The Kubota B7100HST is a compact utility tractor, manufactured by Kubota since 1977 to 1984. The B7100HST tractor is equipped with Kubota D750-AH diesel engine with 0.8 L (750 cc, 46.5 cu-in) of displacement and hydrostatic transmission with infinite 2-range forward and 2-range reverse gears.
The Kubota B7100 HST utility tractor used a three-cylinder liquid-cooled diesel engine Kubota D750-AH with 762 cc (46.5 cu-in) of displacement. This motor 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 and 43.1 Nm (4.4 kg·m; 31.81 lbf·ft) at 1,800 rpm of torque.
The Kubota B7100 HST is equipped with a hydrostatic transmission. This transmission has 2-range forward (5.6-14.5 km/h, 3.5-9.0 mph) and 2-range reverse gears (3.9-10.0 km/h, 2.4-6.2 mph).
The Kubota B7100 hydro is avalible in two versions:
- Kubota B7100HST-E – two-wheel variant 4×2 2WD
- Kubota B7100HST-D – four-wheel variant 4×4 MFWD 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 HST has an open operator station.
General specifications
| General Specifications | |
| Model | Kubota B7100 HST |
| Tractor type | Сompact utility tractor |
| Production years | 1977-1984 |
| Manufacturer | Kubota |
| Factory | Japan |
| Dimensions and weight | |
| Length | 2,120 mm (83.8 in.) |
| Width | 1,010 mm (40.1 in.) |
| Height (steering wheel) | 2WD: 1,170 mm (46.1 in.) 4WD: 1,180 mm (46.7 in.) |
| Wheelbase | 2WD: 1,380 mm (54.7 in.) 4WD: 1,390 mm (55.1 in.) |
| Ground clearance | 2WD: 250 mm (10.2 in.) 4WD: 240 mm (9.5 in.) |
| Front tread | 2WD: 690 mm (27.4 in.) 4WD: 850 mm (33.5 in.) |
| Weight | 2WD: 522 kg (1,151 lb.) 4WD: 573 kg (1,265 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 | 1.5 liters (1.6 US.qts, 1.3 Imp. qts) |
| Front axle gear case | 0.5 liters (0.5 US.qts, 0.45 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) |
Engine
| Engine | |
| Engine model | Kubota D750-AH |
| 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 | 43.1 Nm (4.4 kg·m; 31.81 lbf·ft) at 1,800 rpm |
| 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) |
Transmission and chassis
| Transmission and chassis | |
| Chassis | B7100HST-E: 4×2 2WD B7100HST-D: 4×4 MFWD 4WD |
| Steering | Manual type |
| Differential lock | Mechanical rear |
| Brakes | Differential mechanical expanding shoe |
| Transmission type | Hydrostatic |
| Gears | 2 forward and 2 reverse |
| Ground speed | Forward: 5.6-14.5 km/h, (3.5-9.0 mph) Reverse: 3.9-10.0 km/h, (2.4-6.2 mph) |
Tires
| Tires size | |
| Front tires | Standard: 6.9-9 (2WD), 6-12 (4WD) Lawn and turf: 20.5×8.0-10 |
| Rear tires | Standard: 8.3-16 Lawn and turf: 29×12.0-15 |
PTO and 3-point linkage
| PTO (Power take-off shaft) | |
| PTO Type: | Rear, transmission |
| PTO Speed: | Rear: 540 / 750 / 1,000 rpm Rear: 2,500 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
| Hydraulic system | |
| Type: | Closed center |
| Hydraulic luid capacity: | 13.6 L (3.6 gal.) |
| Hydraulic flow: | 11.4 lpm (3.0 gpm) |
Attachments
| Kubota RC60-71: 60″ mid-mount mower deck with 3-blade and hydraulic lift | |
| Cutting width: | 1,520 mm (60.0 in) |
| 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 B1630C Loader | |
| Height (at pin) | 1,710 mm (67.7 in) |
| Lift (full at pin) | 231 kg (510 lbs) |
| Breakout | 353 kg (780 lbs) |
| Dump angle | 46° |
| Rollback angle (ground line) | 28° |
| Dump reach | 510 mm (20.25 in) |
| Ground reach | 1,220 mm (48.3 in) |
| Dump clearance | 1,300 mm (51.5 in) |
| Bucket width | 1,210 mm (48 in) |
Serial numbers
| Serial numbers (Location on clutch housing, left side) | |
| 1980 | 10001 |
| 1981 | 11035 |
| 1982 | 13305 |
| 1983 | 51426 |
| 1984 | 53433 |
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