Husqvarna RZ3016 Operator's Manual page 54

Action
300-Hour Service
Perform the 25-hour service
Perform the 50-hour service
Perform the 100-hour service
Check/adjust the mower deck
Clean the combustion chamber and grind the valve seats
Check the engine valve clearance
Replace the air cleaner's pre-filter (foam)
Action
At Least Once Each Year
Clean the engine's cooling air intake (25 hours)
Replace the air cleaner's pre-filter (foam) (300 hours)
Replace the air filter's paper cartridge
Change the engine oil (50 hours)
Replace the engine oil filter (100 hours)
Check/adjust the cutting height
Check/adjust the parking brake (50 hours)
Clean/Change the spark plugs (100 hours)
Change the fuel filter (100 hours)
Check the engine valve clearance
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