Overview
The Kubota B5100 is a Japanese-built sub-compact utility tractor produced from 1978 to 1984, available in 2WD (B5100E) and 4WD (B5100DT) variants. It is powered by a 0.5L two-cylinder liquid-cooled diesel engine rated at 12 hp, paired with an unsynchronized 6-speed gear transmission. The machine features a Category I rear hitch with a 300-pound lift capacity and dual-speed 540/1000 RPM rear PTO.
Ideal Applications
Engine and PTO Performance:
The Z500-1A diesel engine operates at a rated 3000 RPM to deliver a claimed 10 hp at the PTO, supported by a 12V electrical system and glow plug pre-heating.
Transmission and Drive Configuration:
The mechanical drivetrain consists of an unsynchronized gear transmission with six forward and two reverse speeds, a dry disc clutch, and a mechanical rear differential lock.
Chassis and Hydraulic Specifications:
Built on a 46.5-inch wheelbase with a width of 36.25 inches, the tractor utilizes an open center hydraulic system with a 3.17 gpm pump flow to operate its 300-pound capacity rear lift.
Production
| Description | Sub-Compact Utility tractor / Built in Japan |
|---|---|
| Manufacturer | Kubota |
Engine
| Engine type | Kubota 0.5L 2-cyl diesel |
|---|---|
| Fuel tank | 2.1 gal (7.9 L) |
| Bore/Stroke | 2.625x2.75 inches (67 x 70 mm) |
| Coolant capacity | 3.2 qts (3.0 L) |
| Description | Kubota Z500-1A / diesel / 2-cylinder / liquid-cooled |
| Displacement | 31 ci (0.5 L) |
| Power | 12 hp (8.9 kW) |
| Pre-heating | glow plugs |
| Rated RPM | 3000 |
| Starter power | 1.1 hp (0.8 kW) |
| Starter volts | 12 |
| Oil capacity | 2.4 qts (2.3 L) |
| Oil change | 75 h |
| PTO (claimed) | 10 hp (7.5 kW) |
Transmission
| Clutch | dry disc |
|---|---|
| Description | Three gears, plus reverse, in two ranges. |
| Gears | 6 forward and 2 reverse |
| Oil capacity | 9.0 qts (8.5 L) |
| Transmission type | 6-speed unsynchronized gear |
| Type | unsynchronized gear |
Mechanical
| Cab | Open operator station. Two-post fixed ROPS available. |
|---|---|
| Description | Manual steering / Mechanical wet disc brakes |
| Differential lock | mechanical rear |
| Drive type | Two- or four-wheel drive |
Hydraulics
| Pump flow | 3.17 gpm (12.0 lpm) |
|---|---|
| Type | open center |
Hitch
| Rear lift | 300 lbs (136 kg) |
|---|---|
| Rear Type | I |
PTO
| Front PTO Type | 3000 |
|---|---|
| Rear PTO | transmission |
| Rear PTO Type | 540/1000 |
Electrical
| Battery AH | 35 |
|---|---|
| Battery volts | 12 |
| Ground | negative |
Dimensions & Tires
| 2WD Clearance (rear axle) | 10.25 inches (26 cm) |
|---|---|
| 2WD Front tread | 26 inches (66 cm) |
| 2WD Weight | 805 lbs (365 kg) |
| 4WD Clearance (front axle) | 8.625 inches (21 cm) |
| 4WD Front tread | 26.4 inches (67 cm) |
| 4WD Weight | 893 lbs (405 kg) |
| Height (steering wheel) | 44.1 inches (112 cm) |
| Length | 71.6 inches (181 cm) |
| Rear tread | 25/29 inches (63/73 cm) |
| Wheelbase | 46.5 inches (118 cm) |
| Width | 36.25 inches (92 cm) |
| Front tire | 4.00-9 |
| Rear tire | 7.00-16 |
| Weight | 805 to 893 pounds |
| Wheelbase | 46.5 inches (118 cm) |
| Ag front | 4.00-9 (2WD) |
| Ag rear | 7.00-16 |
| Lawn/turf front | 18x6.50-8 |
| Lawn/turf rear | 27x8.50-15 |
References
| Description | Diesel B B5100/B6100/B7100 published in 1982, by Kubota / Tractors and Excavators published in 1981, by Kubota / Tractors and Excavators published in 1982, by Kubota |
|---|
Variants
| B5100DT | 4WD |
|---|---|
| B5100E | 2WD |