
whenever you replace the chain.
Checking wear on cutting equipment
Check the chain daily for:
• Visible cracks in rivets and links.
• Whether the chain is stiff.
• 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.
Bar
Check regularly:
• Whether there are burrs on the edges of the bar.
Remove these with a file if necessary. (15)
• Whether the groove in the bar has become badly worn.
Replace the bar if necessary. (16)
• Whether the tip of the bar is uneven or badly worn. If a
hollow forms on the underside of the bar tip this is due
to running with a slack chain.
• To prolong the life of the bar you should turn it over daily.
WARNING! Most chain saw accidents
!
happen when the chain touches the
operator.
Wear personal protective equipment.
See instructions under the heading
Personal protective equipment.
Do not tackle any job that you feel you
are not adequately trained for. See
instructions under the headings
Personal protective equipment, How to
avoid kickback, Cutting equipment and
General working instructions.
Avoid situations where there is a risk of
kickback. See instructions under the
heading Machine's safety equipment.
Use the recommended protective
equipment and check its condition. See
instructions under the heading General
working instructions.
Check that all the chain saw safety
features are working. See instructions
under the headings General working
instructions and General safety
precautions.
5451546-92 Rev.3 2007-12-19

Fitting the bar and chain

WARNING! Switch off the engine before
!
carrying out any checks or maintenance.
The stop switch automatically returns to
the start position. In order to prevent
unintentional starting, the spark plug
cap must be removed from the spark
plug when assembling, checking and/or
performing maintenance.
Always wear gloves, when working with
the chain, in order to protect your hands
from injury.
Check that the chain brake is in disengaged position by
moving the front hand guard towards the front handle.
Remove the knob and remove the clutch cover (chain
brake). Take off the transportation ring. (17)
Fit the bar over the bar bolts. Place the bar in its rearmost
position. Place the chain over the drive sprocket locate it in
the groove on the bar. Begin on the top edge of the bar.
(18)
Make sure that the edges of the cutting links are facing
forward on the top edge of the bar.
Fit the clutch cover (chain brake) and locate the chain
adjuster pin in the cut-out in the bar. Check that the drive
links of the chain fit correctly on the drive sprocket and that
the chain is in the groove on the bar. (19)
Tension the chain by turning the wheel down (+). The chain
should be tensioned until it does not sag from the
underside of the bar. (12)
The chain is correctly tensioned when it does not sag from
the underside of the bar, but can still be turned easily by
hand. Hold up the bar tip and tighten the bar knob by
turning the knob clockwise. (13)
When fitting a new chain, the chain tension has to be
checked frequently until the chain is run-in. Check the
chain tension regularly. A correctly tensioned chain
ensures good cutting performance and long life. (20)
English – 13