Ford 3900
The Ford 3900 is a tractor produced by Ford. It is equipped with a 175 ci 2.9 L engine. The listed engine power is Diesel (gross): 47 hp / 35.0 kW. Transmission: 8 forward and 2 reverse. Operating weight: 4766 lbs 2161 kg.
Engine Power
Diesel (gross): 47 hp / 35.0 kW
Fuel & Capacities
13 gal
49.2 L
Transmission
8 forward and 2 reverse
Operating Weight
4766 lbs
2161 kg
Overview
 | 1975 - 1981
Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Ford |
Utility tractor | |
Ford 3900 Engine | |
|---|---|
Ford 2.9L 3-cyl diesel | |
Fuel tank | 13 gal
49.2 L |
Engine details ...  | |
Ford 3900 Transmission | |
|---|---|
8-speed gear | |
Transmission details ...  |
Ford 3900 Power | |
|---|---|
Engine (gross) | 47 hp
35.0 kW |
Mechanical | |
|---|---|
Two-wheel drive | |
Differential lock | mechanical rear OptOptional |
Mechanical wet disc brakes | |
ROPS standard. Cab available. | |
Tractor hitch | |
|---|---|
Rear Type | I |
Control | position and draft control |
Rear lift | 3417 lbs
1549 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540 (1.375) |
Engine RPM | 540@1800 |
Dimensions & Tires | |
|---|---|
Wheelbase | 77.6 inches
197 cm |
Weight | 4766 lbs
2161 kg |
Front tire | 6.00x19 |
Rear tire | 12.4/11x36 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Charging system | alternator |
Charging amps | 28 |
Battery volts | 12 |
Battery AH | 128 |
References | |
|---|---|
 | |
3900 4100 4600 published in 1979, by Ford* | |
*Publication contains known errors. |
Engine
Engine Detail — 175 ci / 2.9 L Diesel
Manufacturer | Ford |
Fuel Type | Diesel |
Configuration | 3-cylinder, liquid-cooled |
Displacement | 175 ci
2.9 L |
Bore/Stroke | 4.20x4.20 inches
107 x 107 mm |
Power (gross) | 47 hp
35.0 kW |
Fuel system | indirect injection |
Air cleaner | dry |
Compression | 16.3:1 |
Rated RPM | 2000 |
Torque | 132.4 lb-ft
179.5 Nm |
Torque RPM | 1200 |
Starter | electric |
Starter volts | 12 |
Oil capacity | 7.4 qts
7.0 L |
Coolant capacity | 10.6 qts
10.0 L |
Transmission
Transmission — 8 forward and 2 reverse gear
Type | gear |
Gears | 8 forward and 2 reverse |
Clutch | 280mm dry disc |
Oil capacity | 13.7 qts
13.0 L |
 | |
Dimensions
Ford 3900 Tires | |
|---|---|
Standard tires (ag) | Front: 6.00x19. Rear: 12.4/11x36 |
Dimensions | |
|---|---|
Wheelbase | 77.6 inches
197 cm |
Length | 134.7 inches
342 cm |
Width | 73.2 inches
185 cm |
Height (ROPS) | 90.6 inches
230 cm |
Weight | 4766 lbs
2161 kg |
Recommended Implements & Sizing Guide
Engineering recommendations for Ford 3900 based on its 47 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm) | Medium Duty | Standard utility farm tillage. |
Rotary Cutter / MowerMowing & Clearing | 6 ft (72 in)1.8 m | Medium Duty | Medium pasture clearing; rear slip-clutch recommended. |
Rotary TillerSeedbed Prep | 66 to 72 in165 - 180 cm | Medium Duty | Standard utility tiller; slip clutch protection required. |
Disc HarrowSecondary Tillage | 7 to 8 ft Tandem Disc2.1 - 2.4 m 对开双排耙 | Medium Duty | Field leveling and clod breaking behind plows. |
Hay BalerHay & Forage | Small Square Baler (14x18")小方捆打捆机 (36x46 cm) | Medium Duty | Classic 2-string baler for horse and small livestock hay. |
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 Ford 3900.
Estimated Continuous Field Runtime: 5.3 hrs
Approximately 5.3 hours of continuous field operation at ~75% rated power on a full tank (13 gal / 49.2 L).
Estimated 75% Load Fuel Burn~2.4 gal/hr (9.3 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
Ford 3900 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Ford 3900.
Converted Equivalents:
Horsepower (HP)47 hp
Kilowatts (kW)35 kW
Metric Horsepower (PS / CV)47.7 PS
Direct Competitor Comparison
Compare Ford 3900 against same-era industry alternatives in the same horsepower class.
Current Model
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Ford 3900
Engine Power:Diesel (gross): 47 hp / 35.0 kW
★ Baseline Reference