Four tractor variants live in this Kubota B5100E Parts Catalog PDF (OEM #100K0037): the B5100E, B5100E-P, B5100D-P, and B5100E-PT. The 125 pages break down into 64 pages of exploded-view parts lists covering crankcase, injection pump, flywheel, starter, and governor assemblies, with a cross-reference index tying each system to its assembly group. Twelve hydraulic pages detail the control valve and oil pressure pipes; 26 drivetrain pages run through transmission, differential, PTO shafts, and front drive. Every listing shows the OEM Part No., Ref. No., quantity, and factory weight: Bearing Ball 6303 at 0.112 kgf, input shaft seal at 0.009 kgf. No more reading a worn casting number to a parts clerk who still gets it wrong. Bookmarked and keyword-searchable, it puts your cursor on the right number before you walk out to the machine.
What's Inside This Kubota B5100 Series Parts Manual
| System | Pages |
|---|---|
| Crankcase Group | 5-6 |
| Cylinder Head Group | 7-8 |
| Gear Case Group | 9-10 |
| Bearing Case Group | 11-12 |
| Breather Group | 13-14 |
| Inlet Manifold Group | 15-16 |
| Valve Rocker Arm Group | 17-18 |
| Head Cover Group | 19-20 |
| Camshaft Group | 21-22 |
| Piston Crank Shaft Group | 23-24 |
| Flywheel Group | 25-26 |
| Nozzle Holder Group | 27-28 |
| Injection Pump Group | 29-30 |
| Speed Control Plate Group | 31-32 |
| Governor Group | 33-34 |
| Dynamo Group | 35-36 |
| Clutch Group | 37-38 |
| Name Plate Group | 39-46 |
| Starter Group | 47-48 |
| Oil Pressure Pump Group | 49-50 |
| Transmission Case Group | 51-52 |
| Case Cover Group | 53-54 |
| Axle Case Group | 55-56 |
| Rear Wheel Group | 57-58 |
| Clutch Rod Group | 59-60 |
| 1st Shaft 4th Shaft Group | 61-62 |
| 2nd Shaft Reverse Shaft Group | 63-64 |
| 3rd 5th PTO Shaft Group | 65-66 |
| Differential Group | 67-68 |
| Main Speed Change Group | 69-70 |
| Aux.Speed Change Group | 71-72 |
| Front Drive Group | 73-74 |
| Brake Group | 75-76 |
| Oil Pressure Pipe Group | 77-78 |
| Control Valve Group | 79-80 |
| Oil Pressure Group 1 | 81-82 |
| Oil Pressure Group 2 | 83-84 |
| Steering Group | 85-86 |
| Brake Rod Group | 87-88 |
| Accelerator Pedal Group | 89-90 |
| Seat Group | 91-92 |
| Clutch Housing Group | 96-97 |
| Front Wheel Support Group | 98-99 |
| Radiator Group | 100-101 |
| Fender Group | 102-103 |
| Bonnet Group | 104-105 |
| Muffler Group | 106-107 |
| Fuel Tank Group | 108-109 |
| Battery Group | 110-111 |
| Panel Group | 112-113 |
| Air Cleaner Group | 114-115 |
| Fuel Filter Group | 116-117 |
| Front Axle Group [B5100E] | 118-119 |
| Front Wheel Group [B5100E-P B5100E-Pt] | 120-121 |
| 3-Point Linkage Group [B5100D-P B5100E-P B5100E-Pt] | 122-124 |
| Accessary and Service Parts Group | 125 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Transmission input shaft seal weight | 0.009 kgf | p. 62 |
| Bearing Ball (6303) weight | 0.112 kgf | p. 62 |
| Oil filter weight | 0.14 kgf | p. 6 |
| Fuel filter element weight | 0.03 kgf | p. 117 |
| Air cleaner body weight | 0.69 kgf | p. 115 |
| Transmission washer seal weight | 0.003 kgf | p. 52 |
| Cylinder Head Stud Diameter | 5.5-6 mm | p. 7 |
| Rocker Arm/Adjusting Screw Diameter | 26-25.5 mm | p. 17 |
Kubota B5100 Series Common Problems This Manual Covers
Kubota B5100E transmission input shaft leaking, need correct seal part number to order p. 61
Check the 1st Shaft 4th Shaft Group exploded view on page 61. The transmission input shaft seal is listed at 0.009 kgf on page 62. Locate the part number in the adjacent parts list and verify the serial number applicability column to confirm the correct seal for your machine before ordering.
Manual Section: 1St Shaft 4Th Shaft GroupDrivetrain noise from transmission area, need to identify correct jackshaft bearing part number p. 61
Trace the noise to the 1st Shaft 4th Shaft Group on page 61 and find the jackshaft bearing in the exploded view. It is a Ball type (6303), listed at 0.112 kgf on page 62. Record the part number and cross-check the serial number column for applicability before placing your order.
Manual Section: 1St Shaft 4Th Shaft GroupDoing a complete service, need part numbers for engine oil, fuel, and air filters p. 5
Find the engine oil filter in the Crankcase Group on page 5, listed at 0.14 kgf on page 6. Locate the air cleaner element in the Air Cleaner Group on page 114 and the fuel filter element on page 116. Note each part number and verify the serial number column for your specific machine before ordering.
Manual Section: Crankcase GroupHydraulic or transmission fluid seeping from case area, need correct seal and gasket part numbers p. 51
Open the Transmission Case Group parts diagram on page 51. The transmission washer seal is listed at 0.003 kgf on page 52; work out from there to the other seal and gasket numbers in the exploded view. Confirm the serial number applicability column for each line item before building your complete seal order.
Manual Section: Transmission Case GroupPTO shaft components worn, need correct part numbers for shims and pin joints for mower hookup p. 65
Turn to the 3rd 5th PTO Shaft Group on page 65. The pin joint diameter is 72-77 mm and the shim thickness is 0.5 mm, both listed on pages 65-66. Locate the part numbers for your worn components in the exploded view and verify the serial number column before ordering.
Manual Section: 3Rd 5Th PTO Shaft GroupHydraulic control valve parts worn, need correct part numbers for control valve components p. 79
Reference the Control Valve Group exploded view on page 79, where the control valve collar measures 13-13.5 mm. Identify each valve component you need in the parts list, then confirm the part number against your serial number applicability column before ordering.
Manual Section: Control Valve GroupFrequently Asked Questions
What are the replacement specifications for transmission input shaft seal?
The 1ST SHAFT 4TH SHAFT GROUP lists a "SEAL OIL," part number 09500-17308, at 0.009 kgf (0.0198 lb). Dimensions, clearances, and installation steps are not included in this parts book.
What do I get after purchasing this Kubota B5100 Series manual?
Right after checkout you get the full 125-page searchable PDF. It opens on any device, so you can pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this Kubota B5100 Series Parts Catalog printable?
Yes. Print as many copies as you want, with no restrictions. Plenty of mechanics print just the section they need and carry it to the shop floor.
Are there hydraulic schematics in this Kubota B5100 Series manual?
This is a parts catalog, so it shows exploded parts diagrams rather than circuit schematics. It includes detailed exploded views of the hydraulic components, pump, control valve, cylinder, and oil lines, with OEM part numbers, not wiring-style circuit diagrams.
Document Quality
This PDF is a scanned document with an OCR layer, allowing you to search and copy the full text content. The text is crisp and generally easy to read throughout the document. Diagrams and illustrations are scanned images, not vector, so some details may appear less sharp when highly magnified, but labels are mostly readable. Pages are clean with minimal scan artifacts, and there is one notable filler page indicating "IMAGE NOT AVAILABLE".
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