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John Deere 2120 Maintenance

The John Deere 2120 tractor was manufactured between 1969 and 1972. The JD 2120 powerline components: John Deere four stroke 4-cylinder direct injection liquid-cooled diesel engine and 8x4 unsynchronized gear transmission, or two-speed power shift transmission with 16 forward and 8 reverse gears.

A 219 cubic inches (3.6 L) engine has a cylinder bore of 4.02" (102 mm), piston stroke of 4.33" (110 mm), rated power of 68 hp (50.7 kW), and maximum torque of 69.6 Nm (51.3 lb-ft) at 1500 rev/min. Max. forward speed - 18.6 mph (29.9 kph), max. reverse speed - 8.1 mph (13 kph).

The closed center hydraulic system used a piston pump with a flow rate of 12.4 gal/min (46.9 liters per minute). The hydraulic pressure is 155 bar (2250 psi). The John Deere 2120 is equipped with a power assist steering, differential hydraulic wet disc brakes, 7.50x16 front tires and 15.5x38 rear tires. The wheelbase is 86 inches (2180 mm).

Refill Capacities
Engine oil capacity, gal (L) 1.5 (5.7)
Engine coolant capacity, gal (L) 3.0 (11.4)
Hydraulic/transmission system capacity, gal (L) 10.0 (38.0)
Belt pulley oil capacity, qts (L) 1.2 (1.1)

Recommended Oil and Fluid
Engine oil type Torq-Gard, SAE 30, SAE 10W-30, 20W-40. API Service category DM, DS
Engine coolant type Cool-Gard Premix Coolant
Hydraulic/Transmission fluid type JD 303 Special-Purpose Oil
Belt pulley oil type JD 303 Special-Purpose Oil, SAE 80

Service Intervals
Check hydraulic/transmission fluid level Every 50 hours
Lubricate axle hub bearings Every 50 hours
Clean battery and check electrolyte level Every 50 hours
Change engine oil Every 250 hours
Replace engine oil filter Every 250 hours
Inspect and adjust generator/fan belt Every 250 hours
Check belt pulley oil level Every 250 hours
Clean air cleaner oil cup or dry element Every 250 hours
Change engine fuel filter Every 500 hours
Check injection timing Every 500 hours
Check manual steering gear oil level Every 500 hours
Replace hydraulic/transmission oil filter Every 500 hours
Change belt pulley oil Every 500 hours
Check and adjust engine idling Every 500 hours
Check and adjust valve clearance Every 500 hours
Change hydraulic/transmission fluid Every 1000 hours
Clean and adjust wheel bearings Every 1000 hours
Clean hydraulic pump valve filter Every 1000 hours
Replace air cleaner dry element Every 1200 hours
Flush cooling system and add new coolant Every 1200 hours

Replacement Parts
Engine oil filter part number T19044
Engine fuel filter part number AT31064, AT13379, AR66294
Engine air cleaner part number AT20240 (oil bath), AR84228/AE31724 (dry element)
Hydraulic/transmission oil filter part number AR75603
Hydraulic filter element part number AL71020, R27173




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