Husqvarna RZ4221 BF Operator's Manual page 51

Action
After the First 10 Hours
Change engine oil.
25-Hour Service
Check the fuel pump's air filter.
Check the hydraulic system's oil level.
Check the tire pressures.
Lubricate the belt adjuster, mower deck.
Lubricate the belt adjuster, hydraulic pumps.
Check/clean the engine's cooling air intake.
Clean air filter dust cap.
SERVICE.JOURNAL
Date, mtr reading, stamp, sign
51