MAINTENANCE
Carburettor
Fine adjustment
When the saw has been ”run-in” the carburettor should be
finely adjusted.The fine adjustment should be carried out by
qualified person. The L-needle is adjusted first, then the idling
screw T.
Your Husqvarna product has been designed and
manufactured to specifications that reduce harmful
emissions. After the engine has used 8-10 tanks of fuel the
engine will be run-in.To ensure that it continues to run at peak
performance and to minimise harmful exhaust emissions
after the running-in period, ask your dealer/service workshop
(who will have a rev counter at their disposal) to adjust your
carburettor.
Conditions
•
Before any adjustments are made the air filter should be
clean and the cylinder cover fitted. Adjusting the
carburettor 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.
Function, Basic settings, Fine adjustment
WARNING! Do not start the chain saw unless
the bar, chain and clutch cover (chain brake)
are fitted, otherwise the clutch may come
loose and cause personal injury.
!
•
•
Turn the low speed jet carefully clockwise until it bottoms.
Now turn it one turn anti-clockwise.The carburettor is now
set to L = 1.
Now start the machine according to the starting
instructions and let it warm up for 10 minutes. CAUTION!
If the chain rotates while idling the T-screw must be
turned anti-clockwise until the chain stops.
Function
•
The carburettor governs the engine’s speed via the
throttle control. Air and fuel are mixed in the carburettor.
The air/fuel mixture is adjustable. Correct adjustment is
essential to get the best performance from the machine.
•
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.
•
•
The setting of the carburettor means that the engine is
adepted to local conditions, for example, the climate,
altitude, fuel and the type of 2-stroke oil.
Low speed jet L
+ 1/4
The carburettor has two adjustment controls:
-
-
L = Low speed jet
T = Idle adjustment screw (Maximum speed is
controlled by a fixed jet/electronic speed governor).
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.
CAUTION! If the chain rotates while idling the T-screw
must be turned anti-clockwise until the chain stops.
•
•
The amount of fuel that is mixed with the air admitted by
the throttle opening is adjusted using the low speed jet. If
this is turned clockwise it gives a leaner air/fuel mixture
(less fuel) and if it is turned anti-clockwise it gives a richer
air/fuel mixture (more fuel). A leaner mixture gives a
higher engine speed, while a richer mixture gives a lower
engine speed.
Final setting of the idling speed T
Adjust the idle speed with the T-screw. If it is necessary to re-
adjust, turn theT-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.
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.
WARNING! Contact your servicing dealer, if
the idle speed setting cannot be adjusted so
that the chain stops. Do not use the chain
saw until it has been properly adjusted or
repaired.
!
Basic settings and running in
The basic carburettor settings are adjusted during testing 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 chain rotate while idling the T screw should be
adjusted counter-clockwise until it stops.
Recommended idling speed: 2 500 rpm.
English – 29
| Categories | Chainsaw Manuals, Husqvarna Chainsaw Manuals |
|---|---|
| Tags | Husqvarna 3120XP |
| Model Year | 2001, 2002, 2003, 2004 |
| Download File |
|
| Document Type | Operator's Manual |
| Language | English |
| Product Brand | Husqvarna, Chainsaw |
| Document File Type | |
| Publisher | husqvarna.com |
| Wikipedia's Page | Husqvarna |
| Copyright | Attribution Non-commercial |
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