Jonsered CS2186 Workshop Manual page 25

Hand grip heater and carburettor heater
CS2186
Some chainsaws are fitted with hand grip heaters and
carburettor heaters, and consist of the following parts:
• Generator.
• Switch.
• Heating element in rear hand grip.
• Front hand grip with heating element.
• Carburettor heating element.
• Thermostat.
Trouble shooting
Trouble shooting can be carried out with most components
fitted on the saw. Trouble shooting requires:
-ammeter
-ohmmeter
-cooling spray.
The most common fault is oxidisation of the heating element
contacts in the rear hand grip and the switch contact.
Carry out trouble shooting as follows:
Heating element in rear hand grip.
Separate the cable connection at B. See fig. 10.
Remove the switch with a screwdriver. See fig. 9.
Set the switch to position "0".
Clean the contacts D, E, F and G. See fig. 10.
Measure the resistance between point B and F, between D and
C and between E and C. See fig. 10
The resistance for both heating elements should be 0.6-2.4 ohms.
Between D and C and between E and C the resistance should
be 0.3-1.2 ohms. Replace the element if the values deviate.
Front hand grip with heating element
Measure the resistance in the front hand grip element between
points A and B. See fig. 10. The ohmmeter should show 3-4 ohms.
If the value is higher, replace the hand grip.
Generator
Measure the resistance in the generator between the points G
and H. See fig. 10.
The ohmmeter should show 0.3-1.3 ohms.
If the value is higher, replace the generator.
Switch
Release one of the connections to the switch and connect the
ohmmeter between the points F and G. See fig. 10.
The ohmmeter should show more than 1000 ohms with the
switch in position "0".
The ohmmeter should show at least 0.1 ohms with the switch in
position "1". Replace the switch if the values deviate.
Carburettor heating element
Measure the resistance for the heating element on the
carburettor at L and J. The ohmmeter should show 3-10 ohms.
Replace the heating element if the value deviates.
Thermostat
Release the earth cable J. Measure with the ammeter between
J and K. Start the saw and run at approx. 10,000 rpm.
The ammeter should show 0 at an air temperature of 15 C or
higher. Cool the thermostat with a cooling spray or the like. The
ammeter should show 2 A at 10,000 rpm.
Replace the thermostat if the values deviate.
Refit the relevant components.
ELECTRICAL SYSTEM
Fig. 9
A
B
F
G
Fig. 10
C
D
E
H
L
J
K
English – 23