Yanmar EF-494T - Fuel shut off solenoid

10 ELECTRIC EQUIPMENT 10 ELECTRIC EQUIPMENT
EF494T TM 06/2011 edition
208
(3) 3W
(1) 3B
(2) 3R
4. Fuel shut off solenoid
Stop solenoid (119653-77950)
Measurements on an individual component basis (A-end coupler)
Check of the coupler on the main body side (B-end coupler)
The fuel system consists of two circuits: one is the fuel
feed pump circuit that supplies the fuel to the fuel
injection pump through the filter and the other is the fuel
shut-off solenoid circuit that activates the stop lever of
the governor.
The fuel shut-off solenoid allows the operator to start or
stop the diesel engine using the starter switch only. This
is a dual-coil type solenoid having a fail-safe feature; if a
failure occurs in the electric system, the return spring in
the solenoid will cause the engine to stop.
Range
Measuring point
Status
Result
Tester probe
+
Tester probe

Ω
(2)
(1)
Approx.12.4
Ω
Ω
(3)
(1)
Approx.0.33
Ω
Range
Measuring point
Status
Result
Tester
probe
+
Tester
probe

Continuity
(4)
Chassis
grounding
Starter
switch
“OFF”
Yes
DCV
(5)
Chassis
grounding
Starter
switch “ST”
Approx. 12
V
DCV
(6)
Chassis
grounding
Starter
switch “ON”
Approx. 12
V
Fuel shut off solenoid
B
A
(6) 0.5BR
(4) 3WG
(5) 3BR
B-end coupler