Stihl FS 460 C, FS 460 C K Technical Information
STIH)
Technical Information
TI_40_2010_13_01_02.fm
englisch / English
New clearing saw STIHL FS 460 C – Series 4147
Contents
1. Overview
2. STIHL M-Tronic
3. Technical description
4. Specifications
5. Cutting attachments
6. Accessories
7. Service accessories
8. Spare parts
9. Servicing
FS 460 C FS 460 C K
40.2010
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The new clearing saw STIHL FS 460 C is the
newest member of the clearing saw line and, in
future, will be the follow-up model to the
STIHL FS 450.
The STIHL FS 460 C stands out because of the
following strengths:
– STIHL M-Tronic – optimal engine performance
at all times, see b 2
– Modern, low-emission 2-MIX engine
– High torque over a wide range of engine speeds
– Easy starting – fewer steps to start
– ErgoStart standard
– Functional, modern shape – outstanding
handling and ergonomics
– Very reliable and rugged
The new clearing saws are ideally suited for
professional users in landscaping and forestry.
Depending on the version, the scope of application
extends from mowing and thinning to mowing tough
grass, clearing scrub and thorny hedges, shredding
and sawing. The clearing saw STIHL FS 460 C with
a short drive tube is designed especially for use in
forests.
1. Overview
The new clearing saw STIHL FS 460 C is available
in various versions with varying features.
1.1 Versions with mowing handlebars
– Versions with varying drive tube lengths,
see b 4.4
– Drive tube diameter: 28 mm
– New, maintenance-free gearbox
– Gearhead angle 35°, see b 3.6.1, b 4.5
– New deflectors and limit stops,
see b 3.7.1, b 5.1
– New, 4-point anti-vibration system - very low
vibration levels, see b 3.8
– Can be used with the new PolyCut 41-3 mowing
head
– New universal harness ADVANCE included,
see b 3.9.1
1.2 Version with sawing handlebars for use
in forests
– Version with short drive tube, see b 4.4
– Drive tube diameter: 28 mm
– New, maintenance-free gearbox
– Gearhead angle 25°, see b 3.6.2
– New limit stops, see b 3.7.2, b 5.2
– New, 4-point anti-vibration system – very low
vibration levels, see b 3.8
– Only for sawing
– New forestry harness ADVANCE included,
see b 3.9.2
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2. STIHL M-Tronic
The FS 460 C is the first STIHL clearing saw to be
equipped with the innovative M-Tronic fully
electronic engine management system. It regulates
the ignition timing and electronically adjusts the fuel
flow, taking external conditions into account.
Electronic cold / warm start detection permits a
position "Start } " on the choke lever for starting the
engine and ensures easy starting with fewer pulls of
the starter rope. The very good acceleration is
realized using the electronic controller. By means of
the engine temperature and speed, the control unit
continually checks the operating state of the
clearing saw and adjusts the fuel flow so that
optimal engine power is always available. The
electronic memory (memory function) remembers
the settings from the last time the machine was
used. Thus if the machine is restarted under the
same general conditions, the full power of the
engine is available immediately.
According to the system of product names for
convenience features (C-versions), machines with
M-Tronic are denoted with an "M".
2.1 Functional description
2.2 Components
Control unit (1)
Control center for the optimum adjustment of fuel
flow, the exact ignition timing and the memory
function.
Second pair of poles (2)
Supplies power to the control unit and solenoid
valve
Wiring harness (3)
Connects control unit, solenoid valve, micro switch
(integrated in switch gear) and diagnostic jack
Solenoid valve (4)
Electronically switched solenoid valve adjusts the
overall fuel flow in milliseconds – this permits
adjustment from 0 % to 100 % fuel
Micro switch (5)
Reports the position of the choke shutter – start
detection;
the micro switch (5) is integrated in the switch gear
Diagnostic jack (6)
Preparation for a software-based diagnostic unit
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2.2.1 Starting
Set the choke lever to } (Start) – choke shutter is
closed. Simultaneously, the micro switch on the
switching device is closed. During starting and if the
engine is running, the control unit is powered via the
second pair of poles.
The following processes occur within the space of
milliseconds.
The microprocessor detects that the micro switch
has been actuated and thus the choke shutter is
closed and computes the necessary amount of fuel
and the ignition timing for the start.
During starting, the fuel-air mixture in the carburetor
is highly concentrated ("enriched") – a large quantity
of fuel flows through the solenoid valve. After initial
combustion, the quantity of fuel is reduced. The
engine does not stall out because the fuel-air
mixture is too rich; it keeps running and can be
accelerated immediately. After the throttle trigger is
actuated, the choke shutter and micro switch open
and the choke lever jumps to the operating
position F . The control unit receives the information
"choke shutter open" and the microprocessor
adjusts the amount of fuel.
2.2.2 Idle
The target idle speed is controlled by adjusting the
ignition timing and the fuel flow.
The engine speed can be influenced instantly by
adjusting the ignition timing. Changing the fuel flow
only influences the engine speed after 5 to
10 revolutions of the crankshaft.
For this reason, to establish steady idling, the
ignition timing is adjusted first and then the fuel flow.
The fuel flow control is designed so that the target
idle speed is attained with the target ignition timing.
2.2.3 Acceleration
If the control unit detects that the engine is being
accelerated, the ignition timing is set earlier and the
fuel flow is increased – the fuel-air mixture is
enriched. Optimal, spontaneous acceleration.
2.2.4 Full throttle
A regulating cycle only starts if the clearing saw is
operated for approximately 2 seconds under
constant conditions.
The solenoid valve closes for approx. 0.1 seconds –
the current fuel-air mixture is made leaner.
The speed change due to the brief leaning of the mix
is so slight as to be imperceptible to the user.
The resulting engine speed pattern is analyzed by
the microprocessor.
The following results are possible:
Engine speed increases
. The mix was too rich before the solenoid valve
closed – the fuel flow is reduced for next phase
of operation
Engine speed decreases
. The mix was too lean before the solenoid valve
closed – the fuel flow is increased for the next
phase of operation
Engine speed does not change
. The current carburetor setting is optimal – the
current setting will be maintained
2.2.5 Cut-off speed
The cut-off speed is kept constant by controling the
fuel-air mixture and the ignition timing.
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2.2.6 Advantages
Easy starting
With M-Tronic there is only one start position on the
choke lever because the system detects cold or
warm starts and electronically computes the exact
fuel flow. Starting with a few pulls of the starter rope
and immediate full throttle.
Permanent optimum engine performance
By means of the engine temperature and speed, the
control unit continually checks the operating state of
the clearing saw and adjusts the fuel flow for
constant optimum engine performance.
Very good acceleration
The FS 460 C accelerates spontaneously and
quickly by virtue of electronic ignition timing control
and fuel flow adjustment.
No manual carburetor adjustments
M-Tronic electronically adjusts the fuel-air mixture in
the carburetor: for all operating states such as start,
idle, part throttle and full throttle as well as taking
into account the external conditions, e. g., use at
varying altitudes, changing temperatures or fuel
quality (caloric value – energy content of the fuel,
alcohol content, knock resistance).
Memory function (electronic memory)
M-Tronic remembers, for an unlimited period of
time, the settings from the last time the clearing saw
was used and retrieves them the next time the
clearing saw is started. Thus full engine power is
available immediately each time the machine is
started under the same external conditions.
3. Technical description
3.1 Attaching the bicycle handle with
rotating handlebar support
The clamps are already attached to the handlebar at
the factory.
. Attaching the control handle
To assemble the rotating handlebar support, the
clamps must be fitted with a spring and fastened to
the handlebar support on the machine.
. Remove spring (1) from the set of parts included
with the machine
. Fit spring (1) in the lower clamp (2)
. Carry out further assembly in accordance with
Instruction Manual
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3.2 Operating elements
1 Throttle trigger lockout
2 Throttle trigger
3 Stop switch – with the positions for Run and
Stop. To switch off the engine, the stop switch
(STOP) must be pressed.
3.3 Stop switch function
When the stop switch is not actuated, it is in the
position Run: The ignition is switched on – the
engine is ready for starting and can be started. If the
stop switch is actuated, the ignition is switched off.
Once the engine comes to a standstill, the ignition is
automatically switched on again.
3.4 Choke lever
To start the engine, the choke lever (1) must be
pressed in at the edge (arrows) and rotated to the
position }. Once the engine has been started and
the throttle trigger lockout and throttle trigger have
been pressed, the choke lever automatically returns
to the position Run F
. It is not necessary to move the
choke lever to Run F by hand.
After a cold start, let the engine warm up with a few
load cycles.
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3.5 Summer and winter operation
3.5.1 At temperatures below +10 °C
Pre-heat carburetor
Moving a shutter causes heated air to be drawn in
from around the cylinder and mixed with cold air in
order to prevent carburetor icing.
An arrow on the shroud (1) shows the position of the
shutter (2) for summer or winter operation.
Key to symbols
Symbol "Sun" = summer operation
Symbol "Snowflake" = winter operation
. Unscrew and remove screw (3) on shutter
. Remove shutter (2) from the shroud
. Rotate shutter (2) from summer position to
winter position and reinsert
. Screw the screw (3) through the shutter into the
shroud
3.5.2 At temperatures between +10 °C and
+20 °C
Within this temperature range, the machine can
normally be operated with the shutter (2) in summer
position. Change the position of the shutter as
necessary.
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3.5.3 At temperatures above +20 °C
. Always return the shutter (2) to summer position
. Do not use the machine in winter operation at
temperatures above +20 °C, otherwise there is
a risk of engine damage due to overheating
3.5.4 At temperatures below -10 °C
Under extreme winter conditions with the following
conditions
– Temperatures below -10 °C
– Powdered or drifting snow
use of the "cover plate kit", which is available as a
special accessory, is recommended.
3.5.5 Cover plate kit
The "cover plate kit" contains the following parts for
covering the machine:
4 Cover plate for partially covering the slits in the
starter housing
5 Filter insert made of cloth and plastic for the air
filter
– O-ring for the filler cap
– Information sheet describing conversion of the
machine
After installation of the cover plate kit:
. Set shutter (2) to winter operation
. if the chain saw is extremely cold (frost
formation) – after starting, bring the engine up to
operating temperature at increased idle speed
(cutting attachment rotates!)
3.5.6 At temperatures above -10 °C
. Reconvert the machine and replace the parts
from the "cover plate kit" with the parts for
summer operation
The O-ring installed on the filler cap with the "cover
plate kit" can remain on the machine.
Depending on the ambient temperature:
. Set shutter to summer or winter operation
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3.6 Gearbox
3.6.1 Versions with standard drive tube and
long drive tube, see b 4.4
A new, maintenance-free gearbox with a gearhead
angle of 35° is used for the series FS 460 C in the
version with a standard drive tube and long drive
tube.
Gearhead angle 35°
3.6.2 Version with short drive tube, see b 4.4
A new, maintenance-free gearbox with a gearhead
angle of 25° is used for the series FS 460 C in the
version with a short drive tube and sawing
handlebars.
Gearhead angle 25°
3.7 New deflectors and limit stops
3.7.1 Versions with standard drive tube and
long drive tube, see b 4.4
The optimal deflector is available for each
application:
1 Deflector for mowing heads,
Diameter of cutting circle: 480 mm
2 Deflector for grass cutting blades and brush
knives
3 Deflector for shredder blade
4 Limit stop 200 mm for circular saw blades
5 Limit stop 225 mm for circular saw blades
All new deflectors and limit stops are fastened with
3 screws secured against loss.
For details about the approved deflectors and limit
stops, see b 5.1.
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