Husqvarna WGP3616 Operator's Manual page 48

Action
At Least Once Each Year
Clean the engine's cooling air intake (25 hours).
Replace the air cleaner's prefilter (foam) (300 hours).
Replace the air filter paper cartridge (200 hours).
Change the engine oil (100 hours).
Replace the engine oil filter (200 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 (300 hours).
Perform the 300-Hour service at an authorized service workshop.
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