Exmark Commercial 21 4500-686 Rev. B - Manual (Page 22)

Maintenance
Maintenance
Note: Determine the left and right sides of the machine from the normal operating position.
WARNING
If you leave the wire on the spark plug, someone
could accidentally start the engine. Accidental
starting of the engine could seriously injure you
or other bystanders.
Disconnect the wire from the spark plug before
you do any maintenance. Set the wire aside so
that it does not accidentally contact the spark
plug.
WARNING
The engine can become very hot. Touching a hot
engine can cause severe burns.
Allow the engine to cool completely before
service or making repairs around the engine area.
WARNING
Tipping the lawn mower may cause the fuel
to leak from the carburetor or the fuel tank.
Gasoline is extremely flammable, highly
explosive, and under certain conditions, can
cause personal injury or property damage.
Avoid fuel spills by running the engine dry or by
removing the gasoline with a hand pump; never
siphon.
Recommended Maintenance Schedule(s)
Maintenance Service
Interval
Maintenance Procedure
After the first 5 hours • Change the engine oil.
Before each use or daily
• Check the engine oil level.
• Check the stopping time of the blade brake. The blade must stop within 3 seconds of
releasing the bail; if it does not, contact an Authorized Service Dealer for repair.
• Check the mower blade and the engine mounting fasteners.
• Check for loose hardware.
• Check the Blade Brake Clutch Bail operation (Blade Brake Clutch Units Only)
• Clean the grass build-up from under the deck.
• Clean the discharge tunnel and plug.
Every 25 hours
• Clean the foam pre-cleaner (Kawasaki Units).
• Clean the cover, base, foam and paper elements (ECSHN21 Units).
• Clean the cover, base, foam and paper elements (ECXHNBBC21 and ECXHN21 Units).
Every 40 hours • Check the condition of the belt(s).
Every 50 hours
• Change the engine oil. (May need more often under severe conditions.)
• Check for leaks in the fuel systems and /or deteriorating fuel hose.
• Clean under the belt cover (self-propelled units only).
• Clean the blade brake clutch shield.
• Clean under the cover plate (Non-BBC Units).
Every 100 hours
• Change the oil filter (ECXKA21 and ECXKABBC21 Units).
• Check the spark plugs.
• Clean the fuel filter element.
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