The Kubota B7100 is a compact utility tractor known for its versatile capabilities and reliability. It features a vertical, water-cooled, 4-cycle diesel engine designed for efficient performance. With its range of transmission options, including unsynchronized gear and hydrostatic transmission, it offers flexibility in handling various tasks. The tractor is equipped with a closed-center hydraulic system and a 3-point hitch for efficient implement attachment. Its compact size and maneuverability make it suitable for both farm and landscaping work. Additionally, the B7100 comes with options for different tire types to suit various terrains, and it offers both 2WD and 4WD configurations. Overall, the Kubota B7100 is a dependable workhorse designed to meet the needs of small to medium-sized agricultural and landscaping operations.
| Production |
|---|
| Manufacturer | Kubota |
| Type | Compact Utility Tractor |
| Made in | Built in Japan |
| Note | The Kubota B7100 was not available in the late 1980s; after that, only the hydrostatic variant was available. |
| Variants |
|---|
| B7100E | 2WD gear |
| B7100D | 4WD gear |
| B7100HST | Hydrostatic |
| Production Years | 1976 – 1985 |
| Engine Specs |
|---|
| Engine Model | Kubota D750 |
| Engine Type | Vertical, water-cooled, 4-cycle diesel engine |
| Maximum Output | 16.0 hp (12.0 kW) |
| Maximum Torque | 50 Nm |
| Rated Engine Speed | 2800 rpm |
| Rated Torque Speed | 1800 rpm |
| Fuel Tank Capacity | 3.4 gallons (12.9 liters) |
| Number of Cylinders | 3 |
| Displacement | 46.6 cubic inches (0.8 liters) |
| Bore/Stroke | 2.63/2.75 inches (67/70 mm) |
| Compression Ratio | 22:1 |
| Direction of Rotation | Counterclockwise, viewed from flywheel |
| Combustion Chamber | Spherical combustion chamber type |
| Fuel Injection Pump Type | Bosch Type К Mini Pump (NP-PFR3KD50/2NP4) |
| Fuel Injection Nozzle Type | Throttle Type |
| Injection Pressure | 13.7 to 14.7 MPa |
| Fuel Type | Diesel fuel No. 2-D |
| Fuel Supply Pump Normal Operating Pressure | 20 kPa |
| Cooling | With pressurized radiator |
| Lubrication | Forced lubrication by trochoid pump and full-flow micronic oil filter with bypass valve |
| Oil Capacity | 3.3 quarts (3.1 liters) |
| Coolant Capacity | 4.9 quarts (4.6 liters) |
| Electrical System |
|---|
| Starting System | Electric starter with glow plug, compression release |
| Electrical Rating | 12 Volts |
| Battery Model | NT80-S6L |
| Battery Capacity | 12Vx45 Ah |
| Maximum Output | 10A, 120W |
| Polarity | Negative Grounding |
| Regulator Type | Thyristor direct control type |
| Starter Type | Magnet switch |
| Glow Plug Type | Sheathed type |
| Glow Plug Controller | 20A |
| Transmission |
|---|
| Transmission (B7100) | 6 Forward x 2 Reverse |
| Transmission Type | Unsynchronized Gear |
| Forward/Reverse Speeds | 6F / 2R |
| Clutch | Dry Plate |
| Transmission (B7100HST) | Infinite (2-range) forward and reverse |
| Transmission Type (B7100HST) | Hydrostatic transmission and gear shift (high, low) |
| Clutch (B7100HST) | Dry, Single plate |
| Pump Type | Variable displacement piston pump |
| Motor Type | Fixed displacement piston motor |
| Charge Pump Type | Trochoid pump |
| Oil Cooler | Corrugated fin type radiator |
| Oil Capacity | 14.2 quarts (13.4 liters) |
| Power Take Off (PTO) |
|---|
| PTO Horsepower | 13.0 hp (9.7 kW) |
| PTO Type | Rear, Mid, and Front (Optional) |
| Rear PTO Size | 1 3/8 inches, 6 spline |
| Mid PTO Size (B7100HST) | Involute spline SAE No. 5 |
| Rear PTO Speeds (B7100) | 540/750/1000 rpm |
| Rear PTO Speeds (B7100HST) | 540/850 rpm |
| Mid PTO Speeds (B7100HST) | 2450 rpm |
| Front PTO Speeds | 2800 rpm |
| Hydraulic System and Hitch |
|---|
| Hydraulic System Type | Closed Center |
| Main Hydraulic Pump Type | Gear pump (GP-OB-9.6-3127C) |
| Standard Pump Flow | 3.0 gallons per minute (11.4 liters per minute) |
| Hydraulic System Capacity | 3.6 gallons (13.6 liters) |
| Control | Spool sliding |
| Full Flow Pressure | 10.8 to 11.8 MPa (1570 to 1710 psi) |
| 3-Point Hitch | Rear, Category 1 |
| Rear Lift Capacity | 1036 pounds (470 kg) |
| Mechanical |
|---|
| Drive Wheels | 2WD/4WD |
| Steering Wheels | Front Steer |
| Steering | Ball screw type, Manual Steering |
| Steering Gear Ratio | 15.4:1 |
| Differential Lock | Foot pedal |
| Brake Type | Right and left independent with dry drum |
| Parking Brake | Hook-interlocked with main brake |
| Steering Gearbox Capacity | 0.2 quarts (0.2 liters) |
| Front Differential Case Capacity (4WD) | 1.6 quarts (1.5 liters) |
| Front Wheel Axle Case Capacity (4WD) | 0.5 quarts (0.6 liters) |
| Wheels and Tires |
|---|
| Front Tires (Farm) | 6-12 (4WD) / 6.90-9 (2WD) |
| Rear Tires (Farm) | 8-16 |
| Front Tires (Turf) | 20.5×8.00-10 |
| Rear Tires (Turf) | 29×12.00-15 |
| Front Wheel Toe-in | 0 to 0.2 inches (0 to 5 mm) |
| Front Wheel Camber Angle | 0.035 rad (2 degrees) |
| Front Tread (2WD) | 27.2/30.5 inches (685/770 mm) |
| Rear Tread (2WD) | 28.8/30.7/32.7 inches (725/775/825 mm) |
| Front Tread (4WD) | 33.7/35.5 inches |
The Kubota B7100 stands out in the world of compact utility tractors due to several unique features and characteristics:
Kubota B7100 Advantages:
Compact Size: The B7100 is relatively small and nimble, making it suitable for work in tight spaces and on smaller properties. Its compact design allows it to navigate through narrow pathways and get into areas that larger tractors cannot access.
Versatile Transmission: This tractor offers two transmission options—unsynchronized gear and hydrostatic transmission. The hydrostatic transmission, available in the B7100HST model, provides easy and smooth control, making it user-friendly for operators of all skill levels.
Efficient Engine: Powered by a 3-cylinder Kubota D750 engine, the B7100 delivers reliable and efficient performance. The engine’s 4-cycle diesel design ensures fuel efficiency and durability, making it a cost-effective choice for various tasks.
Hydraulic System: The closed-center hydraulic system in the B7100 enables precise control of hydraulic implements. It provides consistent and reliable hydraulic power for front-end loaders, backhoes, and other attachments.
3-Point Hitch: Equipped with a Category 1, 3-point hitch, the B7100 allows for the attachment of various implements, such as mowers, plows, and tillers. This versatility makes it suitable for a wide range of tasks on the farm or in landscaping.
Different Tire Options: The availability of various tire types, including agricultural and turf tires, allows users to customize the tractor’s configuration to match specific terrain and operational requirements.
Kubota B7100 Disadvantages:
Limited Power: The B7100 has a relatively low horsepower rating compared to larger tractors, limiting its capacity for heavy-duty tasks. It may struggle with more demanding agricultural work.
Lack of Synchronization (in certain models): The unsynchronized gear transmission in some models can make gear shifts less smooth and may require more operator skill during operation.
Price: While the B7100 offers many advantages, its initial purchase price and potential costs associated with attachments and maintenance may be a consideration for budget-conscious buyers.
In summarizing, the Kubota B7100’s compact size, versatile transmission options, and dependable performance make it special and unique among compact utility tractors. Its advantages include versatility, maneuverability, and efficiency, while its disadvantages revolve around limited power for heavy-duty tasks and potential cost considerations. Overall, the B7100 is an excellent choice for small to medium-sized farms and landscaping operations looking for a reliable and adaptable tractor.
