The last statement in the servicing engine section states to change the oil and filter yearly if less than 200 hours a year use. So, my take on it is by time -- 200 hours or more -- or by the calendar -- every year unless used more than 200 hours a year.
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Service Intervals
Servicing Your Machine
IMPORTANT: Avoid damage! Operating in extreme conditions may require more frequent service intervals:
· Engine components may become dirty or plugged when operating in extreme heat, dust or other severe conditions.
· Engine oil may lose efficiency if vehicle is operated constantly at slow or low engine speeds or with frequent short trips.
Please use the following timetables to perform routine maintenance on your machine.
As Needed
· Replace alternator belt.
· Replace air filter elements.
· Replace light bulbs.
· Replace fuses.
· Clean and replace battery.
· Replace radiator hoses and clamps.
· Check tire air pressure.
· Clean fuel tank overfill reservoir.
· Drain water and sediment from fuel tank, and service water separator.
· Check and clean front grille screens.
· Check and clean radiator cooling screen.
· Clean debris from engine compartment.
After First 10 Hours
· Check wheel bolt torque.
Every 10 Hours or Daily
· Test safety systems.
· Check engine oil level.
· Check transmission oil level.
· Check air filter rubber dust unloading valve.
· Check radiator coolant level.
After First 50 Hours
· Change engine oil and filter.
· Change transmission oil and filter.
· Clean transmission suction screen.
Every 50 Hours
· Check front axle oil level.
· Lubricate machine.
Every 200 Hours
· Change engine oil and filter.
· Inspect alternator belt.
· Check wheel bolt torque.
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 1200 Hours
· Check engine valve clearance. See your John Deere dealer.
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.
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L8R
J