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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Fuel Valve Solenoid - Model MD
The starting and stopping of the diesel engine is con-
trolled by the fuel shut-off valve. If the engine cranks,
but does not start or the engine does not stop when the
ignition switch is turned OFF, check operation of the fu-
el valve.
Raise the mower body and locate the fuel valve on the
engine. The valve is operated by an electric solenoid
which is controlled by the ignition switch. The valve
is open when the ignition key is moved to the START or
RUN position, and the valve is closed when the ignition
key is moved to the OFF position.
Fuel Valve Closed (Engine OFF Position)
Fuel Valve Open
(Engine START and RUN Position)
If the fuel valve solenoid is not operating properly, the
problem may be isolated by first checking the opera-
tion of the solenoid as follows:
1. Disconnect the fuel valve solenoid wire plug from
the wire harness.
2. Make jumper wire connections from the solenoid to
the battery:
a. Red wire to positive terminal (+), black wire to
ground (-).
b. Touch white wire to the positive terminal (+)
and the solenoid should pull closed (open the
fuel valve).
c. Remove the white wire and the solenoid
should hold the fuel valve open.
d. Remove the red wire and the solenoid should
open (close the fuel valve).
Replace the solenoid if it does not operate properly by
the above test. If it does operate, the problem is in the
electrical system and can be checked using the wiring
diagram. Refer to SCHEMATICS for the Wiring Dia-
gram in the Electrical Systems Section.
Fuel Valve
Solenoid
Fuel Control Arm in Closed Position
Fuel Shut-Off
Valve
Fuel Control Arm In
Open (Run) Position
Fuel Shut-Off
Valve
Throttle Control Arm (Noted For Reference)
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