14.7.1 Handle Heating And Generator Troubleshooting Chart - Stihl MS 661 Manual

14.7.1 Handle Heating and Generator Troubleshooting Chart

yes
Measure resistance of individual
heating elements with ohmmeter
Separate the screw connection to the
Check rear handle heating element.
Flat against handle housing?
of rear handle heating element
Resistance between engine ground
and generator connection
1
126
Start
Do both handles
warm up?
no
Heater switch
on "F"?
yes
thermostatic switch
b 13.4
In good condition?
yes
Resistance
about 1.6 Ω?
yes
Check generator
about 0.5 – 1 Ω?
yes
2
Set switch
no
to on
no
Install new rear handle
heating element
b 14.5
no
no
Replace
generator
b 14.7
3
MS 661, MS 661 C-M