Husqvarna 966 553901-04 Operator's Manual page 42

SERVICE JOURNAL
AT LEAST ONCE EACH YEAR
Action
Clean the engine's cooling air intake
Replace the air cleaner's foam pre-filter
Replace the air filter's paper cartridge
Change the engine oil
Replace the engine oil filter
Check/adjust the cutting height
Check/adjust the park brake
Clean/Change the spark plugs
Inspect spark plug
Check the engine valve clearance
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