1998 S/N 21329 - Walker Mowers

Maintenance Instructions
CLEANING
Paper Element Gasket -
Lightly Grease to
Improve Sealing Action
DANGER
Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.
Rubber
Seal
Engine Cooling System
Air Intake System
Air Cleaner Base Plate
(Check Sealing Surface)
Air Filter Reinstallation
To prevent engine overheating and possible engine
damage, clean grass clippings, chaff, and dirt from
the rotating engine air intake screen after every 8
hours of operation. In certain mowing conditions
(dry grass, leaves, tree “cotton”, etc.), it may be necessary
to check and clean the screen several times
each day to prevent engine overheating.
Every 100 hours, inspect and clean the cooling fins
(more often when operating in extremely dusty, dirty
conditions). Remove the two (2) cooling fin access
panels in the engine shroud and clean the cooling
fins and external surfaces using compressed air.
Make sure to reinstall the access panels before operating
the engine.
NOTE: Some Kohler engines have not been
equipped with the cooling fin access panels. Kohler
kit #25-755-21 installs the panels if they are missing.
Engine Cooling
Fin Access Panels
Kohler Engine
Shroud
Engine Air
Intake Screen
Engine Air Intake Screen
and Cooling Fin Access Panels
CAUTION
Operating the engine with a blocked air
intake screen, dirty or plugged cooling
fins, and/or cooling shrouds removed will
cause engine damage from overheating.
Cylinder
Head
Cylinder Head Cooling Fins
It is essential for performance and longevity of the
air-cooled engine to keep the cylinder head cooling
fins clean and free of obstruction. After every 8
hours of operation, check the performance of the
cooling system by starting the engine, holding a
hand adjacent to the cylinder head, and feeling the
cooling airflow. If there is little or no airflow, clean the
cooling fins as described below.
Cooling System Airflow
Check Airflow
with Hand
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