Walker MDD (20.9 HP) - Manual (Page 62)

Maintenance Instructions
CLEANING
58
10. Check the air intake hose for cuts, nicks, etc.,
and the hose clamps for tightness.
11. Reset the air restriction indicator (press button
on bottom).
Engine Cooling System
Radiator Screen and Cooling Fins
To prevent the engine from overheating and possi-
ble engine damage, clean grass clippings, chaff,
and dirt from the fine mesh radiator intake screen
daily. In certain mowing conditions (dry grass,
leaves, tree “cotton”, etc.), it may be necessary to
check and clean the screen several times during use
to prevent engine overheating.
1. Lift to remove the screen. To clean the screen,
wash with soapy water or blow out with com-
pressed air.
2. Inspect the radiator cooling fins for material
lodged in this area which would restrict cooling
airflow. Use pressurized air or water to clean.
DO NOT use any tool, like a screwdriver or
knife, to clean material out of the fins as this
may damage the cooling fins. DO NOT use cold
water on a hot radiator.
NOTE: Directing pressurized air or water from
the fan side of the radiator outward is recom-
mended to dislodge material packed on the out-
side of the cooling fins. DO NOT use cold water
on a hot radiator.
Flushing Radiator and Changing Coolant
Change engine coolant every year. Drain the cool-
ant from the engine and radiator:
1. Remove the radiator cap.
2. Open the drain cocks on the engine block and
radiator (see the Kubota Owner's Manual for lo-
cation of the drain cocks). Also, drain the cool-
ant recovery tank.
3. If there is any indication of deposits or scaling
inside the radiator, use a commercial scale re-
mover and flush the cooling system thor-
oughly before adding fresh coolant.
Use a pre-mixed 50/50 solution of antifreeze (ethyl-
ene glycol) and distilled water to refill the cooling
system.
IMPORTANT: The solution of antifreeze and water
must be thoroughly pre-mixed before putting it in the
engine. Adding pure antifreeze into the radiator may
cause damage to the engine from overheating.
IMPORTANT: Maintain proper coolant level in the
radiator and coolant recovery tank. The coolant lev-
el should be maintained between FULL and LOW
marks on the coolant recovery tank. Recheck the
coolant level after the first time the engine has been
operated after filling the coolant system (it would be
normal to add a little coolant after initial operation).
Grass Buildup in Mower Housing
1. Raise the deck lock lever handle on each side
of the carrier frame and pull out to release car-
rier frame for tilting action.
2. Using the carrier frame lift handle, raise deck to
the TILT-UP position and insert the deck hook
into the tilt-up latch on the tractor body.
WARNING
Radiator and engine parts can become ex-
tremely hot during operation. Wear gloves
and avoid touching hot parts while clean-
ing the radiator screen and cleaning de-
bris away from the engine and cooling
system.
DANGER
Before raising or removing the mower
deck for cleaning, stop the engine, re-
move the ignition key, and disconnect the
electrical plug on the fuel shut-off sole-
noid.