Walker MBSSD (27 HP) - Manual (Page 47)

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Maintenance Instructions
CLEANING
10. Install the cover with the word “DOWN” properly
oriented to the bottom of the canister. Twist the
OptiAir™ cover to the right and put into the
"closed" position.
Proper Orientation of Air Cleaner Cover
11. Check the air intake hose for cuts, nicks, cracks,
etc., and the hose clamps for tightness.
12. Reset the air restriction indicator (press button
on the end of indicator).
Engine Cooling System
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.
Keep Engine Screen Clean
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 on the next page.
Cooling System Airflow
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.
3
DOWN DOWN
2
Mono Latch
Twist Lock™
Dust Ejection
Valve
Orient to Bottom
of Canister
DANGER
Make sure to keep hands clear of exhaust
pipe, muffler, and moving parts when
checking airflow.
Rotating Engine Screen
Check Airflow
with Hand