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Cutting equipment
This section describes how to choose and maintain your
cutting equipment in order to:
•
Reduce the risk of kickback.
•
Reduce the risk of the saw chain breaking or jumping
off the bar.
•
Obtain optimal cutting performance.
•
Extend the life of cutting equipment.
•
Avoid increasing vibration levels.
General rules
•
Only use cutting equipment recommended by us!
See instructions under the heading Technical data.
•
Keep the chain's cutting teeth properly
sharpened! Follow our instructions and use the
recommended file gauge. A damaged or badly
sharpened chain increases the risk of accidents.
•
Maintain the correct depth gauge setting! Follow
our instructions and use the recommended
depth gauge clearance. Too large a clearance
increases the risk of kickback.
•
Keep the chain properly tensioned! If the chain is
slack it is more likely to jump off and lead to
increased wear on the bar, chain and drive sprocket.
•
Keep cutting equipment well lubricated and
properly maintained! A poorly lubricated chain is
more likely to break and lead to increased wear on
the bar, chain and drive sprocket.
Cutting equipment designed to reduce
kickback
WARNING! Faulty cutting equipment or
!
the wrong combination of bar and saw
chain increases the risk of kickback!
Only use the bar/saw chain
combinations we recommend, and
follow the filing instructions. See
instructions under the heading
Technical data.
The only way to avoid kickback is to make sure that the
kickback zone of the bar never touches anything.
By using cutting equipment with "built-in" kickback
reduction and keeping the chain sharp and well-
maintained you can reduce the effects of kickback.
Bar
The smaller the tip radius the lower the chance of
kickback.
Chain
A chain is made up of a number of links, which are
available in standard and low-kickback versions.
IMPORTANT! No saw chain design eliminates the
danger of kickback.
WARNING! Any contact with a rotating
!
saw chain can cause extremely serious
injuries.
5451868-53 Rev. 2 2008-12-19
GENERAL SAFETY PRECAUTIONS
Some terms that describe the bar and chain
To maintain the safety features of the cutting equipment,
you should replace a worn or damaged bar or chain with a
bar and chain combinations recommended by Jonsered.
See instructions under the heading Technical Data for a list
of replacement bar and chain combinations we recommend.
Bar
•
Length (inches/cm)
•
Number of teeth on bar tip sprocket (T).
•
Chain pitch (inches). The spacing between the drive
links of the chain must match the spacing of the teeth
on the bar tip sprocket and drive sprocket.
•
Number of drive links. The number of drive links is
determined by the length of the bar, the chain pitch
and the number of teeth on the bar tip sprocket.
•
Bar groove width (inches/mm). The groove in the bar
must match the width of the chain drive links.
•
Chain oil hole and hole for chain tensioner. The bar
must be matched to the chain saw design.
Chain
•
Chain pitch (inches)
•
Drive link width (mm/inches)
•
Number of drive links.
Sharpening your chain and adjusting
depth gauge setting
WARNING! Always wear gloves, when
!
working with the chain, in order to
protect your hands from injury.
General information on sharpening cutting teeth
•
Never use a blunt chain. When the chain is blunt you
have to exert more pressure to force the bar through
the wood and the chips will be very small. If the chain
is very blunt it will produce wood powder and no
chips or shavings.
•
A sharp chain eats its way through the wood and
produces long, thick chips or shavings.
•
The cutting part of the chain is called the cutter and
consists of a cutting tooth (A) and the depth gauge
(B). The cutters cutting depth is determined by the
difference in height between the two (depth gauge
setting). (7)
When you sharpen a cutting tooth there are four
important factors to remember.
1
Filing angle
2
Cutting angle
3
File position
4
Round file diameter
It is very difficult to sharpen a chain correctly without the
right equipment. We recommend that you use our file
gauge. This will help you obtain the maximum kickback
reduction and cutting performance from your chain.
See instructions under the heading Technical data for
information about sharpening your chain.
WARNING! Departure from the
!
sharpening instructions considerably
increases the risk of kickback.
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