The manual doesn't list a specific 500-hour service interval. You are between the 400 and 600 hr maintenances.
Every 400 Hours
• Change transmission oil and filter.
• Clean transmission suction screen.
• Replace fuel filter.
Every 600 Hours
• Check engine low idle speed.
• Check air filter intake hoses and clamps.
• Change front axle oil.
• Check brake adjustment.
Yearly
• Change engine oil and filter if less than 200 hours of operation.
• Drain water from fuel tank and replace fuel filter.
• Check all hoses and clamps.
• Check battery electrolyte level
Every Two Years or 2000 Hours
• Flush and replace factory coolant. Flush cooling system and replace coolant with John Deere COOL-GARD engine coolant.
• Service fuel injection nozzles.