Technical Information · issue 40 of 2010
New brushcutter/clearing saw STIHL FS 460 C - EM
IssueTI 40/2010
Full text
Page 1 of 28
STIH)
Technical Information 40.2010
New brushcutter/clearing saw
STIHL FS 460 C - EM – Series 4147
Contents
1. STIHL M-TronicTM
2. Technical description
3. Specifications
4. Cutting attachments
5. Accessories
6. Service accessories
7. Spare parts
8. Servicing
The new clearing saw STIHL FS 460 C - EM is the
newest member of the clearing saw line and will
replace the STIHL FS 450.
The STIHL FS 460 C - EM stands out because of
the following strengths:
– STIHL M-TronicTM – optimal engine
performance at all times, see b 1
– Modern, low-emission engine
– High torque over a wide range of engine speeds
– Simplified starting – fewer steps to start
– Standard with Easy2StartTM
– Functional, modern shape – outstanding
handling and ergonomics
– Very reliable and rugged
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)m~ge 2 Technical Information 40.2010
The new clearing saw is ideally suited for 1.1 Functional description
professional users in landscaping and forestry. The
scope of application extends from mowing and
thinning to mowing tough grass, clearing scrub and 1.2 Components
thorny hedges, shredding and sawing.
1 4
Features
– Version with mowing handlebar
– Drive tube diameter: 28 mm 3
– New, maintenance-free gearbox 5
– Gearhead angle 35°, see b 2.6, b 3.5
– New deflectors and limit stops, see b 2.7, b 4 2
5903TI001 KN
– New, 4-point anti-vibration system - very low 6
vibration levels, see b 2.8
– Can be used with the new PolyCutTM 41-3 Control unit (1)
mowing head Control center for the optimum adjustment of fuel
– New universal harness included, see b 2.9 flow, the exact ignition timing and the memory
function.
Second pair of poles (2)
1. STIHL M-TronicTM Supplies power to the control unit and solenoid
valve
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 Wiring harness (3)
the ignition timing and electronically adjusts the fuel
Connects control unit, solenoid valve, micro switch
flow, taking external conditions into account.
(integrated in switch gear) and diagnostic jack
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 Solenoid valve (4)
the starter rope. The very good acceleration is Electronically switched solenoid valve adjusts the
optimized using the electronic controller. By means overall fuel flow in milliseconds – this permits
of the engine temperature and speed, the control adjustment from 0 % to 100 % fuel
unit continually checks the operating state of the
clearing saw and adjusts the fuel flow so that
optimal engine power is always available. The Micro switch (5)
electronic memory (memory function) remembers
the settings from the last time the machine was Reports the position of the choke shutter – start
used. Thus if the machine is restarted under the detection;
same general conditions, the full power of the the micro switch (5) is integrated in the switch gear
engine is available immediately.
According to the system of product names for Diagnostic jack (6)
convenience features (C-versions), machines with
Preparation for a software-based diagnostic unit
STIHL M-TronicTM are denoted with an "M".
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Technical Information 40.2010 Page 3
1.2.1 Starting 1.2.3 Acceleration
Set the choke lever to } (Start) – choke shutter is If the control unit detects that the engine is being
closed. Simultaneously, the micro switch on the accelerated, the ignition timing is set earlier and the
switching device is closed. During starting and if the fuel flow is increased – the fuel-air mixture is
engine is running, the control unit is powered via the enriched. Optimal, spontaneous acceleration.
second pair of poles.
The following processes occur within milliseconds.
1.2.4 Full throttle
The microprocessor detects that the micro switch
has been actuated and thus the choke shutter is A regulating cycle only starts if the clearing saw is
closed and computes the necessary amount of fuel operated for approximately 2 seconds under
and the ignition timing for the start. constant conditions.
During starting, the fuel-air mixture in the carburetor The solenoid valve closes for approx. 0.1 seconds –
is highly concentrated ("enriched") – a large quantity the current fuel-air mixture is made leaner.
of fuel flows through the solenoid valve. After initial The speed change due to the brief leaning of the mix
combustion, the quantity of fuel is reduced. The is so slight as to be unnoticable to the user.
engine does not stall out because the fuel-air
mixture is too rich; it keeps running and can be The resulting engine speed pattern is analyzed by
accelerated immediately. After the throttle trigger is the microprocessor.
actuated, the choke shutter and micro switch open
and the choke lever jumps to the operating
position F . The control unit receives the information The following results are possible:
"choke shutter open" and the microprocessor Engine speed increases
adjusts the amount of fuel.
. The mix was too rich before the solenoid valve
closed – the fuel flow is reduced for next phase
of operation
1.2.2 Idle
Engine speed decreases
The target idle speed is controlled by adjusting the
. The mix was too lean before the solenoid valve
ignition timing and the fuel flow.
closed – the fuel flow is increased for the next
The engine speed can be influenced instantly by phase of operation
adjusting the ignition timing. Changing the fuel flow
Engine speed does not change
only influences the engine speed after 5 to
10 revolutions of the crankshaft. . The current carburetor setting is optimal – the
current setting will be maintained
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 obtained with the target ignition timing. 1.2.5 Cut-off speed
The cut-off speed is kept constant by controling the
fuel-air mixture and the ignition timing.
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)m~ge 4 Technical Information 40.2010
1.2.6 Advantages 2. Technical description
Simplified starting
2.1 Attaching the bicycle handle with
With M-TronicTM there is only one start position on rotating handlebar support
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 The clamps are already attached to the handlebar at
and immediate full throttle. the factory.
. Attaching the control handle
Permanent optimum engine performance To assemble the rotating handlebar support, the
By means of the engine temperature and speed, the clamps must be fitted with a spring and fastened to
control unit continually checks the operating state of the handlebar support on the machine.
the clearing saw and adjusts the fuel flow for
constant optimum engine performance. 1
Very good acceleration
The FS 460 C accelerates spontaneously and
quickly by virtue of electronic ignition timing control 2
and fuel flow adjustment.
317TI003 KN
No manual carburetor adjustments
M-TronicTM electronically adjusts the fuel-air
mixture in the carburetor: for all operating conditions . Remove spring (1) from the set of parts included
such as start, idle, part throttle and full throttle as with the machine
well as taking into account the external conditions, . Fit spring (1) in the lower clamp (2)
e. g., use at varying altitudes, changing
temperatures or fuel quality (caloric value – energy . Carry out further assembly in accordance with
content of the fuel, alcohol content, knock Instruction Manual
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.
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Technical Information 40.2010 Page 5
2.2 Operating elements 2.4 Choke lever
5903TI002 KN
2
To start the engine, the choke lever (1) must be
pressed in at the edge (arrows) and rotated to the
1 position }. Once the engine has been started and
the throttle trigger lockout and throttle trigger have
317TI005 KN
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.
1 Throttle trigger lockout After a cold start, let the engine warm up with a few
2 Throttle trigger load cycles.
3 Stop switch – with the positions for Run and
Stop. To switch off the engine, the stop switch
(STOP) must be pressed.
2.3 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 completely stops, the ignition is
automatically switched on again.
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)m~ge 6 Technical Information 40.2010
2.5 Summer and winter operation
3
2.5.1 At temperatures below +50 °F (+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. 2
317TI009 KN
1 . Unscrew and remove screw (3) on shutter
317TI008 KN
. Remove shutter (2) from the shroud
. Rotate shutter (2) from summer position to
An arrow on the shroud (1) shows the position of the winter position and reinsert
shutter (2) for summer or winter operation.
. Screw the screw (3) through the shutter into the
shroud
Key to symbols
Symbol "Sun" = summer operation
2.5.2 At temperatures between +50 °F (+10 °C)
Symbol "Snowflake" = winter operation and +70 °F (+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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Technical Information 40.2010 Page 7
2.5.3 At temperatures above +70 °F (+20 °C) 2.5.5 Cover plate kit
2
2
317TI010 KN
317TI011 KN
4
The "cover plate kit" contains the following parts for
. Always return the shutter (2) to summer position
covering the machine:
. Do not use the machine in winter operation at
4 Cover plate for partially covering the slits in the
temperatures above +70 °F (+20 °C), otherwise
starter housing
there is a risk of engine damage due to
5 Filter insert made of cloth and plastic for the air
overheating
filter
– O-ring for the filler cap
– Information sheet describing conversion of the
2.5.4 At temperatures below +14 °F (-10 °C)
machine
Under extreme winter conditions with the following
conditions
– Temperatures below +14 °F (-10 °C) After installation of the cover plate kit:
. Set shutter (2) to winter operation
– Powdered or drifting snow
. if the clearing saw is extremely cold (frost
use of the "cover plate kit", which is available as a
formation) – after starting, bring the engine up to
special accessory, is recommended.
operating temperature at increased idle speed
(cutting attachment rotates!)
2.5.6 At temperatures above +14 °F (-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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)m~ge 8 Technical Information 40.2010
2.6 Gearbox 2.7 New deflectors and limit stops
A new, maintenance-free gearbox with a gearhead
angle of 35° is used.
Gearhead angle 35° 1 2
3 4
317TI012 KN
317TI037 KN
The optimum 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 Limit stop 200 mm for circular saw blades
4 Limit stop 225 mm for circular saw blades
All new deflectors and limit stops are fastened with
secured screws. This prevents loss of the screws.
For details about the approved deflectors and limit
stops, see b 4.
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Technical Information 40.2010 Page 9
2.8 4-point anti-vibration system 2.9 New full universal harnesses
317TI017 KN
Four anti-vibration elements for damping vibrations
are installed between the engine and the drive tube,
In addition to rubber buffers and annular buffers as
anti-vibration elements in the area of the engine,
317TI018 KN
steel springs are used as anti-vibration elements in
the area of the handlebars. The 4-point anti-
vibration system ensures a very low vibration level,
optimal control and reduced operating effort. – Functional, modern shape – outstanding
handling and ergonomics
– Very low weight: 0.74 kg
– Available in two sizes, L and XXL
The new universal harness includes an information
sheet about putting on the harness properly and the
ways in which it can be adjusted.
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)m~ge 10 Technical Information 40.2010
3. Specifications 3.2.3 Carburetor
All-position diaphragm carburetor with integral fuel
3.1 Engine pump
No manual carburetor
STIHL single cylinder two-stroke engine adjustment required see b 1.2.6
Service work on carburetor see b 8.9
Displacement: 2.78 cu in (45.6 cm3)
Bore: 1.73 in (44 mm)
Stroke: 1.18 in (30 mm) 3.3 Ignition system
Engine power to ISO 8893: 3.0 bhp (2.2 kW) Ignition module with integrated electronic speed
limiter
Speed at max. output: 9500 rpm
Spark plug (suppressed): NGK CMR6H
Max. torque: 2.7 Nm Electrode gap: 0.020 in (0.5 mm)
Idle speed: 2700 rpm
Clutch engages at: 4200 rpm
3.4 Drive tube
Cut-off speed: 12300 rpm
Drive tube diameter: 28 mm
Drive tube length: 1475 mm
Starter
Drive shaft: Hollow shaft, multi-
Starter rope: 3.0 mm x 1010 mm splined
Pull-out reserve: 1 to 2 turns
3.5 Gearbox
3.2 Fuel system Transmission ratio: 1:1.45
The STIHL one-cylinder, two-stroke engine uses Gearhead angle: 35°
mixture lubrication and requires a mixture of
gasoline and engine oil. Max. output shaft speed 8450 rpm
(tool):
Lubricant: STIHL gear lubricant
3.2.1 Fuel for brushcutters
Mixing fuel: See Instruction Manual Fill quantity: 9.8 g
Top-up quantity: maintenance-free
3.2.2 Fuel tank
Capacity: 25.4 fl oz (0.75 l) 3.6 Weight / dimensions
dry, without cutting attachment 18.7 lbs
and deflector: (8.5 kg)
Total length without cutting
attachment: 1790 mm
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Technical Information 40.2010 Page 11
4. Cutting attachments 4.2 Grass cutting blades, brush knives and
deflector
Observe the permissible combinations of cutting
attachments, deflectors, limit stops and harnesses.
Observe the additional information in the Instruction
Manual 7
10
8
4.1 Mowing heads and deflector
1
6 9
3TI001 KN
2
Designation Part number
3 7 Grass cutting blade 230-4 4000 713 3801
8 Grass cutting blade 255-8 4000 713 3802
4
5903TI003 KN
5 9 Brush knife 300-3 4119 713 4100
10 Deflector for grass cutting
blades and brush knives 4147 710 8104
Designation Part number
1 Mowing head Full harness must be used.
STIHL SuperCutTM 40-2 4003 710 2142
2 Mowing head
STIHL AUTOCUT® 40-2 4003 710 2189
3 Mowing head
STIHL AUTOCUT® 40-4 4005 710 2102
4 Mowing head
STIHL TrimCutTM 41-2 4003 710 2108
5 Mowing head
STIHL PolyCutTM 41-3 4003 710 2114
6 Deflector only for mowing
heads 4147 710 8103
Full harness must be used.
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)m~ge 12 Technical Information 40.2010
4.3 Circular saw blades and limit stop
11 12 13
14 15 16
3TI002 KN
Designation Part number
11 Circular saw blade 200-44,
scratcher tooth 4000 713 4200
12 Circular saw blade 200-22,
chisel tooth 4119 713 4200
13 Limit stop 200 4147 710 8200
14 Circular saw blade 225-48,
scratcher tooth 4000 713 4205
15 Circular saw blade 225-24,
chisel tooth 4110 713 4204
16 Limit stop 225 4147 710 8201
Full harness must be used.
5. Accessories
Designation Part number Use
STIHL gear lubricant for brushcutters Lubrication between rope rotor and starter post
– Tube 80 g 0781 120 1117
– Tube 225 g 0781 120 1118
STIHL special lubricant 0781 417 1315 Coating the rewind spring in the starter
Cover plate kit 4147 007 1001 Under extreme winter conditions
Full harnesses:
– Universal harness L 4147 710 9002
– Universal harness XXL 4147 710 9004
Chest strap 0000 790 7700 for universal harness
Tool backpack 4147 881 5700
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Technical Information 40.2010 Page 13
6. Service accessories
6.1 New special tools
1 2 3
6
7
5
317TI028 KN
Designation Part number Use
1 Setting gauge 0000 890 6400 Setting the air gap between ignition module and
flywheel
2 Press sleeve 4147 893 2400 Press in oil seal
3 Flange 5910 850 4201 Leak testing
4 Puller 5910 890 4408 Removing the drive pinion of the gearbox
5 Sleeve 5910 893 1709 Mounting the hookless snap ring
6 Ring 5910 893 7005 Place on the clutch housing to protect the guide
sleeves
7 Puller 5910 890 4503 Removing the flywheel and the starter-side half of the
crankcase
6.2 Existing special tools
The existing special tools are listed in the Service
Manual for STIHL FS 240 C, FS 260 C, FS 360 C,
FS 410 C, FS 460 C.
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)m~ge 14 Technical Information 40.2010
6.3 Aids
Designation Part number Use
Set of gaskets 4147 007 1600 Engine
Set of carburetor parts 4147 007 1700 Carburetor
Grease (225 g tube) 0781 120 1111 Lubricating oil seals, sliding and bearing
points
Press fluid OH 723 0781 957 9000
STIHL gear lubricant for brushcutters Lubricating the gearbox and lubrication
between the rope rotor and starter post
– Tube 80 g 0781 120 1117
– Tube 225 g 0781 120 1118
STIHL multi-purpose grease Lubricating the drive shaft
– Tube 80 g 0781 120 1109
– Tube 225 g 0781 120 1110
Tube of sealant Dirko HT red 0783 830 2000 Sealing the crankcase
Standard solvent-based degreasant not Cleaning mating surfaces and
containing any chlorinated or carburetor, cleaning the crankshaft stub
halogenated hydrocarbons and the cone in the flywheel
7. Spare parts
The spare parts lists will be available in time for the
market launch and are already contained on the
03/2010 edition of the STIHL Service
Communication System DVD.
8. Servicing
The specific national safety regulations and the
safety instructions in the instruction manual must be
observed if the machine has to be started up during
servicing.
8.1 Troubleshooting plan
The flow charts that follow deal with specific parts
diagnosis and troubleshooting for the M-Tronic
engine management system.
The flow charts help you to take the correct step at
the correct time.
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Technical Information 40.2010 Page 15
8.1.1 Engine does not start
Engine does not start
yes
Move choke lever to position } Is it possible to start the Troubleshooting completed
engine?
Check ignition system
no according to "Flow chart
ignition system troubleshooting“,
see Service Manual
yes
yes
Check ignition Ignition spark Is it possible to start
(spark plug, spark plug boot, ignition present? the engine?
spark)
Mechanically check start detection Mechanically Clean switch gear
(b 8.6.1) OK? replace if necessary
yes
no Replace switch gear if necessary
Electrically check start detection Are target values
(b 8.6.2) attained?
yes
Check solenoid valve (b 8.5) Are target values Replace switch gear and/or
attained? carburetor
yes
Look for a fault in the fuel path,
check engine for leaks
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)m~ge 16 Technical Information 40.2010
8.1.2 Engine does not start in position }
Engine does not start in position } –
engine floods. The flooded engine can
be started in position F
yes
Is it possible to start Troubleshooting completed
the engine?
Mechanically check start detection Clean switch gear
(b 8.6.1) no replace if necessary
Mechanically
OK?
yes
no Replace switch gear if necessary
Electrically check start detection Are target values
(b 8.6.2) attained?
yes
Look for a fault in the fuel path
(inlet needle, lever, spring,
membrane),
check engine for leaks
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Technical Information 40.2010 Page 17
8.1.3 Engine speed drops under load –
low power
Engine speed drops under load – low
power
Check air filter, replace if necessary
Remove cutting attachment, all
mounting hardware and thrust plate.
Let the machine run three to four
times for approx. 30 s in the cut-off
range
yes no
Cut-off speed =
12300 rpm?
Troubleshooting completed Look for a fault in the fuel path,
check engine for leaks
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)m~ge 18 Technical Information 40.2010
8.1.4 Ignition – no ignition spark
No ignition spark
yes
Move choke lever to position } Is it possible to start Troubleshooting completed
the engine?
Check the flywheel Establish correct control
Combination
(two pairs of poles?) unit/flywheel combination
OK?
yes
Check air gap Air gap
(control unit/flywheel) OK? Set correct air gap
yes
Check ignition system
according to "Flow chart
ignition system troubleshooting“,
see Service Manual
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Technical Information 40.2010 Page 19
8.1.5 Engine stops suddenly
Engine stops suddenly
yes
Machine Troubleshooting completed
OK?
Check fuel path no
Service fuel
(fuel pick-up body, tank vent, fuel Fuel path system
hoses) OK?
yes
Tighten screws/bolts and push on
no boot all the way,
Connection
Check screw connection of switch OK? replace switch gear if necessary
gear
yes
Mechanically check start detection Clean switch gear
(b 8.6.1) Mechanically replace if necessary
OK?
yes
Electrically check start detection Replace switch gear if necessary
Are target values attained?
(b 8.6.2)
yes
Check solenoid valve (b 8.5) Are target values Replace switch gear and/or
attained? carburetor
yes
Check engine for leaks
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)m~ge 20 Technical Information 40.2010
8.1.6 Cut-off speed not reached
Cut-off speed lower than
12300 rpm
Check air filter and spark arrestor
screen (present only in some
countries) in muffler,
replace if necessary
Remove cutting attachment, all
mounting hardware and thrust plate. Cut-off speed = yes
Let the machine run three to four times Troubleshooting completed
12300 rpm?
for approx. 30 s in the cut-off range
Tighten screws/bolts and push on
no boot all the
Connection
Check screw connection of switch OK? way, replace switch gear if
gear necessary
yes
Check start detection (b 8.6)
Replace switch gear if necessary
Are target values attained?
yes
Look for a fault in the fuel path,
check engine for leaks
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)qechnic~l=fnform~tion=QMKOMNM======================================================================================m~ge=ON
8.2 Ohmmeter and plug connections 8.3.2 Checking plug connection on solenoid
An ohmmeter (multimeter) with a diode tester is
required for the following test procedures.
To ensure a reliable contact:
– Use appropriate test probes 4
– Do not widen or bend plugs and connector tags
– Unplug and plug in plug connections by hand
whenever possible in the direction of the
connector tags – do not insert them on a slant or
5903TI008 KN
tilt or widen them
– Plug must be seated firmly
. Plug (4) must be seated completely and firmly in
the recess of the solenoid
8.3 Checking screwed and plug connections
A reliable connection must be ensured for
communication between control unit, switching 8.4 Connecting the M-TronicTM test lead to
device and solenoid valve. If communication the diagnostic jack
between control unit and solenoid valve is
. Remove the filter cover
interrupted or faulty, the control unit does not initiate
an ignition spark. Thus if there is no ignition spark,
first check the plug connections and wiring harness
between control device and solenoid.
8.3.1 Checking screwed connections
5903TI009 KN
3 2 2
1 . Remove stopper (1) – diagnostic jack is
accessible
3
5903TI007 KN
. Screws (1) tight
. Leads (2) completely and firmly in the cable
lugs (3)
5903TI010 KN
. Connect M-Tronic test lead 5910 840 0903 to
the diagnostic jack
After disconnecting the test lead, reseal the
diagnostic jack with the stopper.
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)m~ge 22 Technical Information 40.2010
8.5 Checking the solenoid valve 8.6 Checking the start detection system
. Remove the filter cover
8.5.1 Measure resistance
. Remove starter
. Move choke lever to position F
. Remove shroud
. Connect M-Tronic test lead 5910 840 0903 to
the diagnostic jack, see b 8.4
. Measure resistance between the plugs of the 8.6.1 Mechanical check
M-Tronic test lead
Target value: between 28 and 42 ohms
3
If the target value is not attained, check electrical
leads for interruption, short to voltage and short to 2
ground see b 8.7.3. 1
5903TI012 KN
. Set choke lever to position } – the cam (1)
must actuate the pin (2) of the micro switch (3)
8.6.2 Electrical check
1
2
5903TI013 KN
. Disconnect the plug (1) from the solenoid (2)
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Technical Information 40.2010 Page 23
8.7 Checking the wiring harness
3 2
8.7.1 Checking the ground connection
. Move choke lever to position F
1
2
5903TI014 KN
1
. Unscrew bolts (1)
. Remove blue lead (2) and red lead (3)
5903TI015 KN
. Move choke lever to position }
. Connect M-Tronic test lead 5910 840 0903 to
the diagnostic jack, see b 8.4
. Measure the resistance between lug (1) and
screw (2) at the control unit.
Connect M-Tronic test lead to Multimeter: Target value: < 10 ohms
. Insert black plug in "com" / "ground" jack
. Insert red plug in "volt" / "ohm" jack
8.7.2 Checking leads between control unit and
. Set multimeter to "diode test" diagnostic jack
Test diode on micro switch – follow the direction . Move choke lever to position F
in the multimeter Instruction Manual:
. Connect M-Tronic test lead 5910 840 0903 to
If the micro switch (switching device) is intact, the diagnostic jack, see b 8.4
readings will match the following target values:
– Choke lever in position Start } – measurement
in direction of flow
Target value: 0.3 volts to 0.7 volts (direction of
flow)
1
– Choke lever in position F – reverse-biased
measurement
Target value: 1.2 volts to infinity – observe
5903TI016 KN
display, e.g., display [O.L.] or [1.] (reverse bias) 2
If target values are not attained, check wiring
. Measure the resistance between red lead (1)
harness, see b 8.7.
and black plug (2) of the diagnostic cable.
Replace micro switch (switch gear) if necessary.
Target value: < 10 ohms
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)m~ge 24 Technical Information 40.2010
3 5
4 6
5903TI019 KN
5903TI017 KN
. Measure the resistance between black lead (3) . Measure the resistance between black lead (5)
and red plug (4) of the diagnostic cable. at the plug of the solenoid and red plug (6) of the
Target value: < 10 ohms diagnostic cable.
Target value: < 10 ohms
8.7.3 Checking leads between solenoid and
diagnostic jack 8.8 Cable routing
. Move choke lever to F
. Connect M-Tronic test lead 5910 840 0903 to
the diagnostic jack, see b 8.4 8.8.1 Cable routing at the bushing
Leads between diagnostic jack and switch gear
3
1 B 1
A
2
4 2
5903TI013 KN
5903TI020 KN
. Disconnect the plug (1) from the solenoid (2)
. Insert the thin black lead (1) between diagnostic
jack (2) and switch gear (3) in the guides
. Insert the thin red lead (4) between diagnostic
3 jack (2) and switch gear (3) in the guides
Make certain that in area (A) the leads (1, 4) are in
two separate guides and in area (B) the leads are in
the same guide – black lead (1) under the red
lead (4).
5903TI018 KN
. Measure the resistance between red lead (3) at
the plug of the solenoid and black plug (4) of the
diagnostic cable.
Target value: < 10 ohms
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Technical Information 40.2010 Page 25
Leads between diagnostic jack and control unit 8.8.3 Cable routing between switch gear and
solenoid
. Install bushing with switch gear – set choke
3 B lever to position F
A
5
6 2
5903TI021 KN
1 2
5903TI023 KN
. Insert the thick black lead (5) between
diagnostic jack (2) and switch gear (3) in the
guides
. Insert the thick red lead (6) between diagnostic . Insert plug (1) at solenoid as far as it will go
jack (2) and switch gear (3) in the guides . Insert black lead (2) and red lead (3) between
Make certain that in area (A) the leads (5, 6) are in switch gear and solenoid in the guide – black
two separate guides and in area (B) the leads are in lead (2) under the red lead (3)
the same guide – black lead (5) under the red
lead (6).
8.8.4 Cable routing in cable holder
8.8.2 Cable routing at the switch gear
3 6
5
5903TI024 KN
4
1 3 1 2
5903TI022 KN
2
. Fasten cable holder (1) to clutch housing with a
screw (2)
. Insert the black lead (1) from the plug (2) of the
. Insert black lead (3) (switch gear) in the guide –
solenoid in the guide
connector tag and terminal socket on the black
. Insert the black lead (3) from the diagnostic lead are welded and cannot be separated
jack (4) in the guide
. Insert the red lead (5) from the diagnostic
jack (4) in the guide
. Insert the red lead (6) from the plug (2) of the
solenoid in the guide
TI_40_2010_30_01_01.fm
)m~ge 26 Technical Information 40.2010
8.9 Service work on carburetor
7 2
5903TI025 KN
5903TI027 KN
5 1 4 6
1
. Insert black lead (4) (throttle cable) in the guide
– connector tag and terminal socket on the black Position of the special bolt (1) must not be changed,
lead are welded and cannot be separated because otherwise the factory default setting will no
. Fasten cable lugs and cable holder (1) to the longer be correct and this can lead to impaired
clutch housing with screw (5) engine performance.
. Insert blue lead (6) (throttle cable) in the guide – Solenoid valve (2) must not be dismantled.
crimped side of the cable lug facing down
. Insert red lead (7) (switch gear) in the guide –
crimped side of the cable lug facing down 8.10 Setting the flywheel air gap
8 9
10
5903TI028 KN
5903TI026 KN
. Insert red lead (8) (control unit) in the guide – Set the air gap between the arms of the control unit
crimped side of the cable lug facing down and the pair of magnetic poles marked "N"/ "S" on
the flywheel – use setting gauge 0000 890 6400
. Insert blue lead (9) (control unit) in the guide –
(see b 6.1)
crimped side of the cable lug facing down
Air gap: 0.30 mm (+0.05 mm/-0.10 mm)
. Tighten screws (10)
TI_40_2010_30_01_01.fm Page 13 of 28
Technical Information 40.2010 Page 27
8.11 Calibrating the control unit 8.15 Repair times
If the control unit or carburetor is replaced during The specified repair times apply for trained and
servicing, the M-Tronic must be calibrated. qualified personnel as well as for properly equipped
repair shops.
. Remove cutting attachment, all mounting
hardware and thrust plate The repair times are specified in minutes.
. Move choke lever to Start }
. Start engine – do not blip the throttle trigger
. Let the engine run for at least 90 seconds in the
start position and then actuate the stop switch –
calibration is completed
The control unit is adjusted to the carburetor while
the engine runs in the position Start }. The engine
must be switched off immediately for the information
to be stored in the control unit.
8.12 Tightening torques
The tightening torques are listed in the Service
Manual for STIHL FS 240 C, FS 260 C, FS 360 C,
FS 410 C, FS 460 C.
8.13 Service notes
Service and repair procedures are included in the
Service Manual STIHL FS 240 C, FS 260 C,
FS 360 C, FS 410 C, FS 460 C.
8.14 Serial number
317TI029 KN
The serial number is on the bottom of the machine.
TI_40_2010_30_01_01.fm
)m~ge 28 Technical Information 40.2010
Code Type of Repair FS 460 C
1 Replace short block.
2 Replace crankcase, crankcase
gasket or re-seal crankcase.
Includes air leak test. 100
3 Replace crankshaft main
bearing(s). Includes air leak test. 100
4 Replace crankshaft seal(s).
Includes air leak test. 60
5 Perform engine air leak test. 40
6 Replace cylinder and/or piston.
Includes air leak test and repair of
components causing failure. 55
7 Replace ignition module or
flywheel. Includes stop circuit test. 25
8 Replace fuel tank line, tank vent, or
fuel pick-up body. 20
9 Replace intake manifold or intake
flange. 20
10 Repair or replace carburetor.
Includes fuel system testing. 30
11 Repair throttle control. 20
12 Repair or replace rewind starter. 15
13 Repair or replace clutch, clutch
shoes or clutch springs. 30
14 Replace muffler. 15
15 Replace air filter or filter housing. 15
16 Repair or replace stop switch.
Includes circuit testing. 25
17 Replace clutch housing. 20
18 Replace drive shaft and/or drive
tube. 25
19 Replace bearing liner in drive tube. 20
20 Replace limit stop or deflector. 15
21 Replace gears and/or bearings in
gearbox. 35
22 Replace fuel tank. 20
26 Replace solenoid valve or M-Tronic
wiring. Includes diagnostic and
function test. 40
40 Miscellaneous repairs and other
repairs not listed. 15
45 Handling allowance only-no labor. 10
50 No labor. 0
© ANDREAS STIHL AG & Co. KG, 2010 Technical Documentation
D1/MTK-fr
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.