Husqvarna MZ5424SR CA Operator's Manual page 63

Action
At least once each year
Clean the engine's cooling air intake.
Replace the air cleaner's pre-filter (foam).
Replace the air filter's paper cartridge.
Change the engine oil.
Replace the engine oil filter
Check/adjust the cutting height
Check/adjust the parking brake
Clean/change the spark plugs
Check the engine valve clearance
SERVICE JOURNAL
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