Fueling & Lubrication; Chain Tension - Husqvarna 137, 142 Instruction Manual

Place chain onto the sprocket
8. Fit bottom of drive links between the
teeth in the sprocket in the nose of the
guide bar.
9. Fit chain drive links in bar groove.
10. Pull the bar forward until the chain is
snug in the guide bar groove. Ensure all
drive links are in the bar groove.
11. Now, install chain brake making sure the
adjusting pin is positioned in the lower
hole in the guide bar. Remember this pin
moves the bar forward and backward as
the screw is turned.
12. Install chain brake nuts and finger tighten
only. Once the chain is tensioned, you
will need to tighten chain brake nuts.

CHAIN TENSION

(Including units with
chain already installed)
NOTE:
When adjusting chain tension,
make sure the chain brake nuts are finger
tight only. Attempting to tension the chain
when the chain brake nuts are tight can
cause damage.
Checking the tension:
Use the screwdriver end of the chain adjust-
ment tool (bar tool) to move the chain around
the bar. If the chain does not rotate, it is too
tight. If too loose, the chain will sag below the
bar.
Chain Adjustment
Chain Brake Nuts
Tool (Bar Tool)
FUELING & LUBRICATION
FUELING ENGINE
WARNING:
Remove fuel cap slow-
ly when refueling.
This engine is certified to operate on
unleaded gasoline. Before
gasoline must be mixed with a good quality
2-cycle air-cooled engine
recommend HusqvarnaR brand oil. If you do
not use this oil, use a good quality 2-cycle
air-cooled oil designed to be mixed at a ratio
of 40:1. A 40:1 ratio is obtained by mixing
0,125 liter of oil with 5 liters of unleaded
gasoline. DO NOT USE automotive or boat
oil. These oils will cause engine damage.
Adjusting the tension:
Chain tension is very important.
stretches during use. This is especially true
during the first few times you use your saw.
Always check chain tension each time you
use and refuel your saw.
You can adjust the chain tension by
loosening the chain brake nuts and turning
the adjusting screw 1/4 of a turn while lifting
up on the bar.
S If chain is too tight, turn adjusting screw 1/4
turn counterclockwise.
S If chain is too loose, turn adjusting screw
1/4 turn clockwise.
Chain Brake Nuts
Adjusting Screw - - 1/4 Turn
S Lift up the tip of the bar and tighten the
chain brake nuts with the bar tool.
S Recheck chain tension.
WARNING:
with a loose chain, the chain could jump off
the guide bar and result in serious injury.
WARNING:
ing and after use. Do not touch the muffler or
allow combustible material such as dry
grass or fuel to do so.
When mixing fuel follow the instructions
printed on the container. Always read and
follow the safety rules listed under HANDLE
FUEL WITH CAUTION.
IMPORTANT
operation, Experience indicates that alcohol blended fuels
(called gasohol or using ethanol or methanol)
oil. We can attract moisture which leads to separation
and formation of acids during storage. Acidic
gas can damage the fuel system of an engine
while in storage. To avoid engine problems,
empty the fuel system before storage for 30
days or longer. Drain the gas tank, start the
engine and let it run until the fuel lines and
carburetor are empty. Use fresh fuel next
7
Chain
Adjusting screw
Chain Brake
Nuts
If the saw is operated
Muffler is very hot dur-