Husqvarna 1151438-95, Руководство оператора

Страница: 31 / 44

MAINTENANCE
English
–
31
General
The user must only carry out the maintenance and service
work described in this manual.
Carburetor adjustment
Due to existing environmental and emissions legislation your
chain saw is equipped with movement limiters on the
carburetor adjuster screws. These limit the adjustment
possibilities to a maximum of a 1/2 turn.
Your Husqvarna product has been designed and
manufactured to specifications that reduce harmful
emissions.
Function
• The carburetor governs the engine’s speed via the
throttle control. Air and fuel are mixed in the carburetor.
The air/fuel mixture is adjustable. Correct adjustment is
essential to get the best performance from the machine.
• The satisfactory operation of a catalytic converter
depends, among other factors, on the correct adjustment
of the carburetor. Carefully follow the instructions below,
using a tachometer as an aid.
• The setting of the carburetor means that the engine is
adapted to local conditions, for example, the climate,
altitude, fuel and the type of 2-stroke oil.
• The carburetor has three adjustment controls:
- L = Low speed jet
- H = High speed jet
- T = Idle adjustment screw
• The L and H-jets are used to adjust the supply of fuel to
match the rate that air is admitted, which is controlled
with the throttle. If they are screwed clockwise the air/fuel
ratio becomes leaner (less fuel) and if they are turned
anti-clockwise the ratio becomes richer (more fuel). A
lean mixture gives a higher engine speed and a rich
mixture gives a lower engine speed.
• The T-screw regulates the throttle setting at idle speed. If
the T-screw is turned clockwise this gives a higher idle
speed; turning it anti-clockwise gives a lower idle speed.
Basic settings and running in
The basic carburetor settings are adjusted during testing at
the factory. Avoid running at a too high speed for extended
periods during the first 10 hours.
CAUTION! If the chain rotates while idling the T-screw
must be turned anti-clockwise until the chain stops.
Rec. idle speed: 2700 rpm
Fine adjustment
When the machine has been ”run-in” the carburetor should
be finely adjusted. The fine adjustment should be carried
out by a qualified person. First adjust the L-jet, then the
idling screw T and then the H-jet.
Conditions
• Before any adjustments are made the air filter should be
clean and the cylinder cover fitted. Adjusting the
carburetor while a dirty air filter is in use will result in a
leaner mixture next time the filter is cleaned. This can
give rise to serious engine damage.
• Do not attempt to adjust the L and H jets beyond
either stop as this could cause damage.
• Now start the machine according to the starting
instructions and let it warm up for 10 minutes.
• Place the machine on a flat surface so that the bar points
away from you and so that the bar and chain do not come
into contact with the surface or other objects.
Low speed jet L
Turn the low speed jet L clockwise until it stops. If the engine
accelerates poorly or idles unevenly, turn the low speed jet L
anticlockwise until good acceleration and idling are
achieved.
Fine adjustment of the idling speed T
Adjust the idle speed with the T-screw. If it is necessary to re-
adjust, turn the T-screw clockwise while the engine is
running, until the chain starts to rotate. Then turn counter-
clockwise until the chain stops. A correctly adjusted idle
speed setting occurs when the engine runs smoothly in
every position. It should also be good margin to the rpm
when the chain starts to rotate.
IMPORTANT! Any maintenance other than that described
in this manual must be carried out by your servicing dealer
(retailer).
1/2
1/2
H
L
L H
T
!
WARNING! Contact your servicing dealer, if
the idle speed setting cannot be adjusted
so that the chain stops at idle. Do not use
the chain saw until it has been properly
adjusted or repaired.