Walker MB (18 HP) - Manual (Page 43)

Maintenance Instructions
CLEANING
41
CLEANING
Engine Air Cooling System
To prevent engine overheating and possible engine
damage, clean grass clippings, chaff and dirt from
the rotating engine air intake screen every 8 hours of
operation. In certain mowing conditions (dry grass,
leaves, tree "cotton", etc.) it may be necessary to
check and clean this area several times each day to
prevent engine overheating. Also, visually check
inside cylinder head shroud and between cylinder
head fins for material packed in this area which
would prevent cooling airflow; remove shroud and
clean as required.
IMPORTANT: Yearly or every 100 hours, remove
engine cooling shroud and clean cylinder head cool-
ing fins to prevent overheating. Make sure cooling
shroud is reinstalled properly.
Keep Engine Screen Clean
Clean Cooling Fins and Fan
Air Cleaner System
The engine is equipped with a paper air cleaner ele-
ment with an oiled foam pre-cleaner which
surrounds the paper element. Clean and re-oil the
foam pre-cleaner every 25 hours; more often in
dusty/dirty conditions. Clean the paper element
every 100 hours and replace yearly (or when dirty or
damaged). Service the air filter as follows:
•
Remove air cleaner cover and remove foam pre-
cleaner by sliding it off the paper element.
•
Wash foam pre-cleaner in liquid detergent and
warm water.
•
Wrap foam pre-cleaner in cloth and squeeze dry
(do not wring).
•
Saturate foam in clean engine oil. Squeeze
foam to distribute and remove excess oil.
•
Remove the paper filter element by pulling it out
of the air cleaner body.
•
Clean the filter element using low pressure com-
pressed air [less than 100 PSI (689 kPa)]. Blow out
the filter from the interior of the element while turning
the element.
NOTE: Washing the element in water or cleaning
solution is not recommended. Replace the element
if it does not clean up with compressed air.
CAUTION
Operating the engine with a blocked air in-
take screen, dirty or plugged cooling fins,
and/or cooling shrouds removed will
cause engine damage from overheating.
Rotating Engine Screen
Clean these areas
of dirt and debris