Complete specifications for the Kubota B1550HST and B1750HST hydrostatic compact tractors, transcribed from the specifications pages of the factory operator's manual (code 66417-6291-4). Each model came as an E version (two-wheel drive) and a D version (four-wheel drive): the B1550HSE and B1550HSD use Kubota's three-cylinder D850 diesel, rated by Kubota at 17 gross horsepower, and the B1750HSE and B1750HSD use the larger D950, rated at 20 gross horsepower. Both have a hydrostatic main transmission with a two-range High-Low gear shift, a two-speed rear PTO and a mid PTO. Kubota built the B1550 from 1988 to 1997 and the B1750 from 1988 to 1996. The manual lists seven tire combinations for the B1550 and eight for the B1750, and they are reproduced here in full along with the travel speeds and Kubota's implement limits.
Power
| Specification | B1550HSE & B1550HSD | B1750HSE & B1750HSD |
|---|---|---|
| Engine Gross Power | 12.7 kW (17 HP)1 | 14.9 kW (20 HP)1 |
| PTO Power | 9.7 kW (13 HP)1 | 11.6 kW (15.5 HP)1 |
Engine
| Specification | B1550HST | B1750HST |
|---|---|---|
| Model | Kubota D850-5B | Kubota D950-5B |
| Type | Vertical, water-cooled, 4-cycle diesel — both models | |
| Number of Cylinders | 3 — both models | |
| Bore and Stroke | 72 mm × 70 mm (2.8 in. × 2.7 in.) | 75 mm × 70 mm (3.0 in. × 2.8 in.) |
| Total Displacement | 855 cm³ (52.2 cu. in.) | 927 cm³ (56.6 cu. in.) |
| Rated Revolution | 43.3 r/s (2600 rpm) — both models | |
| Fuel | Diesel fuel No. 2-D [No. 1 diesel fuel if temperature is below −10°C (14°F)] — both models | |
| Starter | Electric starter with battery, glow plug and decompression device, 12V, 0.8 kW — both models | |
| Lubrication | Forced lubrication by trochoidal pump — both models | |
| Cooling | Water with pressurized radiator — both models | |
| Battery | 12V (45 AH) — both models | |
Capacities
| Specification | B1550HSE (2WD) | B1550HSD (4WD) | B1750HSE (2WD) | B1750HSD (4WD) |
|---|---|---|---|---|
| Fuel Tank | 18 L (4.8 U.S. gals.) — all four versions | |||
| Engine Crankcase | 3.1 L (3.3 U.S. qts.) — all four versions | |||
| Engine Coolant | 2.9 L (3.1 U.S. qts.) | 2.9 L (3.1 U.S. qts.) | 3.5 L (3.7 U.S. qts.) | 3.5 L (3.7 U.S. qts.) |
| Transmission Case | 13.5 L (14.3 U.S. qts.) — all four versions | |||
| Steering Gear Box | 0.2 L (0.2 U.S. qt.) — all four versions | |||
| Front Axle Differential Case | — | 0.5 L (0.5 U.S. qt.); Bi-speed Turn: 2.5 L (2.6 U.S. qts.)2 | — | 1.5 L (1.6 U.S. qts.); Bi-speed Turn: 2.5 L (2.6 U.S. qts.)2 |
| Front Axle Gear Case | — | 0.15 L (0.15 U.S. qt.)2 | — | 0.5 L (0.5 U.S. qt.) |
Drivetrain
| Specification | B1550HSE (2WD) | B1550HSD (4WD) | B1750HSE (2WD) | B1750HSD (4WD) |
|---|---|---|---|---|
| Transmission | Main hydrostatic transmission, High-Low gear shift (2 forward, 2 reverse) — all four versions | |||
| Clutch | Dry single plate — all four versions | |||
| PTO Shaft | Transmission case rear (rear PTO), transmission case bottom (mid PTO) and engine front (front PTO) — all four versions | |||
| Rear PTO | SAE 1-3/8; 2 speeds, 540 and 858 rpm at 2517 engine rpm (9.0 and 14.3 r/s at 41.9 engine r/s) — all four versions | |||
| Mid PTO | USA No. 5 (Kubota 10 tooth) involute spline; 1 speed, 2455 rpm at 2517 engine rpm (40.9 r/s at 41.9 engine r/s) — all four versions | |||
| Steering | Recirculating ball type manual steering or integral type power steering (if equipped) — all four versions | |||
| Brake | Internal expanding type, right and left independent with interlocking device — all four versions | |||
| Differential | Bevel gear — all four versions | |||
| Minimum Turning Radius — With Brake | 2.10 m (6.9 ft.) | 2.40 m (7.9 ft.) | 2.10 m (6.9 ft.) | 2.10 m (6.9 ft.) |
| Minimum Turning Radius — Without Brake | 2.30 m (7.5 ft.) | 2.80 m (9.2 ft.); Bi-speed Turn: 2.10 m (6.9 ft.) | 2.30 m (7.5 ft.) | 2.55 m (8.4 ft.); Bi-speed Turn: 2.10 m (6.9 ft.) |
B1550HST Tires, Dimensions & Weight
Columns show front / rear tire sizes. Millimetres with inches in brackets, as printed. Where a cell lists more than one figure, the manual gives several settings for that tire.
| Dimension | 2WD Farm 4.50-10 / 7-16 |
2WD Farm 5.00-10 / 8-16 |
2WD Turf 18 × 9.50-8 / 29 × 12.00-15 |
2WD Turf 18 × 9.50-8 / 31 × 13.5-153 |
4WD Farm 6-12B / 8-16 |
4WD Turf 20.5 × 8.00-10 / 29 × 12.00-15 |
4WD Turf 20.5 × 8.00-10 / 31 × 13.5-153 |
|---|---|---|---|---|---|---|---|
| Overall Length | 2565 (101.0) — all versions | ||||||
| Overall Width | 910 (35.8), 960 (37.8) or 1080 (42.5) | 990 (39.0) or 1110 (43.7) | 1140 (44.9) | 1240 (48.8) | 980 (38.6) or 1110 (43.7) | 1140 (44.9) | 1240 (48.8) |
| Overall Height with ROPS | 1875 (73.7) | 1900 (74.8) | 1880 (74.1) | 1890 (74.4) | 1900 (74.8) | 1880 (74.1) | 1890 (74.4) |
| Wheelbase | 1470 (57.9) — all versions | ||||||
| Minimum Ground Clearance | 230 (9.1) | 255 (10.0) | 240 (9.4) | 250 (9.8) | 240 (9.4) | 215 (8.5) | 215 (8.5) |
| Front Tread | 710 (28.0) | 710 (28.0) | 850 (33.5) | 850 (33.5) | 795 (31.3) | 825 (32.5) | 895 (35.2) |
| Rear Tread | 790 (31.1) or 910 (35.8) | 790 (31.1) or 910 (35.8) | 840 (33.1) | 895 (35.2) | 790 (31.1) or 910 (35.8) | 840 (33.1) | 895 (35.2) |
| Weight with ROPS, kg (lbs.) | 560 (1235) | 570 (1257) | 580 (1279) | 570 (1257) | 625 (1378) | 630 (1389) | 630 (1389) |
B1750HST Tires, Dimensions & Weight
Columns show front / rear tire sizes. Millimetres with inches in brackets, as printed. Where a cell lists more than one figure, the manual gives several settings for that tire.
| Dimension | 2WD Farm 5.00-10 / 8-16 |
2WD Farm 5.00-10 / 9.5-16 |
2WD Turf 18 × 9.50-8 / 29 × 12.00-15 |
2WD Turf 18 × 9.50-8 / 31 × 13.5-153 |
4WD Farm 6-12B / 8-16 |
4WD Farm 6-12 / 9.5-16 |
4WD Turf 20.5 × 8.00-10 / 29 × 12.00-15 |
4WD Turf 20.5 × 8.00-10 / 31 × 13.5-153 |
|---|---|---|---|---|---|---|---|---|
| Overall Length | 2565 (101.0) — all versions | |||||||
| Overall Width | 990 (39.0) or 1110 (43.7) | 1045 (41.1), 1095 (43.1), 1145 (45.1) or 1265 (49.8) | 1140 (44.9) | 1240 (48.8) | 1050 (41.3) or 1110 (43.7) | 1045 (41.1), 1095 (43.1), 1145 (45.1) or 1265 (49.8) | 1140 (44.9) | 1240 (48.8) |
| Overall Height with ROPS | 1900 (74.8) | 1925 (75.8) | 1880 (74.1) | 1890 (74.4) | 1900 (74.8) | 1925 (75.8) | 1880 (74.1) | 1890 (74.4) |
| Wheelbase | 1470 (57.9) — all versions | |||||||
| Minimum Ground Clearance | 255 (10.0) | 285 (11.2) | 240 (9.4) | 250 (9.8) | 240 (9.4) | 255 (10.0) | 215 (8.5) | 215 (8.5) |
| Front Tread | 710 (28.0) | 710 (28.0) | 850 (33.5) | 850 (33.5) | 860 (33.9) | 860 (33.9) | 895 (35.2) | 895 (35.2) |
| Rear Tread | 790 (31.1) or 910 (35.8) | 795 (31.3), 845 (33.3), 895 (35.2) or 1015 (40.0) | 840 (33.1) | 895 (35.2) | 790 (31.1) or 910 (35.8) | 795 (31.3), 845 (33.3), 895 (35.2) or 1015 (40.0) | 840 (33.1) | 895 (35.2) |
| Weight with ROPS, kg (lbs.) | 575 (1268) | 585 (1290) | 580 (1279) | 585 (1290) | 635 (1400) | 645 (1422) | 640 (1411) | 645 (1422) |
Traveling Speeds
Speeds by High-Low range as printed, km/h with mph in brackets, at 43.3 engine r/s (2600 engine rpm), by rear tire size.
B1550HST
| Range | 7-16 | 8-16 | 29 × 12.00-15 | 31 × 13.5-15 |
|---|---|---|---|---|
| Forward | ||||
| Low (L) | 4.64 (2.88) | 4.96 (3.08) | 4.74 (2.95) | 4.87 (3.03) |
| High (H) | 11.85 (7.36) | 12.65 (7.86) | 12.12 (7.53) | 12.44 (7.73) |
| Reverse | ||||
| Low (L) | 3.48 (2.16) | 3.71 (2.31) | 3.56 (2.21) | 3.65 (2.27) |
| High (H) | 8.89 (5.52) | 9.49 (5.90) | 9.09 (3.37)4 | 9.33 (5.80) |
B1750HST
| Range | 8-16 | 9.5-16 | 29 × 12.00-15 | 31 × 13.5-15 |
|---|---|---|---|---|
| Forward | ||||
| Low (L) | 4.96 (3.08) | 5.30 (3.29) | 4.74 (2.95) | 4.87 (3.03) |
| High (H) | 12.65 (7.86) | 13.53 (8.41) | 12.12 (7.53) | 12.44 (7.73) |
| Reverse | ||||
| Low (L) | 3.71 (2.31) | 3.97 (2.47) | 3.56 (2.21) | 3.65 (2.27) |
| High (H) | 9.49 (5.90) | 10.15 (6.31) | 9.09 (3.37)4 | 9.33 (5.80) |
Implement Limitations
Kubota tested the B1550HST and B1750HST with implements it sold or approved, and warns that implements exceeding these limits may cause malfunctions or failures not covered by the warranty.
| Operating Condition | General control operation (flat ground and slope condition) |
|---|---|
| Lower Link End Max. Loading Weight (W0) | Below 180 kg (400 lbs.) |
| Implement Weight (W1) | As in the implement list below |
| Trailer Loading Weight (W2, without trailer weight) | Below 500 kg (1100 lbs.) without brake; below 1000 kg (2200 lbs.) with brake |
| Implement | B1550HST | B1750HST |
|---|---|---|
| Rotary Mower, Rear (1 Blade) | Max. cutting width 107 cm (42 in.); max. weight 140 kg (300 lbs.) — both models | |
| Rotary Mower, Mid or Rear (2 to 3 Blade) | Max. cutting width 152 cm (60 in.); max. weight 140 kg (300 lbs.) — both models | |
| Sickle Bar | Max. cutting width 122 cm (48 in.) — both models | |
| Rotary Tiller | Max. tilling width 107 cm (42 in.); max. weight 170 kg (380 lbs.) | Max. tilling width 107 cm (42 in.); max. weight 180 kg (400 lbs.) |
| Bottom Plow | 30 cm (12 in.) × 1 | 36 cm (14 in.) × 1 |
| Disc Plow | 56 cm (22 in.) × 1 — both models | |
| Cultivator | 122 cm (48 in.), 1 row — both models | |
| Disc Harrow | Max. harrowing width 122 cm (48 in.); max. weight 90 kg (200 lbs.) | Max. harrowing width 137 cm (54 in.); max. weight 140 kg (300 lbs.) |
| Sprayer | Max. tank capacity 110 L (30 gals.) — both models | |
| Front Blade | Max. cutting width 122 cm (48 in.); sub frame necessary; relief valve oil pressure 11.4 MPa (116 kgf/cm², 1650 psi) — both models | |
| Rear Blade | Max. cutting width 152 cm (60 in.); max. weight 140 kg (360 lbs.)5 | Max. cutting width 152 cm (60 in.); max. weight 160 kg (350 lbs.) |
| Front Loader | Max. lifting capacity 270 kg (600 lbs.); max. width 107 cm (42 in.); sub frame necessary — both models | |
| Box Blade | Max. cutting width 107 cm (42 in.); max. weight 170 kg (380 lbs.) — both models | |
| Backhoe (use maximum rear wheel tread width) | Max. digging depth 183 cm (72 in.); max. weight 270 kg (600 lbs.); sub frame necessary — both models | |
| Snow Blower | Max. working width 107 cm (42 in.); max. weight 160 kg (350 lbs.); sub frame necessary | Max. working width 122 cm (48 in.); max. weight 160 kg (350 lbs.); sub frame necessary |
| Trailer | Max. load capacity 500 kg (1100 lbs.) — both models | |
| Three-Point Lift | Max. load capacity 180 kg (400 lbs.) — both models | |
Notes:
1 Marked in the manual as the manufacturer's estimate.
2 As printed. The B1550HSD front axle figures (0.5 L differential case, 0.15 L gear cases) are smaller than the B1750HSD's (1.5 L and 0.5 L), while the Bi-speed Turn axle is 2.5 L on both. TODO: confirm against the tractor's front axle before filling.
3 Marked in the manual as a bar tire (if equipped).
4 As printed in both speed tables. 9.09 km/h converts to 5.65 mph, so "3.37 mph" is almost certainly a misprint.
5 As printed. 140 kg converts to about 309 lbs., so either the kilogram or the pound figure is a misprint.
All specifications transcribed from the specifications and implement limitations pages of the Kubota B1550HST and B1750HST operator's manual, code 66417-6291-4, originally published by Kubota. Production years are from TractorData, not from the manual. Kubota states that specifications and design are subject to change without notice; verify against your tractor's serial number before ordering parts or setting clearances.
Need the complete Kubota B1550HST and B1750HST operator's manual?
Get the full 60-page manual as an instant PDF download: safe operation, HST and speed set controls, three-point hitch, wheels and ballast, maintenance check list, adjustments, troubleshooting, wiring diagrams, and the specifications reproduced above.