This factory parts catalog covers the Kubota B5100E-P, B5100E, B5100D-P, and B5100E-PT compact diesel tractors in one downloadable PDF. It maps the whole machine by group, including the crankcase, cylinder head, injection pump, clutch, transmission shafts, differential, hydraulic control valve, steering, brakes, and the front axle groups that differ between the two wheel drive and four wheel drive variants.Each group combines an exploded diagram with a parts table listing reference numbers, Kubota part numbers, quantities, and serial number ranges, plus interchangeability notes, so you can pinpoint the correct part for your specific variant and serial number.Use it to order the right transmission input shaft seal, bearings, filters, or engine parts, and to tell the E, E-P, D-P, and E-PT components apart when a repair or full service comes due on your B5100.
What's Inside This Kubota B5100 Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Clutch & Transmission | Clutch, Transmission Case, Clutch Rod, 1st Shaft 4th Shaft, 2nd Shaft Reverse Shaft, Main Speed Change, Aux.Speed Change, Clutch Housing | |
| Fuel System | Nozzle Holder, Injection Pump, Speed Control Plate, Governor, Accelerator Pedal, Fuel Tank, Air Cleaner, Fuel Filter | |
| Cooling System | Radiator | |
| Engine | Crankcase, Cylinder Head, Gear Case, Bearing Case, Breather, Inlet Manifold, Valve Rocker Arm, Head Cover, Camshaft, Piston Crank Shaft, Flywheel, Muffler | |
| Electrical System | Dynamo, Starter, Battery | |
| PTO | 3rd 5th PTO Shaft | |
| Rear Axle, Differential & Brakes | Axle Case, Rear Wheel, Brake, Brake Rod | |
| Front Axle & Steering | Front Drive, Steering, Front Wheel Support, Front Axle, Front Wheel | |
| Hydraulics & 3-Point Hitch | Oil Pressure Pump, Control Valve, 3-Point Linkage | |
| Body & Operator Station | Case Cover, Seat, Fender, Bonnet, Panel | |
| Decals & Accessories | Name Plate, Accessary and Service Parts | |
| Other Components | Differential, Oil Pressure Pipe, Oil Pressure Group 1, Oil Pressure Group 2 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil filter weight | 0.14 kgf | p. 6 |
| Air cleaner body weight | 0.69 kgf | p. 115 |
| 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
Leaking transmission input shaft seal
Oil weeping from the transmission input shaft is a well known B5100 repair. The 1st Shaft 4th Shaft Group section shows the shaft, seal, and bearings so you order the correct seal for your serial number.
Manual Section: 1st Shaft 4th Shaft Group p. 61Worn driveline bearings
Cheap or aged jackshaft and transmission bearings create noise and play in the drivetrain. The Transmission Case Group section lists the case bearings and related parts to renew them.
Manual Section: Transmission Case Group p. 51Clutch slipping or dragging
A worn clutch disc or release parts make the drive grab or slip. The Clutch Group section identifies the disc, cover, and release bearing for a rebuild.
Manual Section: Clutch Group p. 37Hard starting after sitting
A tractor with unknown service history often needs fuel filtration and injection attention before it runs cleanly. The Fuel Filter Group section shows the filter and fuel parts to replace.
Manual Section: Fuel Filter Group p. 116Weak three point hydraulics
Worn valve parts or seals leave the hitch slow or unable to hold an implement. The Control Valve Group section covers the valve body, spools, and seals.
Manual Section: Control Valve Group p. 79Front axle wear on 4WD variants
The powered front axle develops play and leaks with age. The Front Axle Group section covers the front axle housing, gears, and seals for the B5100E.
Manual Section: Front Axle Group [B5100E] p. 118Frequently Asked Questions
Which Kubota models does this parts catalog cover?
It covers four B5100 variants: the B5100E-P, B5100E, B5100D-P, and B5100E-PT compact diesel tractors. Shared engine and driveline groups apply to all, while separate front axle and front wheel groups cover the two wheel drive and four wheel drive versions.
How do I make sure a part fits my exact tractor?
Each listing includes a serial number range and interchangeability note. Match your tractor's serial number against the range shown so you order the version of the part that fits, since some components changed during production.
Where is the transmission input shaft seal listed?
The 1st Shaft 4th Shaft Group section shows the transmission input shaft along with its seal and bearings, which is the area owners reseal when the transmission leaks oil at the input. p. 61
Does it cover the three point hitch parts?
Yes. The 3-Point Linkage Group section lists the linkage parts shared across the B5100D-P, B5100E-P, and B5100E-PT, and the Control Valve Group covers the hydraulic valve. p. 122
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.
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