Specifications, Service and Repair of Farm and Lawn Tractors

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John Deere 4120 Tractor Specs

JD 4120 Engine Specifications

Engine Model - John Deere 4024T
Cylinders - 4
Displacement, cu in (L) - 148.9 (2.44)
Engine Bore, in (mm) - 3.4 (86)
Engine Stroke, in (mm) - 4 (105)
Block Design, Replaceable Liners - Parent Bore
Aspiration, Turbocharged or Naturally Aspirated - Turbocharged
Engine Power, Rated, hp (kW) - 43 (31.6)
Engine Speed, rpm - 2400
Power Boost, hp (kW) - No boost
Fuel Tank, gal (L) - 14.5 (55)

Fuel System and Exhaust Treatment

Fuel System Description - In-Line Pump System
Fuel System Control - Mechanical
Fuel Injection to combustion chamber - Direct
Exhaust Pipe - Horizontal

Cooling System and Electrical System

Fan Drive Type - Belt
System Rating, Volts - 12
Alternator Rating, Amps - 70

John Deere 4120 Transmission

Description - Power Reverser
Transmission Type - Synchro Shuttle
Forward / Reverse Speeds - 12F / 12R
Maximum Speed Forward, mph (kph) - 17.3 (27.8)
Shuttle (Forward-Reverse) - Standard

Optional Transmission

Description - Twin Touch eHydro
Transmission Type - Hydrostatic
Forward / Reverse Speeds - Infinite, 3 range

JD 4120 PTO (Power take off)

PTO Horsepower, hp (kW) - 37 (27.6) / 35 (26.1)
PTO Speeds, rpm - 540
PTO operational Type - Independent

Wheels

Drive Wheels - 4WD
Tractor Steering Configuration - Front Steer
Wheelbase, 4WD, in (mm) - 71.5 (1816)
Front Tire Size, 4WD - 8.0x16 R1
Rear Tire Size - 13.6x28 R1

Rear Axle and Brakes

Final Drive - Planetary / Inboard
Axle Output End - Flange
Brake Type - Wet disc

John Deere 4120 Hydraulic System

Hydraulic System Type Open center
Main Hydraulic Pump Type Gear
Standard Pump Flow, gpm (Lpm) 17.1 (64.6)
Tractor 3-Point Hitch Features

Hitch

3-Point Hitch Category - Category 1
Draft Sensing or Lift Control - Position Control
Draft Link Ends Adjustable - Yes
Standard Lift Capacity 24 Inches behind pin, lb (kg) - 2,500 (1134)
Standard Lift Capacity at lift pin, lb (kg) - 3,130 (1419)

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