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Kubota B5100 Tractor

The Kubota B5100 is a two-wheel drive or four-wheel drive sub-compact utility tractor. This model was manufactured between 1978 and 1984. The tractor was designed in 2 versions: B5100E (2WD) and B5100DT (4WD).

The Kubota B5100 is equipped with a 31 cu.in (0.5L) Kubota Z500-1A 4-cycle 2-cylinder liquid-cooled naturally aspirated diesel engine. The engine has a cylinder bore of 2.63" (67 mm), piston stroke of 2.76" (70 mm), maximum power of 12 hp (8.9 kW), and 28.1 Nm (20.7 lb-ft) of max torque at 1800 rpm.

The mechanical transmission consists of a dry clutch and unsynchronized gearbox with six forward and two reverse gears. The maximum forward speed - 8 mph (12.8 km/h), maximum reverse speed - 4 mph (6.4 km/h). The Kubota B5100 was equipped with a ball screw type manual steering, differential mechanical shoe brakes, 4.00x9 (2WD) or 4.50x10 (4WD) front tires, and 7.00x16 rear tires. The wheelbase is 46.6 in (1180 mm).

Engine Model Kubota Z500-1A
Engine Type 4-cycle 2-cylinder liquid-cooled diesel
Number of Cylinders Two
Displacement, cu.in (L) 31 (0.51)
Engine Bore, in (mm) 2.63 (67.0)
Engine Stroke, in (mm) 2.76 (70.0)
Aspiration Naturally aspirated
Rated Engine Power, hp (kW) 12.0 (8.9)
Rated Engine Speed, rpm 3000
Maximum Torque, Nm (lb-ft) 28.1 (20.7)
Torque Speed, rpm 1800
Idle Speed, rpm 800
Compression Ratio 22:1
Firing Order 1-2
Fuel System Injection pump
Fuel Injection Pump Bosch K type mini pump
Injection Nozzle Bosch throttle type
Lubrication System Forced lubrication by trochoidal pump
Cooling System Water with pressurized radiator
Fuel Tank Capacity, gal (L) 2.1 (8.0)
Oil Capacity, qts (L) 2.4 (2.3)
Coolant Capacity, qts (L) 3.2 (3.0)
Electrical System Rating, Volts 12

Power Take-Off
PTO Operational Type Transmission
PTO Horsepower, hp (kW) 10.0 (7.5)
Rear PTO Speed, rpm 540/1000
Front PTO Speed, rpm 3000

Transmission Type Unsynchronized gear
Gearbox Type 6F/2R, gear shift
Number of Forward Gears 6
Number of Reverse Gears 2
Clutch Type Dry disc
Oil Capacity, qts (L) 9.0 (8.5)
Maximum Forward Speed, mph (kph) 8.0 (12.8)
Maximum Reverse Speed, mph (kph) 4.0 (6.4)

Wheels and Tires
Drive Wheels 2WD/4WD
Steering Configuration Front steer
Steering System Manual, ball screw type
Brake Type Differential mechanical shoe
Front Tire Size (2WD) 4.00x9
Rear Tire Size (2WD) 7.00x16
Front Tire Size (4WD) 4.50x10
Rear Tire Size (4WD) 7.00x16
Front Tire Size (Turf) 18x6.50-8
Rear Tire Size (Turf) 27x8.50-15
Front Tread (2WD), in (mm) 26.4 (670)
Front Tread (4WD), in (mm) 26 (660)
Rear Tread, in (mm) 25-29 (640-740)

Dimensions and Weight
Wheelbase, in (mm) 46.6 (1180)
Length, in (mm) 71.6 (1810)
Height, in (mm) 44.1 (1120)
Overall Width, in (mm) 36.3 (920)
Ground Clearance (2WD), in (mm) 10.3 (260)
Ground Clearance (4WD), in (mm) 8.6 (220)
Turning Radius (2WD), in (mm) 65 (1650)
Turning Radius (4WD), in (mm) 66 (1675)
Weight (2WD), lb (kg) 805 (365)
Weight (4WD), lb (kg) 893 (405)



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