Stihl MS 440 - Troubleshooting Chart

83MS 440, MS 440 C
14.1.1 Troubleshooting Chart
Check generator
Resistance between engine ground
and black generator
connection = approx. 0.9 Ω ?
Start
Do both handles
warm up?
Measure resistance of
individual heating elements
with ohmmeter
(On machines with carburetor heating,
pull connector pins of wire from heating
element on carburetor out of round plugs)
no
yes
Turn on
switch
yes
Resistance of rear handle heating element
about 1 Ω ?
Check handle heating element
In good condition?
Adhesion OK?
Heater switch
on "#"?
no
no
no
Replace
handle heating
element
Install new
generator
yes
yes
yes
no
2
1
3