Kubota b7100

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
ManufacturerKubota
TypeCompact Utility Tractor
Made inBuilt in Japan
NoteThe Kubota B7100 was not available in the late 1980s; after that, only the hydrostatic variant was available.
Variants
B7100E2WD gear
B7100D4WD gear
B7100HSTHydrostatic
Production Years1976 – 1985
Engine Specs
Engine ModelKubota D750
Engine TypeVertical, water-cooled, 4-cycle diesel engine
Maximum Output16.0 hp (12.0 kW)
Maximum Torque50 Nm
Rated Engine Speed2800 rpm
Rated Torque Speed1800 rpm
Fuel Tank Capacity3.4 gallons (12.9 liters)
Number of Cylinders3
Displacement46.6 cubic inches (0.8 liters)
Bore/Stroke2.63/2.75 inches (67/70 mm)
Compression Ratio22:1
Direction of RotationCounterclockwise, viewed from flywheel
Combustion ChamberSpherical combustion chamber type
Fuel Injection Pump TypeBosch Type К Mini Pump (NP-PFR3KD50/2NP4)
Fuel Injection Nozzle TypeThrottle Type
Injection Pressure13.7 to 14.7 MPa
Fuel TypeDiesel fuel No. 2-D
Fuel Supply Pump Normal Operating Pressure20 kPa
CoolingWith pressurized radiator
LubricationForced lubrication by trochoid pump and full-flow micronic oil filter with bypass valve
Oil Capacity3.3 quarts (3.1 liters)
Coolant Capacity4.9 quarts (4.6 liters)
Electrical System
Starting SystemElectric starter with glow plug, compression release
Electrical Rating12 Volts
Battery ModelNT80-S6L
Battery Capacity12Vx45 Ah
Maximum Output10A, 120W
PolarityNegative Grounding
Regulator TypeThyristor direct control type
Starter TypeMagnet switch
Glow Plug TypeSheathed type
Glow Plug Controller20A
Transmission
Transmission (B7100)6 Forward x 2 Reverse
Transmission TypeUnsynchronized Gear
Forward/Reverse Speeds6F / 2R
ClutchDry 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 TypeVariable displacement piston pump
Motor TypeFixed displacement piston motor
Charge Pump TypeTrochoid pump
Oil CoolerCorrugated fin type radiator
Oil Capacity14.2 quarts (13.4 liters)
Power Take Off (PTO)
PTO Horsepower13.0 hp (9.7 kW)
PTO TypeRear, Mid, and Front (Optional)
Rear PTO Size1 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 Speeds2800 rpm
Hydraulic System and Hitch
Hydraulic System TypeClosed Center
Main Hydraulic Pump TypeGear pump (GP-OB-9.6-3127C)
Standard Pump Flow3.0 gallons per minute (11.4 liters per minute)
Hydraulic System Capacity3.6 gallons (13.6 liters)
ControlSpool sliding
Full Flow Pressure10.8 to 11.8 MPa (1570 to 1710 psi)
3-Point HitchRear, Category 1
Rear Lift Capacity1036 pounds (470 kg)
Mechanical
Drive Wheels2WD/4WD
Steering WheelsFront Steer
SteeringBall screw type, Manual Steering
Steering Gear Ratio15.4:1
Differential LockFoot pedal
Brake TypeRight and left independent with dry drum
Parking BrakeHook-interlocked with main brake
Steering Gearbox Capacity0.2 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-in0 to 0.2 inches (0 to 5 mm)
Front Wheel Camber Angle0.035 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.

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