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John Deere 4120 Maintenance Information

John Deere 4120 Periodic Maintenance

Every Ten Hours or Daily Checking

Check motor oil level. If after checking the engine oil level is low, top it up.

Check transmission/hydraulic oil level. When transmission/hydraulic oil is low, fill in new oil.

Check engine primary/secondary air filter elements. Change if required.

Check coolant level in radiator. If the coolant level is too low, add coolant in cooling system.

Check engine idling, steering system, hand brake and service brakes. Repair any damage if necessary.

Oil And Filter Change

Every 200 Hours

Engine oil change. Recommended motor oil: Plus-50, SAE 15W-40, 10W-40, 10W-30, 5W-30. API Service Category CH or higher. Oil system capacity: 7.5 L (1.9 gal). Check motor oil level after changing.

Oil filter changing. Oil filter part number: RE519626. Flush the filter housing before the filter element replacement procedure. When installation is complete, check the oil level. If required, add it.

Check engine primary air filter elements. Change if necessary. Air filter part number - AP33330.

Inspect engine secondary air filter element. Replace as required. Part number - AP33331.

Every 400 hours

Replace transmission/hydraulic fluid. Transmission/hydraulic fluid type - Hy-Gard, JDM J20C or J20D. Transmission and Hydraulic System Capacity: PowrReverser Models - 38.9 L (10.3 gal), eHydro Models - 36.1 L (9.6 gal). After adding transmission/hydraulic oil, check the level with a dipstick.

Changing transmission/hydraulic fluid filter. Fluid filter part number - LVA13038. When the filter is replaced, check the transmission/hydraulic fluid level. Add fluid if required.

Replace diesel fuel filter. Fuel filter part number - RE508202. Check injection pump settings.

Every 600 Hours

Change front axle fluid. Front axle oil - Hy-Gard. Front Axle Capacity - 5.0 L (1.3 gal).

Check in-line hydraulic filter. Part Number: LVA12726. Clean if required.

Yearly Maintenance

John Deere 4120 replacement parts

Engine Primary Air Filter. Part Number: AP33330
Engine Secondary Air Filter Element. Part Number: AP33331
Engine Oil Filter. Part Number: RE519626
Engine Fuel Filter. Part Number: RE508202
Transmission/Hydraulic Filter. Part Number: LVA13038
In-line Hydraulic Filter. Part Number: LVA12726
Alternator Belt. Part Number: R515222

Replace filter and engine oil. Service oil system components.

Install a new engine air cleaner elements.

Install a new transmission/hydraulic filter.

Change transmission/hydraulic oil.

Clean hydraulic in-line filter.

Drain water from fuel tank and replace fuel filters.

Clean radiator and oil cooler fins.

Drain, flush and refill engine cooling system. Cooling System Capacity: 6.2 L (1.6 gal).

Check all hoses and clamps.

Check and service the battery.

Check and adjust valve clearance.

Inspect and adjust diesel injector pump.