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Stihl MS 240 Manual

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104 MS 240, MS 260, MS 260 C
15.3 Handle Heating System
15.3.1 Troubleshooting
The entire handle heating system is
maintenance-free and subject to
practically no wear. Faults in the
generator, heating elements and
wiring are generally caused by
mechanical damage.
There are two reasons for failures in
the heating system:
1. A break in the circuit
due to a faulty wire or
component.
2. A short circuit resulting from
damage to the insulation.
– Remove the handle molding,
b 12.2
: Push back the insulating tube (1)
of the thin wire in the direction of
the wiring harness.
: Separate the pin and socket
connector.
165RA417 TG
1
165RA418 TG
: Set the heater switch (1) to "F".
– Set the ohmmeter to "Ω".
– Set the switch shaft to "
0".
: Clip test leads to the wire from
the wiring harness and the rear
handle heating element wire.
Versions with carburetor heating
– Separate the pin and socket
connector to the heating element,
b 15.1
All electrical components of the
handle heating system are
connected in series with the
ohmmeter.
If the system is in order, the
ohmmeter will indicate a value of
about 10 Ω in measuring range "Ω".
If no reading is obtained, there is a
break in the circuit.
165RA490 TG
1
165RA420 TG
If the ohmmeter shows a very low
value, there is a short circuit in one
of the components.
In either case it is necessary to
check each component separately,
. The generator wire remains
disconnected from the heating
element during this check.
– Use handle heating and
generator troubleshooting chart
to check the system, b 15.7.1
– Check resistance on handlebar,
b 15.6
– Check resistance on rear handle,
b 15.5
– After completing the test,
reconnect the wires and push the
insulating tube over the pin and
socket connector.
– Reassemble in the reverse
sequence.
15.4 Removing and Installing
the Heater Switch
– Remove the carburetor, b 14.2
– Unscrew the handlebar and turn
it to one side, b 11.5
: Remove the ground wire (1).
165RA421 TG
1
… 105 …


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