Jonsered 2149 - Manual (Page 11)

English –
11
!
SAFETY INSTRUCTIONS
C Some terms that describe the bar and chain
When the cutting equipment supplied with your saw becomes
worn or damaged you will need to replace it. Use only the type
of bar and chain recommended by us. See the
”Technical data”
section to find out which equipment is recommended for your
saw.
Bar
• LENGTH (inches/cm)
• NUMBER OF TEETH ON
BAR TIP SPROCKET (T).
Small number = small tip
radius = low-kickback
• 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.
• SAW CHAIN OIL HOLE
AND HOLE FOR CHAIN
TENSIONER
The bar must be matched to
the chain saw design.
Saw chain
• SAW CHAIN PITCH
(inches)
Spacing between drive
links.
• DRIVE LINK WIDTH (mm/
inches)
• NUMBER OF DRIVE LINKS
• LEVEL OF KICKBACK
REDUCTION
The level of kickback
reduction offered by a chain
is indicated by its model
number.
See the
”Technical data”
section to find the model
numbers of chains that are
recommended for use with
your saw.
1 Cutting equipment designed to minimise
kickback
Faulty cutting equipment or the wrong
combination of bar and chain increases the
risk of kickback. Use only the bar and chain
combinations recommended in the
”Technical
data” section.
The only way to avoid kickback is to make sure that the kick-
back zone of the bar never touches anything.
By using cutting equipment with “built-in” kickback protection
and keeping the chain sharp and well-maintained you can
reduce the effects of kickback.
A Bar
The smaller the tip radius the
smaller the kickback zone and
the lower the chance of
kickback.
B Saw chain
A saw chain is made up of a number of links, which are
available in standard and low-kickback versions.
None Standard Low-kickback
CUTTING LINK
DRIVE LINK
SIDE LINK
Combining these links in different ways gives different degrees
of kickback reduction. In terms of kickback reduction alone, four
different types of link are available.
Kickback reduction Cutting link Drive link Side link
LOW
STANDARD
HIGH
EXTRA HIGH