John Deere 4120 Specs, Price & Review ❤️️

John Deere 4120 Specs, Oil capacity, Features, Price & Review

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John Deere 4120

About John Deere 4120

The 4120 from John Deere is a compact utility tractor with four-wheel drive. From 2004 to 2014, this tractor was made by John Deere in Augusta, Georgia, in the United States.

The JD 4120 has a 2.4 L turbocharged diesel engine with four cylinders and either a power shuttle transmission with 12 forward and 12 reverse gears or a hydrostatic transmission with an infinite number of forward and reverse gears.

The John Deere 4024T engine was in the John Deere 4120 small utility tractor. It has a 2.4 L, 2,440 cm2, 148.9 cuin, four-cylinder turbocharged diesel engine with a cylinder bore of 3.39 inches and a piston stroke of 4.13 inches. The ratio of compression is 20.0:1.

This engine made 43.0 PS (31.6 kW; 42.4 HP) of power at 2,400 rpm and 148.0 Nm (15.1 kgm; 109.1 ftlb) of torque at 1,440 rpm.

The J 4120 has power steering, wet disc brakes, an open operator station with ROPS, and a fuel tank that holds 55.0 liters (14.5 US gal; 12.1 Imp. gal).

John Deere 4120 Price

John Deere 4120 Original Price: $26,900.00 USD

John Deere 4120 Oil Capacity

John Deere 4120 oil capacity is 7.9 qts 7.5 L

John Deere 4120 Quick Specs

  • Manufacturer:  John Deere
  • Engine Power:  43
  • Fuel Capacity:  14.5
  • Transmission:  12F/12R
  • Drive Wheels:  MFWD
  • Total Hydraulic Output:  17.1 gpm

John Deere 4120 Features

  • 43HP John Deere PowerTech Turbocharged Diesel Engine
  • Hydraulic System with Dual Gear Pumps
  • Gear Transmission (Standard) with the option of Hydrostatic
  • Safety and Comfort

John Deere 4120 Specs

General information and Service Manual

Make John Deere
Model 4120
Company Country United States
Production years From 2004  Until 2014
Tractor type Compact Utility tractor
Fuel diesel
Total build

Engine size 148.9 ci or 2.4 L
Number of cylinders 4 cylinders
Horsepower 43.1 hp or 32.1 kW
Power RPM 2400 (rpm)
Engine torque
Engine torque RPM
Fuel type diesel
Fuel tank capacity 14.5 gal or 54.9 L
Compression ratio 20:1
Bore stroke 3.386×4.134 inches or (86 x 105 mm)
Oil tank capacity 7.9 qts or 7.5 L
Coolant tank capacity 6.4 qts or 6.1 L

Transmission system eHydro
Transmission type hydrostatic
Transmission gears infinite forward and reverse
Oil tank capacity 38.4 qts or 36.3 L

Hydraulic system open center
Pump flow rate 12 gpm or 45.4 lpm
Steering flow rate 5.1 gpm or 19.3 lpm
Hydraulic tank capacity 10.3 gal or 39.0 L
Hydraulic pressure 2500 psi or 172.4 bar
Hydraulic max flow 17.1 gpm or 64.7 lpm

Hitch control system
Rear hitch I
Rear hitch lift 3,130 lbs or 1419 kg

AG front tires 8.00-16
AG rear tires 13.6-28
Weight 3700 lbs or 1678 kg
Length 128.2 inches [325 cm]
Width 65.6 inches [166 cm] (R1 tires) to 91.9 (R4 tires)
Height 97.2 inches [246 cm]
Wheelbase 71.5 inches [181 cm]
Ground clearance

Number of batteries 1
Battery voltage 12 V
Battery cold cranking Amps 770
Electric ground force negative
Electric charging system alternator
Electric charging Amps 75 amps
Engine starter volts 12 V

Wheel drive 4×4 MFWD 4WD
Steering system hydrostatic power
Braking system
Cabin type ROPS

PTO claimed power 35 hp or 26.1 kW
PTO clutch system
Rear PTO system independent
Rear PTO RPM 540 (rpm)
Front PTO system
Mid-PTO system independent
Mid PTO RPM 2100 (rpm)
PTO fuel consumption

John Deere 4120 Review Video

John Deere 4120 Attachments

John Deere 400X Loader

Loader weight: 927 lbs
420 kg
Height (to pin): 112.8 inches
286 cm
Dump reach: 24.7 inches
62 cm
Dump angle: 46°
Rollback angle: 31°
Breakout force (at pin): 3506 lbs
1590 kg
Breakout force (at 500mm): 2641 lbs
1197 kg
Lift to full height (at pin): 2368 lbs
1074 kg
Lift to full height (at 500mm): 1742 lbs
790 kg
Lift to 1.5m (at pin): 2634 lbs
1194 kg
Lift to 1.5m (at 500mm): 2181 lbs
989 kg
Raise time to height: 3.68 s
Bucket dump time: 2.44 s
Lowering time: 2.48 s
Rollback time: 1.44 s

John Deere 400CX (MSL) Loader

Loader weight: 1100 lbs
498 kg
Height (to pin): 110.9 inches
281 cm
Dump reach: 27.5 inches
69 cm
Dump angle: 45°
Rollback angle: 41°
Breakout force (at pin): 3512 lbs
1593 kg
Breakout force (at 500mm): 3159 lbs
1432 kg
Lift to full height (at pin): 2194 lbs
995 kg
Lift to full height (at 500mm): 2339 lbs
1060 kg
Lift to 1.5m (at pin): 2627 lbs
1191 kg
Lift to 1.5m (at 500mm): 2576 lbs
1168 kg
Raise time to height: 3.68 s
Bucket dump time: 1.6 s
Lowering time: 2.48 s
Rollback time: 1.1 s

John Deere 485 Backhoe

Backhoe type: John Deere 485 Backhoe
Weight: 1460 lbs
662 kg
Transport height: 90 inches
228 cm
Digging depth: 105 inches
266 cm
Reach from pivot: 142 inches
360 cm
Loading height: 88 inches
223 cm
Bucket Rotation: 180
Swing Arc: 180
Bucket force: 3730 lbs
1691 kg
Dipperstick force: 2435 lbs
1104 kg

John Deere 4120 Problems

Cold Start Issues

When the temperature drops below 30 degrees Fahrenheit, the JD 4120 is hard to start. You may have changed the filters, added algicide, and gel-preventing additives, and done any other troubleshooting that needed to be done.

But most of the time, the problem won’t go away even if you change the batteries and service the glow plugs. If it does start, it makes a lot of white smoke and stumbles around before it settles down and runs smoothly.

Hydrostatic Problems

The hydrostatic issues show up as a small “jerk.” As the tractor gets hotter, the “jerk” happens more often. It feels like the wheels were locked for a short time and then let go. You might find engine oil that is dirty.

But changing the filters, oils, and suction filter while the gearbox and hydraulic oil are out of the tractor may not fix the problem.

It will happen in both 2-wheel drive and 4-wheel drive vehicles. It happens no matter if the PTO is turned on or not. Whether the loader is being used or not (or installed).

You might also get an 08 code for the throttle sensor. You may also get a voltage signal that is out of range or not calibrated, no anti-stall feature, a drop in performance, etc.

Fuel Injector Issues

You might see a lot of smoke coming from the tailpipe. There may not be enough power coming from all the engines. The problem could be a faulty fuel injector or a leak of some kind.

Failure Under Load

When the load switch is set to “on” on a 4120, the drive won’t move the tractor until the tractor is running at 1500 RPMs or more. It’s because of the load match.

The dashboard may show the error code 01. The tractor won’t go forward or backward anymore. It could be that the potentiometer for the forward pedal is broken.

It might be broken or need to be turned back on. Furthermore, something could have caught on a wire under the tractor if you’ve been driving through bushes and pulled it free. Wires aren’t always tucked away and tied down correctly.

Sensor Problems

If the tractor is hard to start when it’s cold, that’s a big sign that the sensors are broken. The engine will turn on, and then it will stop. You will have to crank it a lot to get it going again.

Also, the engine revs up and down by about 300 RPM whether the load match is turned on or not. This could be because the MFWD speed sensor is broken.

The fuel shut-off solenoid or the wires that go to it could be the problem. The tractor will stop all of a sudden without changing speeds.

You might have to take your whole foot off the pedal before it will move again. This appears to happen even when there is no load.

There are error codes for when the forward and reverse pedal sensors are above or below normal or out of range/out of calibration. It means that a pedal was connected to the ground or a higher voltage.

Errors can be found with the instrument controller, which is also called the dashboard or ICC. Don’t forget to add the transmission control unit (TCU). The dashboards of all of them have screens.

If the seat sensor was broken, the tractor would stop and not move until the hydro pedal was pushed all the way down. There would probably not be an error code.

How To Fix John Deere 4120 Problems

Cold Start Issues

This is how the 4-cylinder JD acts in the winter, which is not good. There may also be problems with the PTO, the seat safety switch, etc. If so, they will have to be changed.

Instead of a glow plug, put in an intake warmer to fix the problem in the winter. To warm up the air, turn the key in for 15 seconds. Also, turn on the tractor while holding the key, and keep holding it until the engine runs smoothly.

Before it starts to run smoothly, it stutters for about 10 to 15 seconds. Also, if you slightly open the throttle right before starting the tractor, it will go faster and smoother.

Hydrostatic Problems

It could be the brakes or the brake sensors. Or the heat from a solenoid. The problem stops for a short time the flow of hydraulic fluid that drives the wheels.

Turn off the Loadmatch and see if that solves the problem. Next, check the oil cooler’s LVA14167 inline oil filter. Check to see if the screen is broken.

Check the two hydraulic pumps’ suction lines. If there is oil on the rubber tube near the pumps or at the end where the filter is, the hydrostatic charge pump might be sucking in the air.

Change the clamps on the rubber tube to worm/screw clamps made of stainless steel. Then, make sure that the manifold that connects the two pumps is tightly attached to each pump. If nothing else works, you should ask the dealer to check the MFWD sensor.

It could also be your front axle. Last, look for broken parts. It could also be the sensors for the seat and pedals.

Fuel Injector Issues

This problem can be fixed by getting a new set of fuel injectors. If bad fuel gets past the filter, it can damage the fuel injectors.

Failure Under Load

You can’t do much about the load match. It’s the way this tractor is made. Check the PTO clutch, front and backpedals, solenoid, O-rings, wires, and other parts for problems. If you need to, replace it.

Load match is a good anti-theft feature and a better governor that is controlled by the CPU. Its job is to make sure the RPM doesn’t stop. Use it only in gears A and B, and only at high RPMS (2000 or up).

Sensor Problems

Test each sensor to find out what it is. When broken, replace.


That’s all there is to know about the John Deere 4120 Tractor Price, Specs, Review, and Key Features; nevertheless, if you have any questions about this topic, kindly put them in the comment section below. We will respond to your inquiry as soon as we can.

John Deere 4120 FAQ

How many HP is a John Deere 4120?

John Deere 4120 engine produces a 43.1 hp 32.1 kW

What engine is in a John Deere 4120?

John Deere 4120 has a liquid-cooled engine 

How much can a John Deere 4110 Lift?

John Deere 4120 lift capacity is 618 lbs 280 kg


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