The Kubota B7100 is a compact utility tractor, manufactured by Kubota since 1976 to 1985. The B7100 tractor is equipped with Kubota D750-A diesel engine with 0.8 L (46.5 cu-in) of displacement and unsynchronized gear transmission with 6 forward and 2 reverse gears.
The B7100 utility tractor used a three-cylinder liquid-cooled diesel engine Kubota D750-A with 762 cc (46.5 cu-in) of displacement. It has 68.0 mm (2.68 in) of the cylinder bore and 70.0 mm (2.76 in) of the piston stroke. Compression ratio rating is 22.0:1. The engine produced 16.2 PS (11.9 KW; 16.0 HP) at 2,800 rpm of horsepower. The oil capacity is 3.9 liters (4.1 US.qts, 3.4 Imp. qts), and the coolant capacity is 4.6 liters (4.9 US.qts, 4.0 Imp. qts). The fuel tank has a capacity of 12.9 liters (3.4 US gal, 2.8 Imp. gal), and the battery is 12V 45Ah.
The Kubota B7100 is equipped with unsynchronized gear transmission with dry plate clutch. The transmission has 6 forward (1.0-13.4 km/h, 0.6-8.3 mph) and 2 reverse (1.5-6.7 km/h, 0.9-4.2 mph) gears.
The Kubota B7100 is avalible in two versions:
- Kubota B7100E – two-wheel variant 4×2 2WD
- Kubota B7100D – four-wheel variant 4×4 4WD
The tractor used manual steering, brakes with a differential mechanical expanding shoe, open center hydraulic system and foot pedal operated the differential lock. The B7100 has open operator station.
The front tires come in the size 6-12 for the standard options and 20.5×8.0-10 for lawn and turf while the rear tires come in the size 8-16 for standard options and 29×12.0-15 for lawn and turf tires.
The Kubota B7100 avalible attachments:
- Front-mount Kubota B222 1,210 mm (48.0 in) two-stage snowblower
- Front-mount Kubota B748 1,210 mm (48.0 in) front-mount two-stage snowblower
- Kubota B1630 loader
- Kubota B219 loader
General Specifications
The Kubota B7100 tractor is a compact machine that measures 2,000 mm (78.7 in) in length, 1,010 mm (40.0 in) in width, and 1,150 mm (45.5 in) in height. Engineered for tight spaces, the B7100 features a compact footprint with a total length of 2,000 mm and a manageable curb weight of 489 kg. This lightweight design ensures minimal soil compaction while maintaining stability through its 1,250 mm wheelbase. This tractor can be used as a front loader, lawnmower or snowblower.
| General Specifications | |
| Model | Kubota B7100 |
| Tractor type | Сompact utility tractor |
| Production years | 1990-1995 |
| Manufacturer | Kubota |
| Factory | Japan |
| Dimensions and weight | |
| Length | 2,000 mm (78.7 in) |
| Width | 1,010 mm (40.0 in) |
| Height | 1,150 mm (45.5 in) |
| Wheelbase | 1,250 mm (49.5 in) |
| Weight | 489 kg (1,080 lb) |
| Fluid capacity | |
| Fuel tank capacity | 12.9 liters (3.4 US gal, 2.8 Imp. gal) |
| Oil capacity | 3.9 liters (4.1 US.qts, 3.4 Imp. qts) |
| Coolant capacity | 4.6 liters (4.9 US.qts, 4.0 Imp. qts) |
| Front axle differential case | 0.7 liters (0.74 US.qts, 0.62 Imp. qts) |
| Front axle gear case | 0.15 liters (0.16 US.qts, 0.13 Imp. qts) |
| Hydraulic luid capacity: | 13.6 liters (3.6 US gal, 3 Imp. gal) |
| Electrical system | |
| Ground | Negative |
| Battery | 12V 45Ah |
| Cabin type | |
| Cabin type |
Standard: Open operator station Optional: Two-post fixed ROPS (Rollover protection structure) |
Proper lubrication and cooling are critical for this model. The system requires 3.9 liters of engine oil and a 13.6-liter hydraulic reservoir. For 4WD models, specific attention must be paid to the front axle differential and gear cases.
Engine
At the heart of the B7100 is the 3-cylinder, liquid-cooled D750-A diesel engine. This indirect-injection power unit delivers a gross output of 16.0 HP at 2,800 rpm, utilizing a Bosch K Type mini pump for precise fuel delivery.
| Engine | |
| Engine model | Kubota D750-A |
| Engine type | 4-stroke, vertical, three-cylinders |
| Displacement | 742 cm3, (45.3 cu·in) |
| Cylinder bore: | 68.0 mm (2.68 in) |
| Piston stroke: | 70.0 mm (2.76 in) |
| Compression ratio: | 22.0:1 |
| Max. horsepower |
Gross: 16.2 PS (11.9 KW; 16.0 HP) at 2,800 rpm At PTO-shaft: 13.2 PS (9.7 KW; 13.0 HP) at 2,800 rpm |
| Max. torque | – |
| Cooling system | Liquid-cooled |
| Lubricating system | Forced lubrication by pump |
| Combustion chamber | Spherical type |
| Fuel injection pump | Bosch K Type Mini Pump |
| Injection type | Indirect injection |
| Injection nozzle | Bosch throttle type |
| Firing order | 1-2-3 |
| Fuel used | Diesel fuel No.2-D |
| Starting system | Electric starter (12V, 0.8 kW) |
| Starting support device | Glow plug in combustion chamber |
| Governor | Centrifugal ball mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Cylinder compression pressure | |
| Cylinder compression: | 31.5 kgf/cm2 (3.09 MPa, 448 psi) |
| Compression differential limit between cylinders: | 10% or less |
| Valve clearance | |
| Intake valve clearance: | 0.150-0.200 mm (0.006-0.008 in) |
| Exhaust valve clearance: | 0.150-0.200 mm (0.006-0.008 in) |
| Oil system | |
| Lubrication system: | Forced lubrication by pump |
| Oil type: | API CC or better |
| Oil capacity: | 3.9 liters (4.1 US.qts, 3.4 Imp. qts) |
| Oil filter: | Full flow paper filter (cartridge type) |
| Oil pressure: |
At idle spped: 68 kPa (0.7 kgf/cm2, 10 psi) At rated speed: 196-441 kPa (2.0-4.5 kgf/cm2, 29-64 psi) |
| Fuel system | |
| Fuel injection pump | Bosch K Type Mini Pump |
| Injection nozzle | Bosch throttle Type |
| Injection timing: | 25° B.T.D.C. |
| Fuel injection pressure | 13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi) |
| Cooling system | |
| Type: | Pressurized radiator, forced circulation with water pump |
| Thermostat’s valve opening temperature: | 80.5-83.5°C (176.9-182.3°F) |
| Temperature at which thermostat completely opens: | 95°C (203°F) |
| Coolant capacity | 4.6 liters (4.9 US.qts, 4.0 Imp. qts) |
| Cylinder block | |
| Number of piston rings (compression / oil): | 2 / 1 |
| Cylinder inner diameter: | 68.000-68.019 mm (2.6772-2.6779 in) |
| Piston skirt to cylinder clearance | 0.076-0.102 mm (0.003-0.004 in) |
| Piston ring side clearance (Second): | 0.085-0.112 mm (0.0033-0.0044 in) |
| Piston ring side clearance (Oil): | 0.020-0.055 mm (0.0008-0.0022 in) |
| Piston ring end gap (Top): | 0.250-0.400 mm (0.0098-0.0157 in) |
| Piston ring end gap (Second): | 0.250-0.400 mm (0.0098-0.0157 in) |
| Piston ring end gap (Oil): | 0.200-0.400 mm (0.0079-0.0157 in) |
| Piston pin outer diameter | 20.002-20.011 mm (0.7875-0.7878 in) |
| Crankshaft main journal diameter: | 43.934-43.950 mm (1.7297-1.7303 in) |
| Crankshaft main journal bearing clearance: | 0.034-0.106 mm (0.0013-0.0042 in) |
| Crankshaft crankpin diameter: | 36.959-36.975 mm (1.4551-1.4557 in) |
| Crankshaft crankpin bearing clearance: | 0.029-0.087 mm (0.0011-0.0034 in) |
| Crankshaft crankpin side clearance: | 0.200-0.400 mm (0.008-0.016 in) |
| Crankshaft end play: | 0.150-0.300 mm (0.006-0.012 in) |
| Piston pin diameter: | 20.002-20.011 mm (0.7875-0.7878 in) |
| Piston pin clearance: | 0.015-0.040 mm (0.0006-0.0015 in) |
| Cylinder head | |
| Valves: | 6 (2 valves per cylinder) |
| Valve seat width (INTAKE): | 2.120 mm (0.0835 in) |
| Valve seat width (EXHAUST): | 2.120 mm (0.0835 in) |
| Valve face angle: | 45° |
| Valve seat angle: | 2.120 mm (0.0835 in) |
| Valve stem diameter (INTAKE): | 6.960-6.975 mm (0.274-0.2746 in) |
| Valve stem diameter (EXHAUST): | 6.960-6.975 mm (0.274-0.2746 in) |
| Valve spring free length (INTAKE): | 35.100-34.800 mm (1.3819-1.3701 in) |
| Valve spring free length (EXHAUST): | 35.100-34.800 mm (1.3819-1.3701 in) |
| Camshaft journal diameter: | 32.934-32.950 mm (1.2966-1.2972 in) |
| Camshaft journal bearing clearance: | 0.050-0.091 mm (0.0020-0.0036 in) |
To maintain peak performance, the D750-A requires a valve clearance of 0.150-0.200 mm for both intake and exhaust. The forced lubrication system operates at a rated pressure of up to 441 kPa, protected by a full-flow paper cartridge filter.
Transmission and chassis
The B7100 utilizes an unsynchronized gear transmission offering 6 forward and 2 reverse speeds. Available in both 2WD (E-model) and 4WD (D-model) configurations, it features mechanical wet disc brakes and a rear differential lock for enhanced traction.
| Transmission and chassis | |
| Chassis |
B7100E: 4×2 2WD B7100D: 4×4 4WD |
| Steering | Manual type |
| Brakes | Mechanical wet disc brakes |
| Differential lock | Mechanical rear |
| Front axle differential case | 0.7 liters (0.74 US.qts, 0.62 Imp. qts) |
| Front axle gear case | 0.15 liters (0.16 US.qts, 0.13 Imp. qts) |
| Transmission type | Unsynchronized gear with dry plate type clutch |
| Gears | 6 forward and 2 reverse |
| Ground speed | Forward: 1st: 1.0 km/h, (0.62 mph) – rotary tilling, levelling, ridging 2nd: 1.71 km/h, (1.06 mph) – rotary tilling, levelling 3rd: 2.93 km/h, (1.82 mph) – rotary furrowing, pudding 4th: 4.6 km/h, (2.85 mph) – pudding, plowing 5th: 7.83 km/h, (4.85 mph) – plowing 6th: 13.4 km/h, (8.32 mph) – trailing work, road travelling Reverse: R1: 1.47 km/h, (0.91 mph) R2: 6.73 km/h, (4.20 mph) |
Tires
| Tires size | |
| Front tires |
Standard: 6-12 Lawn and turf: 20.5×8.0-10 |
| Rear tires |
Standard: 8-16 Lawn and turf: 29×12.0-15 |
| Nornal tire pressure | |
| Front tires | 0.10 MPa (1.0 kgf/cm2, 14 psi) |
| Rear tires | 0.12 MPa (1.2 kgf/cm2, 18 psi) |
PTO and 3-point linkage
Equipped with a Category I 3-point hitch, the tractor has a lifting capacity of 181 kg. The transmission-driven rear PTO offers three distinct speeds (540/750/1,000 rpm), allowing compatibility with a wide range of agricultural implements.
| PTO (Power take-off shaft) | |
| PTO Type: | Rear, transmission |
| PTO Speed: |
Rear: 540 / 750 / 1,000 rpm Front: 2,800 rpm |
| Hydraulic lift | |
| 3-point linkage: | Category I |
| Control system: | – |
| No. of remote valves: | – |
| Max lifting capacity (at link end): | 181 kg (400 lb) |
Hydraulic system
The closed-center hydraulic system provides a steady flow of 11.4 lpm (3.0 gpm). With a total fluid capacity of 13.6 liters, the system ensures responsive control for the 3-point linkage and optional front-mounted attachments.
| Hydraulic system | |
| Type: | Closed center |
| Hydraulic fluid capacity: | 13.6 liters (3.6 US gal, 3 Imp. gal) |
| Hydraulic flow: | 11.4 lpm (3.0 gpm) |
Attachments
| Kubota B2030: 48″ front-mount blade with hydraulic-lift and manual or hydraulic angle (optional) | |
| Width: | 1,210 mm (48.0 in) |
| Height: | 440 mm (17.5 in) |
| Lift: | 240 mm (9.8 in) |
| Angling: | 30° |
| Kubota B222: 48″ front-mount two-stage snow blower | |
| Cleaning width: | 1,210 mm (48.0 in) |
| Cleaning height: | 580 mm (23.0 in) |
| Kubota B748: 48″ front-mount two-stage snow blower | |
| Cleaning width: | 1,210 mm (48 in) |
| Kubota B1630 Loader | |
| Height (at pin) | 1,750 mm (69.2 in) |
| Lift (full at pin) | 263 kg (580 lbs) |
| Breakout | 430 kg (950 lbs) |
| Dump angle | 39° |
| Rollback angle (ground line) | 20° |
| Dump reach | 530 mm (20.9 in) |
| Ground reach | 1,190 mm (46.9 in) |
| Dump clearance | 1,370 mm (54.1 in) |
| Bucket width |
1,060 mm (42 in) 1,210 mm (48 in) 1,370 mm (54 in) |
| Kubota B219 Loader | |
| Height (at pin) | 1,860 mm (73.5 in) |
| Lift (full at pin) | 226 kg (500 lbs) |
| Dump angle | 39° |
| Dump reach | 550 mm (22.0 in) |
| Dump clearance | 1,410 mm (55.75 in) |
| Bucket width |
960 mm (38.0 in) 1,210 mm (48.0 in) |
Serial numbers
| Serial numbers (Location on clutch housing, left side) | |
| 1976 | 10001 | 1977 | 13931 | 1978 | 36646 | 1979 | 54221 | 1980 | 64448 | 1981 | 70678 | 1982 | 74217 | 1983 | 76009 | 1984 | 77309 | 1985 | 78435 |
Maintenance Parts & Consumables List
To keep your Kubota B7100 running at peak performance, use the following part specifications for regular maintenance:
- Engine Oil Filter: Full-flow paper cartridge type (Spin-on).
- Common replacements: Kubota 15853-32430, Baldwin B179, Wix 51064.
- Fuel Filter: Element type.
- Common replacements: Kubota 15221-43170, Baldwin PF933, Wix 33262.
- Air Filter: Dry element type.
- Common replacements: Kubota 15222-11220, Baldwin PA1864, Wix 42276.
- Fan Belt: V-type belt.
- Specifications: Standard industrial size (approx. 32-35 inches depending on alternator setup).
- Glow Plugs: 12V quick-heat type.
- Part number: Kubota 15221-65510 (NGK Y-103V or equivalent).
- Battery: 12V 45Ah (Group 24 or similar compact tractor size).
- Tires:
- Front (Standard): 6-12 Agricultural tread.
- Rear (Standard): 8-16 Agricultural tread.
- Turf option: 20.5×8.0-10 (Front) / 29×12.0-15 (Rear).
Recommended Lubricants
- Engine Oil: 10W-30 or 15W-40 (API Service CC, CD or higher).
- Transmission/Hydraulic Fluid: Kubota UDT or Super UDT (Universal Trans-Hydraulic Fluid).
- Front Axle (4WD): SAE 80W-90 Gear Oil.
- Chassis Grease: Multi-purpose lithium-based grease (NLGI No. 2).
I need to find pivot pin & bushings for a B7100. Can you direct me how to find he information on the tractor so I can order this part?