Maintenance; General; Carburetor Adjustment; Checking, Maintaining And Servicing Chain Saw Safety Equipment - Husqvarna 455 Rancher II Manuel D'utilisation

General

The user must only carry out the maintenance and
service work described in this manual. More extensive
work must be carried out by an authorized service
workshop.

Carburetor adjustment

Your Husqvarna product has been designed and
manufactured to specifications that reduce harmful
emissions.
AutoTune
If the engine is equipped with AutoTune, manual
adjustment of the carburettor's H and L needles and the T-
screw no longer applies. Both needles and the T-screw
have been removed. AutoTune is a function that adjusts
the carburettor electronically, always resulting in optimal
adjustment.
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.
• The automatic adjustment of the carburettor means
that the engine is adapted to local conditions, e.g. the
climate, altitude, petrol and the type of 2-stroke oil.
This function is controlled by AutoTune.
Engine adjustment
The following steps should be taken when the chain saw
is started for the first time or when outside circumstances
change (fuel, altitude, air filter etc.):Start the engine.
Accelerate the engine and saw a number of cuts in a thick
log (3-5 min.).
The chain saw must be run (8,000 - 12,000 rpm) the entire
time so that the carburettor can adjust itself.
Conditions
NOTE! There is an integrated speed governor in the
ignition system that limits the maximum speed. When the
speed governor is activated, you will get the same sound
experience as when the chain saw 4-cycles.

MAINTENANCE

Checking, maintaining and
servicing chain saw safety
equipment
Note! All servicing and repair work on the machine
requires special training. This is especially true of the
machine's safety equipment. If your machine fails any of
the checks described below we recommend you to
contact our servicing dealer.
Chain brake and front hand guard
Checking brake band wear
Brush off any wood dust, resin and dirt from the chain
brake and clutch drum. Dirt and wear can impair operation
of the brake.
Regularly check that the brake band is at least 0.024 inch
(0,6 mm) thick at its thinnest point.
Checking the front hand guard
Make sure the front hand guard is not damaged and that
there are no visible defects such as cracks.
Move the front hand guard forwards and back to make
sure it moves freely and that it is securely anchored to the
clutch cover.
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English 33