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Maintenance Instructions CLEANING
64
Engine Cooling System - MT20 and MTEFI
Air Intake System
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 nec-
essary to check and clean the screen several times
each day to prevent engine overheating.
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.
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 op-
erating the engine.
Engine Air Intake Screen
and Cooling Fin Access Panels
Cooling System Airflow
Engine Cooling System - MTL
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. Remove the screen. To clean the screen, wash
with soapy water or blow out with compressed
air.
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.
DANGER
Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.
Kohler Engine
Shroud
Engine Cooling
Fin Access Panels
Engine Air
Intake Screen
Check Airflow
with Hand
Cylinder
Head