Walker MDD (20.9 HP) - Manual (Page 68)

Maintenance Instructions
CHECKING/SERVICING
64
Fuel Lines and Clamps
Every year, inspect the fuel supply line from the tank
to engine for deterioration or damage. Also, inspect
the fuel line clamps for tightness. Good preventive
maintenance calls for complete replacement of fuel
lines and clamps every two (2) years.
NOTE: This procedure is of special importance for
the diesel engine due to poor performance when air
is injected with the fuel.
Radiator Hoses and Clamps
Inspect the radiator hoses every 200 hours for de-
terioration or damage. Also check the tightness of
the hose clamps. Good preventive maintenance
calls for complete replacement of the radiator hoses
and clamps every two (2) years.
Engine Valve Clearance
Check and adjust the Kubota engine valve clear-
ance every 800 hours. Refer to the Kubota Engine
Owner’s Manual and Workshop Manual for specifi-
cations and procedure to check the valve clearance.
For engine servicing, contact an authorized Kubota
engine dealer or a trained engine technician.
IMPORTANT: Always use the proper engine ser-
vice manual when working on the engine. Improper
engine maintenance or adjustments will adversely
affect engine operation, performance, and durability
and may VOID the warranty.
Fuel Injection Nozzle Pressure
Check and adjust the Kubota diesel engine fuel in-
jection nozzle pressure yearly or every 1000 hours
(or in case of low power). Refer to the Kubota Work-
shop Manual for specifications and procedures to
check nozzle pressure. For engine servicing, con-
tact an authorized Kubota engine dealer or a trained
engine technician.
IMPORTANT: Always use the proper engine ser-
vice manual when working on the engine. Improper
engine maintenance or adjustments will adversely
affect engine operation, performance, durability, and
may VOID the warranty.
Fuel Valve Solenoid
The starting and stopping of the diesel engine is
controlled 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 fuel valve.
Raise the mower body and locate the fuel valve on
the engine. The valve is operated by an electric so-
lenoid 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)
WARNING
The fuel oil injection system operates un-
der high pressure and can penetrate the
skin and result in serious injury. Unqual-
ified persons should not remove or at-
tempt to adjust a pump injector, nozzle, or
any part of the fuel injection system.
Fuel Valve
Solenoid
Fuel Control Arm in Closed Position
Fuel Shut-Off
Valve