John Deere 3120
The John Deere 3120 is a tractor produced by John Deere. It is equipped with a 91.5 ci 1.5 L engine. The listed engine power is Diesel (listed): 29.5 hp / 22.0 kW. Transmission: Sauer-Danfoss eHydro. Operating weight: 1047 lbs 474 kg.
Engine Power
Diesel (listed): 29.5 hp / 22.0 kW
Fuel & Capacities
13.5 gal
51.1 L
Transmission
Sauer-Danfoss eHydro
Operating Weight
1047 lbs
474 kg
Overview
 | 2005 - 2008
3000 Twenty SeriesCompact Utility tractor
3000 Twenty Series
Compact Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | John Deere |
Compact Utility tractor | |
Built in Augusta, Georgia, USA | |
John Deere 3120 Engine | |
|---|---|
Yanmar 1.5L 3-cyl diesel | |
Engine details ...  |
John Deere 3120 Transmission | |
|---|---|
hydrostatic | |
Transmission details ...  |
John Deere 3120 Power | |
|---|---|
Engine | 29.5 hp
22.0 kW |
Mechanical | |
|---|---|
Four-wheel drive | |
Steering | power |
Wet disc brakes | |
Two-post folding ROPS. | |
Capacity | |
|---|---|
Fuel | 13.5 gal
51.1 L |
Hydraulic system | 6.8 gal
25.7 L |
Hydraulics | |
|---|---|
Type | open center |
Capacity | 6.8 gal
25.7 L |
Valves | 5 |
Pump flow | 8.6 gpm
32.6 lpm |
Total flow | 13.9 gpm
52.6 lpm |
Tractor hitch | |
|---|---|
Rear Type | I |
Rear lift (at ends) | 2530 lbs
1147 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540 |
Mid PTO | optional |
Mid PTO Type | 2100 |
Dimensions & Tires | |
|---|---|
Wheelbase | 68 inches
172 cm |
Weight | 3000 lbs
1360 kg |
Front tire | 7-14 |
Rear tire | 11.2-24 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging amps | 40 |
Battery CCA | 500 |
Battery volts | 12 |
References | |
|---|---|
 | |
Commercial & Consumer Equipment Purchasing Guide published in 2007, by John Deere | |
3000 Series published in 2008, by John Deere | |
3000 Twenty Series Compact Tractors published in 2005, by John Deere | |
3000 Twenty Series Tractors Product Information Handbook published in 2004, by John Deere | |
Commercial & Consumer Equipment Purchase Guide published in 2005, by John Deere |
Engine
Engine Detail — 91.5 ci / 1.5 L Diesel
Manufacturer | Yanmar 3TNV84 |
Fuel Type | Diesel |
Configuration | 3-cylinder, liquid-cooled |
Displacement | 91.5 ci
1.5 L |
Bore/Stroke | 3.3x3.54 inches
84 x 90 mm |
Emissions | Tier II |
Power | 29.5 hp
22.0 kW |
Fuel system | direct injection |
Compression | 18.5:1 |
Rated RPM | 2600 |
Torque | 66.7 lb-ft
90.4 Nm |
Torque RPM | 1560 |
Starter volts | 12 |
Oil capacity | 5.1 qts
4.8 L |
Coolant capacity | 5.6 qts
5.3 L |
Transmission
Transmission — Sauer-Danfoss eHydro
Transmission | Sauer-Danfoss eHydro |
Type | hydrostatic |
Gears | infinite forward and reverse (3-range) |
Controlled by two foot pedals and range shift lever. Tractor must be stopped before shifting ranges. Cruise control standard. SpeedMatch allows maximum speed to be limited. MotionMatch allows acceleration rate to be set. LoadMatch allows engine RPMs to be set, tractor will adjust speed to maintain RPMs. | |
With 11.2-24 rear tires. | |
 | |
Dimensions
John Deere 3120 Tires | |
|---|---|
Ag front | 7-14 |
Ag rear | 11.2-24 |
Lawn/turf front | 27x8.5-15 |
Lawn/turf rear | 41x14-20 |
Lawn/turf front | 25x10.5LL-15 |
Lawn/turf rear | 41x18LL-16.1 |
Industrial front | 25x8.5-14 |
Industrial rear | 15-19.5 |
Industrial front | 27x8.5-15 |
Industrial rear | 43x16-20 |
Dimensions | |
|---|---|
Wheelbase | 68 inches
172 cm |
Length | 120.2 inches
305 cm |
Width | 52.4 inches*Minimum
133 cm |
Height (hood) | 57 inches
144 cm |
Height (ROPS) | 93.3 inches
236 cm |
Weight | 3000 lbs
1360 kg |
Clearance (rear axle) | 12.2 inches
30 cm |
Rear tread | 40.6/45.3/48.9/53.1/56.6 inches
103/115/124/134/143 cm |
Attachments
Attachment overview | |
|---|---|
60" mid-mount mower deck | |
John Deere 300X loader | |
John Deere 300CX loader | |
Backhoe |
60" Mower deck | |
|---|---|
Type | mid-mount John Deere |
3-blade | |
Cutting width | 60 inches
152 cm |
John Deere 47 Backhoe | |
|---|---|
Backhoe type | John Deere 47 Backhoe |
Weight | 1047 lbs
474 kg |
2-Foot flat digging depth | 90 inches
228 cm |
Reach from pivot | 114 inches
289 cm |
Loading height | 70 inches
177 cm |
Bucket Rotation | 180° |
Swing Arc | 180° |
Bucket force | 2840 lbs
1288 kg |
Dipperstick force | 2005 lbs
909 kg |
Recommended Implements & Sizing Guide
Engineering recommendations for John Deere 3120 based on its 29.5 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 1 to 2 Bottom (12")1 - 2 铧 (30 cm) | Light Duty | Ideal for garden plots and light sandy soil. |
Rotary Cutter / MowerMowing & Clearing | 5 ft (60 in)1.5 m | Medium Duty | Pasture maintenance and weeds up to 1.5" diameter. |
Rotary TillerSeedbed Prep | 54 to 60 in135 - 150 cm | Medium Duty | Thorough seedbed preparation in orchards and vegetable plots. |
Disc HarrowSecondary Tillage | 5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片) | Light Duty | Small acreage soil break-up and secondary aeration. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for John Deere 3120.
Estimated Continuous Field Runtime: 8.8 hrs
Approximately 8.8 hours of continuous field operation at ~75% rated power on a full tank (13.5 gal / 51.1 L).
Estimated 75% Load Fuel Burn~1.5 gal/hr (5.8 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
John Deere 3120 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for John Deere 3120.
Converted Equivalents:
Horsepower (HP)29.5 hp
Kilowatts (kW)22 kW
Metric Horsepower (PS / CV)29.9 PS
Direct Competitor Comparison
Compare John Deere 3120 against same-era industry alternatives in the same horsepower class.
Current Model
John Deere
John Deere 3120
Engine Power:Diesel (listed): 29.5 hp / 22.0 kW
★ Baseline Reference
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