One job, 312 pages: get the correct Kubota B1550HST-D part number on the first try. Exploded views cover the crankcase, HST, front differential (with and without Bi-Speed Turn), hydraulic gear pump, control valve, and rear axle, alongside component breakdowns for the nozzle holder, injection pump, starter, and power steering block. The parts list ties 150 numbered callouts to factory illustrations across engine, drivetrain, chassis, and hydraulics. Piston oversize runs +0.5mm, crankpin metal undersize comes as a -0.2mm set, and the hydraulic pump gear carries 27 teeth, so the right kit shows up at your door, not the close one. No more squinting at a worn parts decal hoping the digits match. Bookmarked by system: tap the section, pull the callout number, order the part. Works on phone, tablet, or laptop right next to the tractor.
What's Inside This Kubota B1550HST-D Parts Manual
| System | Pages |
|---|---|
| Crankcase | 6-7 |
| Oil Pan | 8-10 |
| Piston/Crankshaft | 11-12 |
| Main Bearing Case | 13-14 |
| Flywheel | 15-17 |
| Cylinder Head | 18-19 |
| Valve/Rocker Arm | 20-21 |
| Nozzle Holder | 22-23 |
| Nozzle Holder [Component Parts] | 24-25 |
| Cylinder Head Cover | 26-28 |
| Inlet Manifold | 29-30 |
| Exhaust Manifold | 31-32 |
| Camshaft | 33-34 |
| Gear Case | 35-36 |
| Water Pump | 37-38 |
| Tension Pulley [Ca] | 39-40 |
| Water Flange | 41-42 |
| Fuel Pump | 43-44 |
| Injection Pump | 45-46 |
| Injection Pump [Component Parts] | 47-48 |
| Engine Stop Lever | 49-50 |
| Speed Control Plate | 51-52 |
| Governor | 53-54 |
| Upper Gasket Kit | 55-56 |
| Lower Gasket Kit | 57-58 |
| Dynamo [A] [Au] [Nz] | 59-60 |
| Alternator [Ca] | 61-62 |
| Dynamo [A] [Au] [Nz] [Component Parts] | 63-64 |
| Alternator [Ca] [Component Parts] | 65-66 |
| Clutch | 67-68 |
| Hydraulic Gear Pump | 69-70 |
| Hydraulic Gear Pump [Component Parts] | 71-73 |
| Air Cleaner | 74-75 |
| Muffler | 76-77 |
| Horizontal Muffler [Option] | 78-79 |
| Engine Stop Rod | 80-82 |
| Accelerator Lever | 83-84 |
| Fuel Tank | 85-86 |
| Fuel Pipe | 87-88 |
| Fuel Filter [Component Parts] | 89-90 |
| Water Pipe | 91-93 |
| Radiator | 94-96 |
| Starter | 97-98 |
| Starter [Component Parts] | 99-100 |
| Battery | 101-103 |
| Light | 104-106 |
| Working Light [Option] | 107-108 |
| Panel/Switch [A] [Au] [Nz] | 109-111 |
| Panel/Switch [Ca] | 112-113 |
| Panel Board [Component Parts] | 114-115 |
| Wire Harness [A] [Au] [Nz] | 116-117 |
| Wire Harness [Ca] | 118-119 |
| Clutch Rod | 120-121 |
| Clutch Pedal | 122-123 |
| Clutch Housing | 124-126 |
| Transmission Case | 127-128 |
| Transmission Case Cover | 129-130 |
| HST | 131-133 |
| HST [Component Parts] | 134-139 |
| Propeller Shaft | 140-141 |
| 2Nd Shaft | 142-143 |
| 3Rd Shaft/5Th Shaft | 144-145 |
| 4Th Shaft | 146-147 |
| Front Wheel Drive Shaft | 148-149 |
| Rear PTO | 150-152 |
| Mid PTO | 153-154 |
| Front PTO [Option] | 155-156 |
| Neutral Holder | 157-159 |
| Speed Control Pedal | 160-161 |
| Speed Change Plate | 162-163 |
| Range Gear Shift Lever | 164-165 |
| PTO Gear Shift Lever | 166-167 |
| Rear Differential | 168-169 |
| Diff. Lock Pedal | 170-171 |
| Rear Axle | 172-173 |
| Rear Axle Case | 174-175 |
| Rear Wheel (8-16) | 176-178 |
| Rear Wheel (29 X 12.00-15) | 179-181 |
| Rear Wheel (31 X 13.5-15 Bar) [A] | 182-184 |
| Brake | 185-186 |
| Brake Rod | 187-188 |
| Brake Pedal | 189-190 |
| Front Wheel Hub [Without Bi-Speed Turn] | 191-192 |
| Front Wheel Hub | 193-194 |
| Front Gear Case [Without Bi-Speed Turn] | 195-196 |
| Front Gear Case | 197-198 |
| Bevel Gear Case | 199-200 |
| Front Axle Case [Without Bi-Speed Turn] | 201-202 |
| Front Axle Case [With Bi-Speed Turn] | 203-204 |
| Front Differential [Without Bi-Speed Turn] | 205-206 |
| Front Differential [With Bi-Speed Turn] | 207-208 |
| Bevel Gear [With Bi-Speed Turn] | 209-210 |
| Clutch Disk [With Bi-Speed Turn] | 211-212 |
| Front Drive Shaft | 213-215 |
| Front Drive Lever | 216-217 |
| Shift Fork [With Bi-Speed Turn] | 218-220 |
| Shift Lever [With Bi-Speed Turn] | 221-222 |
| Bi-Speed Turn Rod [With Bi-Speed Turn] | 223-224 |
| Bi-Speed Turn Lever [With Bi-Speed Turn] | 225-226 |
| Front Wheel (6-12B) | 227-228 |
| Front Wheel (20.5 X 8.00-10) | 229-230 |
| Front Axel Frame | 231-233 |
| Knuckle Arm [Without Bi-Speed Turn] | 234-235 |
| Knuckle Arm [With Bi-Speed Turn] | 236-237 |
| Manual Steering | 238-240 |
| Power Steering | 241-242 |
| Manual Steering [Component Parts] | 243-244 |
| Power Steering [Component Parts] | 245-246 |
| Hydraulic Pipe (Ps) | 247-248 |
| Hydraulic Pipe (Front) | 249-250 |
| Hydraulic Pipe (Rear) | 251-252 |
| Hydraulic Block (Ms) [Component Parts] | 253-254 |
| Hydraulic Block (Ps) [Component Parts] | 255-256 |
| Hydraulic Pipe (HST) | 257-258 |
| Oil Cooler | 259-260 |
| Lift Arm | 261-263 |
| Hyd.Cylinder Cap [Component Parts] | 264-269 |
| Control Valve | 270-271 |
| Control Valve [Component Parts] | 272-274 |
| Top Link | 275-276 |
| Lower Link | 277-278 |
| Lift Rod | 279-280 |
| Hood (Bonnet) | 281-282 |
| Lace | 283-284 |
| Hood Cover Rear | 285-286 |
| Skirt (Front) | 287-288 |
| Skirt (Side) | 289-291 |
| Dust Cover | 292-293 |
| Tank Support | 294-295 |
| Fender | 296-298 |
| Seat | 299-300 |
| Step | 301-302 |
| ROPS [A] [Ca] | 303-306 |
| Label 1 | 307-308 |
| Label 2 | 309-311 |
| Accessories and Service Parts | 312-312 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Piston Oversize | +0.5MM | p. 12 |
| Crankpin Metal Undersize | -0.2MM SET | p. 12 |
| Side Metal Oversize | +0.2MM | p. 12 |
| Nozzle Holder Adjusting Washer Thickness | 1.00MM | p. 25 |
| Hydraulic Pump Gear Tooth Count | 27T | p. 70 |
| Hydraulic Pump Shaft Gear Tooth Count | 20T | p. 70 |
| Fuse Rating | 15A | p. 117 |
| HST Gear Shaft Tooth Count | 14T | p. 133 |
| 2nd Shaft Gear Tooth Count | 14T | p. 143 |
| 3rd/5th Shaft Gear Tooth Count | 21T | p. 145 |
| 4th Shaft Gear Tooth Count | 24T | p. 147 |
| Rear Axle Gear Tooth Count | 55T | p. 173 |
Kubota B1550HST-D Common Problems This Manual Covers
Kubota B1550HST-D fuel filter element replacement, can't tell which part number fits older serial ranges p. 89
Open to the Fuel Filter Component Parts exploded view on page 89. Cross-reference the element callout against your tractor serial number range before ordering. The diagram breaks out the bowl, element, O-ring, and sediment cup separately, so order each piece by its own part number rather than assuming one kit covers all three.
Manual Section: Fuel Filter [Component Parts]Need to identify the HST internal components for a weak hydrostatic drive rebuild p. 134
Pull the HST Component Parts diagrams on pages 134 to 139. Match the charge pump, swash plate, and check valves against the callouts before ordering. Verify the HST gear shaft tooth count of 14T on page 133 matches your unit, since mismatched gear sets between variants will not interchange even when housings look identical.
Manual Section: HST [Component Parts]Air cleaner element and pre-cleaner part numbers unclear when ordering both at once p. 74
Check the Air Cleaner exploded view on pages 74 to 75. The primary element, dust cup, and mounting hardware each carry their own part numbers. Order the primary element by the diagram callout, not the housing assembly number, or you end up paying for the whole canister when you only need the filter.
Manual Section: Air CleanerHydraulic gear pump rebuild parts hard to identify without breaking down the assembly p. 71
Reference the Hydraulic Gear Pump diagram on page 69 and the Component Parts breakdown on pages 71 to 73. Confirm the 27T pump gear and 20T shaft gear tooth counts on page 70 before ordering the gear set. Seal kits, snap rings, and the body half are listed individually, so build your order from the callouts rather than guessing at a kit.
Manual Section: Hydraulic Gear Pump [Component Parts]Replacement battery cable and terminal hardware not obvious from a single listing p. 101
Open the Battery section on pages 101 to
Frequently Asked Questions
What are the replacement specifications for the engine oil filter?
Engine oil filter part number is 15531-32110, listed as 'FILTER OIL' in the 'OIL PAN' section of the parts manual.
What are the replacement specifications for the fuel filter?
Fuel filter element is part 15231-43560; the full fuel filter assembly is 15751-43010. Both are detailed in the 'FUEL FILTER [COMPONENT PARTS]' section.
Is this Kubota B1550HST-D Parts Catalog a digital download?
A 312-page searchable PDF downloads instantly after checkout. Open it on your laptop, tablet, or phone, then carry it right to the shop floor.
Can I print this Kubota B1550HST-D manual?
No restrictions. Print individual pages, full chapters, or the entire manual; the PDF is fully unlocked.
Does this Kubota B1550HST-D manual include hydraulic schematics?
Yes. The catalog has exploded-view diagrams for all hydraulic components, including the hydraulic pump, control valve, and hydraulic block. It does not include full hydraulic system schematics or pressure ratings, which live in a service manual.
Document Quality
This is a clean scan of a parts book, and you can search the full text because it has been processed with OCR. The text throughout the document is clear and easy to read, while the exploded-view diagrams are scanned line art with legible part numbers. The pages are in good condition, with no distracting scan artifacts, marks, or skewed pages.
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