Husqvarna 455e Rancher 用户手册
32 –
English
MAINTENANCE
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.
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.
CAUTION! If the high speed jet is screwed in too far, it
may damage the piston/cylinder.
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 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.
To adjust the carburetor correctly you should contact a
mechanic with access to a rev counter.
mechanic with access to a rev counter.
CAUTION! As the spark is cut off, the rev counter does not
show speeds higher than 13600 rpm.
show speeds higher than 13600 rpm.
Correctly adjusted carburetor
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.
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.
Checking, maintaining and servicing
chain saw safety equipment
chain saw safety equipment
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.
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.
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.
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.
moves freely and that it is securely anchored to the clutch
cover.
Checking the inertia brake release
With the engine turned off, hold the chain saw over a stump
or other firm object. Let go of the front handle so that the bar
drops towards the stump as the chain saw rotates around the
rear handle.
or other firm object. Let go of the front handle so that the bar
drops towards the stump as the chain saw rotates around the
rear handle.
When the bar hits the stump the brake should be applied.
Note! All servicing and repair work on the machine requires
special training. This is especially true of the machine
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.
described below we recommend you to contact our
servicing dealer.