Checking The Solenoid Valve - Stihl MS 661 Manual

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1
Screws (1) must be tightened down
firmly.
Wires (arrows) must be properly
and firmly seated in the cable lugs.
1
3
: Check terminal sockets (1, 2)
and contact sleeve (3) for contact
– the wires must be properly and
firmly seated in the terminal
sockets and the contact sleeve.
1
Connector (1) must be properly
seated in solenoid valve.
MS 661, MS 661 C-M
Make sure that no dirt gets between
the connector and solenoid valve. If
necessary, clean area before
removing the connector.
: Pull off the connector (1) and
check the contacts.
When the connector is installed,
check that the wires are properly
seated in the switch unit's guides
and the loop (arrow) is next to the
connector.
2
2
2
1
: Move throttle lever in direction of
full throttle and set Master
Control lever (1) to }, the
lever (2) on the choke shaft must
operate the microswitch (arrow)
– with an audible click.
– If the microswitch is not operated
by the lever (2) on the choke
shaft, fit a new lever if necessary,
b 13.5.7
– If the microswitch does not work
when it is operated, install a new
switch unit, b 8.5
8.3.4 Checking the Solenoid
Valve
– Carry out preparations, b 8.3.1
– Test screw and plug connections,
b 8.3.3
– Check contact and operation,
b 8.3.5
Master Control lever must be on
"F".
– Connect test cable, b 8.3.2
Measuring resistance
2
: Measure resistance between the
plugs (1) and (2) of the M-Tronic
test cable.
Specified value: between 28 and
42 Ω.
– If this value is not obtained, check
wires for break, e.g. between
solenoid valve and diagnostic
socket, or check for lack of
contact due to damaged
insulation, replace solenoid valve
if necessary, b 8.6
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