MAINTENANCE
General
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.
The user must only carry out the maintenance and service
work described in this manual.
IMPORTANT! Any maintenance other than that described
in this manual must be carried out by your servicing dealer
(retailer).
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.
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.
•
•
•
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.
H
L
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.
1
/2
1/2
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.
Your Husqvarna product has been designed and
manufactured to specifications that reduce harmful
emissions.
Fine adjustment of the idling speed T
Function
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 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 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:
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.
!
-
-
-
L = Low speed jet
H = High speed jet
T = Idle adjustment screw
H
L
High speed jet H
At the factory the engine is adjusted at sea level.When
working at a high altitude or in different weather
conditions, temperatures and atmospheric humidity, it
may be necessary to make minor adjustments to the high
speed jet.
T
•
•
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.
CAUTION! If the high speed jet is screwed in too far, it
may damage the piston/cylinder.
When test run at the factory, the high speed jet is set so that
the engine satisfies the applicable legal requirements at the
same time as achieving maximum performance. The
carburetor’s high speed jet is then locked using a limiter cap
in the fully screwed out position. The limiter cap limits the
potential to adjust the high speed jet to at most half a turn.
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.
Correctly adjusted carburetor
Basic settings and running in
When the carburetor is correctly adjusted the machine
accelerates without hesitation and the machine 4-cycles a
little at max.speed.It is also important that the chain does not
rotate at idle. If the L-jet is set too lean it may cause starting
difficulties and poor acceleration. If the H-jet is set too lean
the machine will have less power, poor acceleration and could
suffer damage to the engine.
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
English – 27
| Categories | Chainsaw Manuals, Husqvarna Chainsaw Manuals |
|---|---|
| Tags | Husqvarna 334T, Husqvarna 338XPT |
| Model Year | 2005, 2006, 2007, 2008, 2009 |
| 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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