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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Engine Cooling System - Model MW
Air Intake Screen
Before each use, check that the air intake (rotary)
screen is free from grass and debris and clean if nec-
essary.
Engine Cooling Fins
Every 100 hours, check and clean the cooling fins and
inside of engine shrouds to remove grass, chaff or dirt
clogging the cooling system and causing overheating.
When cleaning, remove the recoil starter and the fan
housing.
Engine Air Cooling System - Model MB
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 oper-
ation. 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 en-
gine overheating. Also, visually check inside cylinder
head shroud and between cylinder head fins for mate-
rial packed in this area which would prevent cooling air-
flow; remove shroud and clean as required.
IMPORTANT: Yearly or every 100 hours, remove en-
gine cooling shroud and clean cylinder head cooling
fins to prevent overheating. Make sure cooling shroud
is reinstalled properly.
Keep Engine Screen Clean
Clean Cooling Fins and Fan
Air Cleaner System - Model MB
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 condi-
tions. Inspect the paper element every 100 hours and
replace yearly (or when dirty or damaged). Service the
foam precleaner 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.
• Use a clean, damp cloth and wipe the interior of the
air cleaner body clean. Use special care to clean both
the inside and outside surfaces of the outlet tube.
• Install foam pre-cleaner over dry element and reas-
semble onto engine. Tighten knob mounting air cleaner
element securely, 1/2 to 1 turn after contacting cover,
but do not over-tighten. Make sure element is sealed
tightly against the element cover and base plate. Rein-
stall air cleaner cover.
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
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