Satoh ST-4040
The Satoh ST-4040 is a tractor produced by Satoh. It is equipped with a 127.2 ci 2.1 L engine. The listed engine power is Diesel (listed): 39.5 hp / 29.5 kW. Transmission: 9 forward and 3 reverse. Drive type: 4x4 MFWD 2WD. Operating weight: 3748 lbs 1700 kg.
Engine Power
Diesel (listed): 39.5 hp / 29.5 kW
Drive & Traction
4x4 MFWD 2WD
Fuel & Capacities
12.2 gal
46.2 L
Transmission
9 forward and 3 reverse
Operating Weight
3748 lbs
1700 kg
Overview
 | 1977 - 1980
Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Satoh |
Utility tractor | |
Variants | |
|---|---|
ST4000 | 2WD |
ST4040 | 4WD |
Satoh ST-4040 Engine | |
|---|---|
Mitsubishi 2.1L 4-cyl diesel | |
Fuel tank | 12.2 gal
46.2 L |
Engine details ...  | |
Satoh ST-4040 Transmission | |
|---|---|
9-speed gear | |
Transmission details ...  |
Satoh ST-4040 Power | |
|---|---|
Engine | 39.5 hp
29.5 kW |
PTO (claimed) | 35.5 hp
26.5 kW |
Mechanical | |
|---|---|
Drive | 4x4 MFWD 2WD |
Open operator station. | |
Tractor hitch | |
|---|---|
Rear Type | JIS1 |
Control | position and draft control |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 540 (1.375) |
Engine RPM | 625@2400 |
837@2400 | |
1168@2400 | |
1466@2400 | |
Dimensions & Tires | |
|---|---|
Weight | 3748 lbs
1700 kg |
Rear tire | 12.4/11-28 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
Engine
Engine Detail — 127.2 ci / 2.1 L Diesel
Manufacturer | Mitsubishi 4DQ5 |
Fuel Type | Diesel |
Configuration | 4-cylinder, liquid-cooled |
Displacement | 127.2 ci
2.1 L |
Bore/Stroke | 3.31x3.70 inches
84 x 94 mm |
Power | 39.5 hp
29.5 kW |
Rated RPM | 2400 |
Torque | 92 lb-ft
124.8 Nm |
Torque RPM | 1600 |
Starter | electric |
Starter volts | 12 |
Oil capacity | 5.3 qts
5.0 L |
Coolant capacity | 8.5 qts
8.0 L |
Transmission
Transmission — 9 forward and 3 reverse gear
Type | gear |
Gears | 9 forward and 3 reverse |
Dimensions
Satoh ST-4040 Tires | |
|---|---|
Ag rear | 12.4/11-28 |
Dimensions | |
|---|---|
Length | 131.5 inches
334 cm |
Width | 60.6 inches
153 cm |
Weight | 3748 lbs
1700 kg |
Rear tread | 48 to 71.5 inches
121 to 181 cm |
Recommended Implements & Sizing Guide
Engineering recommendations for Satoh ST-4040 based on its 39.5 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 | 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. |
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 Satoh ST-4040.
Estimated Continuous Field Runtime: 5.9 hrs
Approximately 5.9 hours of continuous field operation at ~75% rated power on a full tank (12.2 gal / 46.2 L).
Estimated 75% Load Fuel Burn~2.1 gal/hr (7.8 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
Satoh ST-4040 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Satoh ST-4040.
Converted Equivalents:
Horsepower (HP)39.5 hp
Kilowatts (kW)29.5 kW
Metric Horsepower (PS / CV)40 PS
Direct Competitor Comparison
Compare Satoh ST-4040 against same-era industry alternatives in the same horsepower class.
Current Model
Satoh
Satoh ST-4040
Engine Power:Diesel (listed): 39.5 hp / 29.5 kW
★ Baseline Reference
Wisconsin TractorMarket Competitor
Wisconsin Tractor 16-32
Engine Power:35.6
Production Years:1920 - 1923
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