Satoh Bison S650
The Satoh Bison S650 is a tractor produced by Satoh. It is equipped with a 60.2 ci 1.0 L engine. The listed engine power is Gasoline (listed): 25 hp / 18.6 kW. Transmission: 6 forward and 2 reverse. Operating weight: 2105 lbs 954 kg.
Engine Power
Gasoline (listed): 25 hp / 18.6 kW
Fuel & Capacities
9.5 gal
36.0 L
Transmission
6 forward and 2 reverse
Operating Weight
2105 lbs
954 kg
Overview
 | 1973 - 1983
Compact Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Satoh |
Compact Utility tractor | |
Built in Japan | |
Satoh S650 Engine | |
|---|---|
Mazda 1.0L 4-cyl gasoline | |
Fuel tank | 9.5 gal
36.0 L |
Engine details ...  | |
Satoh S650 Transmission | |
|---|---|
6-speed unsynchronized gear | |
Transmission details ...  |
Satoh S650 Power | |
|---|---|
Engine | 25 hp
18.6 kW |
PTO (claimed) | 22 hp
16.4 kW |
Drawbar (tested) | 18.16 hp
13.5 kW |
PTO (tested) | 22.03 hp
16.4 kW |
Performance test details ...  | |
Mechanical | |
|---|---|
Two-wheel drive | |
Final drives | spur gear |
Manual steering | |
Differential mechanical internal expanding shoe brakes | |
Open operator station. | |
Tractor hitch | |
|---|---|
Rear Type | I |
Rear lift | 1102 lbs
499 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 540/1000 |
Engine RPM | 540@2800 |
Dimensions & Tires | |
|---|---|
Wheelbase | 60.4 inches
153 cm |
Weight | 2105 lbs
954 kg |
Front tire | 5.00-15 |
Rear tire | 11.2/10-24 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging system | alternator |
Battery volts | 12 |
References | |
|---|---|
 | |
Satoh Gasoline Tractors published in 1975 | |
S-650G Instruction Book |
Engine
Engine Detail — 60.2 ci / 1.0 L Gasoline
Manufacturer | Mazda |
Fuel Type | Gasoline |
Configuration | 4-cylinder, liquid-cooled |
Displacement | 60.2 ci
1.0 L |
Bore/Stroke | 2.677x2.677 inches
68 x 68 mm |
Power | 25 hp
18.6 kW |
Air cleaner | oil bath |
Compression | 8.6:1 |
Rated RPM | 2800 |
Starter | electric |
Starter volts | 12 |
Oil capacity | 3.2 qts
3.0 L |
Coolant capacity | 5 qts
4.7 L |
Transmission
Transmission — 6 forward and 2 reverse unsynchronized gear
Type | unsynchronized gear |
Gears | 6 forward and 2 reverse |
Clutch | dry disc |
Oil capacity | 18.9 qts
17.9 L |
Three gears (1-3) in two ranges (low-high). | |
 | |
Dimensions
Satoh S650 Tires | |
|---|---|
Ag front | 5.00-15 |
Ag rear | 11.2/10-24 |
Lawn/turf front | 20x8-10 |
Lawn/turf rear | 13.6-16.5 |
Dimensions | |
|---|---|
Wheelbase | 60.4 inches
153 cm |
Length | 105.1 inches
266 cm |
Width | 52.9 inches
134 cm |
Height (steering wheel) | 54.7 inches
138 cm |
Operating weight | 2105 lbs
954 kg |
Ballasted weight | 3640 lbs
1651 kg |
Ground clearance | 13.9 inches
35 cm |
Front tread | 40.9 to 52.8 inches
103 to 134 cm |
Rear tread | 40 to 51.7 inches
101 to 131 cm |
Tests
Nebraska Tractor Test 1106 | |
|---|---|
Gasoline 6-speed 2WD
September 4 - 12, 1972
Link: Nebraska Tractor Test 1106 file | |
PTO performance | |
Power at rated engine speed | 22.03 hp
16.4 kW |
Fuel use | 2.2 gal/hour
8.3 l/hour |
Power at rated PTO speed | 21.48 hp
16.0 kW |
Fuel use | 2.2 gal/hour
8.3 l/hour |
Drawbar performance | |
Max power | 18.16 hp
13.5 kW |
Fuel use | 2.1 gal/hour
7.9 l/hour |
Max pull | 2,794 lbs
1267 kg |
Photos
Satoh S650G compact utility tractor.
Satoh S650G compact utility tractor.
Satoh S650G operator station and controls.
Recommended Implements & Sizing Guide
Engineering recommendations for Satoh Bison S650 based on its 25 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 Satoh Bison S650.
Estimated Continuous Field Runtime: 7.3 hrs
Approximately 7.3 hours of continuous field operation at ~75% rated power on a full tank (9.5 gal / 36 L).
Estimated 75% Load Fuel Burn~1.3 gal/hr (4.9 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 Bison S650 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Satoh Bison S650.
Converted Equivalents:
Horsepower (HP)25 hp
Kilowatts (kW)18.6 kW
Metric Horsepower (PS / CV)25.3 PS
Direct Competitor Comparison
Compare Satoh Bison S650 against same-era industry alternatives in the same horsepower class.
Current Model
Satoh
Satoh Bison S650
Engine Power:Gasoline (listed): 25 hp / 18.6 kW
★ Baseline Reference
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