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John Deere 6120 Maintenance Data

John Deere 6120 Maintenance Intervals

Every 10 Hours or Daily

Check engine oil level.
Check engine air filters.
Check the coolant level.

Every 50 Hours

Check battery condition.
Check hydraulic/transmission fluid level.
Check front axle oil level.
Lubricate front axle hub bearings.
Inspect wheels and tires.

Every 250 Hours

Clean cab fresh air filter.
Clean cab recirculation air filter.
Clean primary engine air filter.
Remove dirt from radiator fins.
Inspect fan/alternator belt tension.

Every 500 Hours

Change engine oil. Engine oil - Plus-50, SAE 15W-40, 10W-30, 5W-30.
Replace engine oil filter.
Replace fuel filter element.
Replace primary fuel filter.
Replace final fuel filter.
Replace cab activated carbon air filter.
Check and adjust engine idling.
Check brake adjustment.

Every 750 Hours

Replace transmission oil filter.
Replace hydraulic oil filter.
Replace hydraulic filter element.
Replace front PTO oil filter.
Check the radiator coolant.
Lubricate rear axle bearings.
Check and adjust valve clearance.

Every 1500 Hours

Replace primary engine air filter.
Replace secondary engine air filter.
Replace cab fresh air filter.
Replace cab recirculation air filter.
Change hydraulic/transmission fluid. Fluid type - Hy-Gard, JDM J20C, JDM J20D.
Change front axle oil. Front axle oil - Hy-Gard.
Flush cooling system and add new coolant.

Refill Capacities

Cooling system capacity ................. 13.5 L (3.6 gal).
Engine oil capacity ................. 16 L (4.2 gal).
Transmission/hydraulic capacity (SyncroPlus) ................. 52 L (13.7 gal).
Transmission/hydraulic capacity (16F/16R PowrQuad Plus) ................. 49 L (12.9 gal).
Transmission/hydraulic capacity (24F/24R PowrQuad Plus) ................. 50 L (13.2 gal).
Front axle housing capacity ................. 6.5 L (1.7 gal).
Front PTO oil capacity ................. 3.5 L (0.9 gal).

John Deere 6120 Replacement Parts

Engine primary air filter. Part number ................. AL172780.
Engine secondary air filter element. Part number ................. AL150288.
Engine oil filter. Part number ................. RE504836.
Fuel filter element. Part number ................. RE62419.
Primary fuel filter. Part number ................. RE509208.
Final fuel filter. Part number ................. RE509031.
Hydraulic oil filter. Part number ................. AL118036.
Hydraulic filter element. Part number ................. AL203060 or AL203061.
Transmission oil filter. Part number ................. AL156625.
Front PTO oil filter. Part number ................. L114404.
Cab fresh air filter. Part number ................. AL177184 (Std) or AL177185 (HD).
Cab recirculation air filter. Part number ................. L155288.
Cab activated carbon air filter. Part number ................. AL158986.

Annual Maintenance

Change engine oil and replace oil filter.
Replace air cleaner elements.
Change transmission/hydraulic fluid.
Install a new transmission/hydraulic filter.
Drain water from fuel tank and replace fuel filter.
Clean radiator and oil cooler fins.
Flush the cooling system and refill with new coolant.
Inspect all clamps and hoses.
Check battery electrolyte level.
Adjust engine valve clearance.
Inspect and adjust fuel injectors.