Husqvarna 326HD60 - Manual (Page 14)

14
– English
MAINTENANCE
Carburetor
Your Husqvarna product has been designed and manufactured
to specifications that reduce harmful emissions.
After your unit has been run 8-10 tanks of fuel the engine has
broken in. To ensure that your unit is at peak performance and
producing the least amount of harmful emissions after break
in, have your authorized servicing dealer, who has a revolution
counter at his disposal, to adjust your carburetor for optimum
operating conditions.
Basic setting
• The carburetor is set to its basic setting when test run at the
factory. The basic setting is richer than the optimal setting
and should be kept during the machine’s first working
hours. Thereafter the carburetor should be finely adjusted.
Fine adjustment should be carried out by a skilled
technician.
NOTE! If the blades move while the engine is idling the T
screw should be turned anti-clockwise until they stop.
Recommended idling speed is: 2 700 rpm.
Recommended max. speed: See “technical data”.
Operation
• The carburetor governs
the engine’s speed via the
throttle. Air/fuel is mixed
in the carburetor. The
air/fuel mixture is
adjustable. To take
advantage of the engine’s
optimal output the
adjustment must be
correct.
• The setting of the
carburetor means that
the engine is adapted to
local conditions, for
example, the climate,
altitude, gasoline and the
type of 2-stroke oil.
• The carburetor is equipped with three adjustment possibili-
ties:
H = High speed needle
L = Low speed needle
T = Idle speed adjuster screw
• The fuel quantity in relation to the air flow permitted by
the throttle opening is adjusted using the L and H-needles.
Turning the needles clockwise gives a leaner fuel mixture
(less fuel) and turning them anti-clockwise gives a richer
fuel mixture (more fuel). A leaner mixture gives high revs
while a richer mixture give less revs.
• The T-screw regulates the position of the throttle while the
engine is idling. Turning the screw clockwise gives a higher
idling speed while turning it anti-clockwise gives a lower
idling speed.
T
Adjusting the idle speed, T
Adjust the idling speed with
the screw T, if it is necessary
to readjust. First turn the
idle speed adjusting screw T
clockwise until the cutting
attachment starts to rotate/
move.
Then turn, counter-
clockwise until the cutting
attachment stops. A correctly
adjusted idle speed setting
occurs when the engine runs
smoothly in every position.
The idle speed should also be
well below the speed at
which the blades start to
move.
CAUTION! Contact your servicing dealer, if the idle speed
setting cannot be adjusted so that the cutting attachment
stops. Do not use the machine until it has been properly
adjusted or repaired.
Correctly adjusted carburetor
A correctly adjusted carburetor means that the machine
accelerates without hesitation and the machine 4-cycles a little
at max speed. The blades should not move when the engine is
idling or when the choke control is in the start position. A too
lean adjusted low speed needle L may cause starting difficulties
and bad acceleration.
A too lean adjusted high speed needle H gives lower power =
less capacity, bad acceleration and/or damage to the engine.
A too rich adjustment of the two speed needles L and H gives
acceleration problems or too low working speed.
WARNING!
The blades must be fitted before the
hedge trimmer is started, otherwise the
clutch can become loose and cause
personal injury.
!
WARNING!
If the idling speed cannot be adjusted so
that the cutting attachment stops,
contact your service workshop. Do not
use the machine until it has been
correctly adjusted or repaired.
!