Handle Heating System; Troubleshooting - Stihl MS 341 Shop Manual

14.

Handle Heating System

14.1

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.
2
Tracing the cause of a fault
– Remove the interlock lever –
b 10.2.1 or 10.2.2
: Ease the wire (1) out of the guide
(arrow).
: Push back the insulating
tubes (2).
– Separate the wire with the larger
cross section.
MS 341, MS 361, MS 361 C
: Move the heater switch (1) to " # ".
– Set ohmmeter to "W".
1
: Connect the ohmmeter test leads
to the two wires.
All electrical components of the
heating system are connected in
series with the ohmmeter.
Carry out the measurement at an
ambient temperature of + 25 °C
(77 °F).
If the system is in order, the
ohmmeter will show a reading of
about 5 W in measuring range "W".
If no reading is obtained or an
infinitely high value is shown, there
is a break in the circuit.
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 –
b 14.2 and 14.4.
The generator wire remains
disconnected from the heating
1
element during this check.
91