Scroll down to see information on the factory specs for the Engine, Transmission, PTO, Chassis, Weight, Tires, and Speed.

Engine:

Type: “in series” 4 cylinder Gasoline / Carbureted. All engine specs are for the PB 100 unless otherwise noted. The TA/TB motor was only slightly larger and more powerful. Tractor specs remain the same.

Engine Power:
◾Max Horse Power: 25 HP @ 2800 rpm (PB 100) -or- 27 HP @ 2800 (TA/TB)
◾Rated Horse Power: 23 HP @ 2800 rpm (PB 100)
◾Max Torque: 46.9 ft-lb @ 2200 rpm

PTO Power:
◾Horsepower: 23 HP @ 2800rpm
◾Torque: 46.9 ft-lb @ 2400 rpm

Displacement:
◾60.2 ci / 1.0L / 987cc (PB 100) -or- 71.3 ci 1.2L / 1169cc (TA/TB)

Bore/Stroke:
◾2.677 x 2.677 in (PB 100) -or- 2.8 x 3.0 in (TA/TB)

Compression:
◾Ratio: 8.6:1 (PB 100 and TA/TB)
◾Pressure: 145 lb.in^2 (10.2 kg/cm^2)

RPM:
◾Rated: 2800
◾Maximum: 3150

Valves:
◾Position: Overhead Valve System
◾Valve Clearance: Intake / Exhaust – 0.010in (.25mm)

Electrical:
◾12v System, Negative Ground
◾Ignition Order: 1, 3, 4, 2

Air Cleaner:
◾Oil Bath with pre filter

Cooling:
◾Liquid Cooled
◾Geared wing water pump
◾Thermostat: 180*F begins to open, 258*F fully open

A Real World Satoh Bison Tractor Test has been conducted by The University of Nebraska. Here is a link to their findings:

http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=2476&context=tractormuseumlit

Transmission:

Type: dual speed un-synchronized gear

Forward Gears: 6 (3 Low / 3 Hi)

Reverse Gears: 2 (1 Low / 1 Hi)

Clutch:
◾Type: Single Dry Disk
◾Diameter: 7.25 in (184.2 mm)

Power Take Off:

Type: Dual Speed

Lever Down (Low): 540 RPM

Lever Up (High): 1000 RPM

Hydraulic System:

Type:
◾One Cylinder

Pressure of Relief Valve Setting:
◾1365 +/- 71.10 lb/in^2 (115 +/- 5 kg/cm^2)

Maximum Lift Power at Lower Link:
◾1,102.5 lb (500kg)

Diameter of Ram Piston:
◾2.76 in (70mm)

Stroke of Ram Piston:
◾3.15 in (80mm)

Material of Ram Piston:
◾Cast Iron FC-25

Type of Hydraulic Pump:
◾Pressure Loading Type

Name and Model of Hydraulic Pump:
◾KAYABA-DOWTY, GP-1

Output of Hydraulic Pump:
◾4.1 gal/min (17 ltr/min) @2800 engine rpm

Control Valve (Height Control):
◾Spool Valve, Pilot Type

Lock Valve:
◾In-line Non-return Valve (Automatic Flow Control)

Control Valve (Sub-Control):
◾Spoool Valve, 3-way Flow Change Type

Strainer Mesh:
◾100 meshes

Hydraulic Oil:
◾Turbine Oil No 120 (Capacity .92 gal – 3.5 lit)

Wheelbase/Chassis:

Wheelbase: 60.43 in

Steering: Mechanical

Brakes: Independent differential mechanical internal expanding shoe

Weight:

2105 lbs (no weights/loader/implement) / 3640 lbs (with ballased wheel weights)

Tires:

Front: 5.00 – 15

Rear: 11.2 – 24

Speed Information:

Low Selector 1st Gear: 0.853 mph

Low Selector 2nd Gear: 1.220 mph

Low Selector 3rd Gear: 4.620 mph

Low Selector Reverse: 1.600 mph

High Selector 1st Gear: 1.636 mph

High Selector 2nd Gear: 2.337 mph

High Selector 3rd Gear: 8.843 mph

High Selector Reverse: 3.076 mph