Factory service data for the B1550, B1550HST, B1750, B1750HST, B2150, and B2150HST sits in this 634-page Kubota shop manual PDF (OEM #97897-10226). Eighteen pages of wiring diagrams sit alongside 20 pages of hydraulic schematics and 120 pages of step-by-step disassembly covering engine, clutch, transmission, front and rear axle, steering, plus the hydrostatic supplement. Add 15 pages of torque tables, 14 pages of troubleshooting charts, and a 70-page mower supplement. Torque cylinder head screws to 64.7 to 69.6 N-m, then bring B1550 and B1750 rear wheel nuts up to 166.7 to 191.2 N-m before the tractor leaves the shop. Quit chasing wiring faults with a multimeter and a prayer. Every section is bookmarked, so tap a heading on your tablet and walk straight to the machine.
What's Inside This Kubota B1550–B2150 Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 4-10 | - |
| Mechanism | 11-145 | Features, Engine, Clutch, Transmission, Rear Axle, Brake, Front Axle, Steering |
| General Maintenance | 146-168 | Lubricants and Fluid, Tightening Torques, Maintenance Check List, Check and Maintenance Procedures |
| Separation and Assembly | 169-204 | Tightening Torques, Adjusting, B1550 and B1750 Series, B2150 Series |
| Servicing - Engine | 205-260 | Troubleshooting, Servicing Specifications, Checking, Disassembling and Servicing |
| Servicing - Clutch | 261-276 | Troubleshooting and Specifications, Checking, Disassembling and Servicing |
| Servicing - Transmission | 277-349 | Troubleshooting, Servicing Specifications, Checking, Disassembling and Servicing |
| Servicing - Rear Axle | 350-358 | Troubleshooting and Specifications, Checking, Disassembling and Servicing |
| Servicing - Brake | 359-366 | Troubleshooting and Specifications, Checking, Disassembling and Servicing |
| Servicing - Front Axle | 367-420 | Troubleshooting and Specifications, Checking, Disassembling and Servicing |
| Servicing - Steering | 421-456 | Troubleshooting, Servicing Specifications, Checking, Disassembling and Servicing |
| Servicing - Hydraulic System | 457-484 | Troubleshooting and Specifications, Checking, Disassembling and Servicing |
| Servicing - Electrical System | 485-520 | Troubleshooting and Specifications, Checking, Disassembling and Servicing |
| Supplement - New Hydrostatic Transmission | 521-549 | Mechanism, Servicing |
| Supplement - Bi-Speed Turn | 550-563 | Mechanism, Servicing |
| Supplement - Mower | 564-634 | General and Specifications, Mechanism, Servicing and Adjusting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head screws and nuts | 64.7 to 69.6 N-m | p. 217 |
| Filter mesh | 10 to 20 µm | p. 25 |
| Air pressure for cleaning | not to exceed 206 kPa (2.1 kgf/cm², 30 psi) | p. 157 |
| Nozzle holder assembly | 39.2 to 49.0 N-m | p. 217 |
| B1550, B1750, B1550HST, B1750HST | ||
| Rear wheel mounting screw and nut | 166.7 to 191.2 N-m | p. 171 |
| B1750HST | ||
| Hydraulic oil filter Setting Screw Size | M20 Pitch 1.5 mm | p. 149 |
| B1550, B1750 | ||
| Battery | 12V (45 AH) | p. 4 |
| B1550-B1750-B1550HST-B1750HST | ||
| Brush Length (Allowable Limit) | 10.5 mm | p. 490 |
| Alternator type for Canada | ||
| Brush length (Allowable limit) | 1.5 mm | p. 500 |
| B1550, B1550HST | ||
| Fuel Tank Capacity | 18 l (4.8 U.S. gals) | p. 4 |
| B2150, B2150HST | ||
| Engine Oil Capacity | 4.2 l (4.4 U.S. qts) | p. 153 |
| B1750, B1750HST | ||
| Total Displacement | 927 cm³ (56.6 cu.in.) | p. 6 |
Kubota B1550–B2150 Series Common Problems This Manual Covers
Kubota B1550 hard starting with heavy white smoke, then losing power and stalling under load
Drain stale fuel and refill with fresh diesel. Swap the fuel filter element (10 to 20 µm mesh, page 25) and bleed air at the injection pump and injectors. Crack each injector line at the nozzle, crank until clean fuel weeps, then retorque nozzle holders to 39.2 to 49.0 N·m.
Manual Section: Servicing - EngineEngine will not crank or starter clicks but does not spin over p. 487
Measure battery voltage at rest (12.6V minimum on the 12V 45AH unit) and load-test under crank. Clean both terminals and the ground strap to bare metal. Pull the starter and check brush length per page 490, replacing brushes once worn to the 10.5 mm allowable limit. Confirm the clutch-pedal safety switch closes.
Manual Section: Electrical System TroubleshootingHydrostatic transmission weak, slow to move, or creeps in neutral after warm-up
Park level and read HST fluid cold on the dipstick, then drain and refill if milky or burnt. Pull and clean the suction screen and fit a new hydraulic filter (M20 x 1.5 mm setting screw). Run at 2600 rpm and confirm pump delivery near 21 l/min (5.6 U.S. GPM) at no pressure per page 460. Trim the neutral linkage if creep continues.
Manual Section: Transmission Troubleshooting4WD lever stuck engaged or very hard to disengage, especially after loader work on the B1750
Relieve driveline wind-up: roll the tractor straight forward six feet on level ground with the lever in neutral, then try the lever. Inspect shift linkage pivots for bent rods and worn bushings, lubricate, and adjust rod length so the detent fully seats. Swap galled pivot pins before reassembly.
Manual Section: Front Axle TroubleshootingEngine overheating during mowing or loader work with coolant pushing out the overflow
Shut down and wait 30 minutes before opening the radiator cap. Blow radiator fins out from the fan side with compressed air not exceeding 206 kPa (30 psi). Set fan belt deflection at 10 mm (0.4 in.) under thumb pressure, refill coolant to the upper tank line, and confirm oil pressure at rated speed sits between 245 and 343 kPa (36 to 49 psi).
Manual Section: Engine TroubleshootingLoader rises slowly, will not reach full height, or drops under its own weight overnight p. 459
Top off hydraulic oil and fit a new filter. Inspect the control valve spool for scoring and the lift cylinder packing for external weep. Test pump delivery at 2600 rpm: under 21 l/min points to pump wear. Verify the relief valve setting and clean the suction strainer (10 to 20 µm). Replace cylinder seals if the implement drifts more than 25 mm in ten minutes.
Manual Section: Hydraulic System TroubleshootingFrequently Asked Questions
What do the flashing lights or warning lamps mean on a Kubota B1550/B1750/B2150?
Each warning lamp on the B1550 points to a specific fault, not general service. A lightning bolt means improper charging. An oil can flags low engine oil pressure, illuminating when pressure drops below roughly 49 kPa (7.1 psi). A coil symbol is the pre-heating indicator for the glow plugs.
What are the torque specs for Kubota B1550/B1750/B2150 head bolts and wheel bolts?
Torque cylinder head screws and nuts to 64.7 to 69.6 N·m (47.7 to 51.4 ft-lbs). On B1550 and B1750 models the rear wheel mounting screws run 166.7 to 191.2 N·m (123.0 to 141.0 ft-lbs); on B2150 and B2150HST they run 196 to 294 N·m (145 to 166 ft-lbs).
What is the correct procedure to bleed the fuel system on a Kubota B1550/B1750/B2150 after running out of fuel?
On B1550 and B1750 models, fill the tank and open the fuel cock. Crack the air vent plug on the injection pump. Pull the engine stop knob all the way back, then turn the key to rotate the engine for about 10 seconds. Close the vent plug once fuel flows out. B2150 models use two air vent plugs instead of one.
What are the replacement specifications for the battery?
B1550 and B1750 tractors use a 12V, 45 AH battery. The larger B2150 and B2150HST take a 12V, 65 AH battery. The manual also references a dry-charged NS70 type with 65 Ah capacity.
What format is this Kubota B1550, B2150 manual in?
A 634-page Shop Manual delivered as a searchable PDF the moment checkout completes. View on computer, tablet, or phone with no shipping wait.
Can I print specific sections of this Kubota B1550, B2150 Shop Manual?
Yes. No DRM or copy protection. Print the whole manual or just the pages you need on any home or office printer.
Are there hydraulic schematics in this Kubota B1550, B2150 manual?
Yes, the Kubota B1550, B2150 Shop Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
Document Quality
This document is a scan of a printed workshop manual, and because it's image-based, you cannot search or copy the text. The text is clear and readable, though not perfectly sharp like a native digital file. Diagrams and illustrations are also scanned; they are legible and useful but will appear pixelated when zoomed in closely. The pages are generally clean with some minor scan artifacts like specks and slight page skew, and you will find several blank or filler pages throughout the manual.
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