Husqvarna RZ4621 BF Operator's Manual page 57

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.
SERVICE JoURNAl
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