Part of the Kubota Parts Manuals.
Every exploded-view diagram and part number for the B20 compact tractor sits in these 251 pages, from the crankcase back to the ROPS. The catalog runs over 120 illustrated parts lists, with callout numbers tied to genuine Kubota part numbers and breakdowns of the engine, HST drivetrain, hydraulic lift, chassis, and cab assemblies. Flip to the injection pump or control valve and each component is numbered, named, and ready to cross-reference. Ordering pistons? Standard bore takes a +0.5mm oversize, the crankpin metal runs to a -0.2mm undersize, and the nozzle holder adjusting washers range from 1.00mm to 1.95mm. No more squinting at a worn parts decal or ordering the wrong bushing twice. Bookmarks are set by system, so you jump straight to the assembly you're rebuilding and pull the exact number.
What's Inside This Kubota B20 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Nozzle Holder, Fuel Camshaft, Injection Pump, Engine Stop Lever, Speed Control Plate, Governor, Air Cleaner, Engine Stop Rod, Accelerator Lever, Fuel Tank, Fuel Pipe 1, Fuel Filter, Fuel Pipe 2, Speed Control Pedal | |
| Cooling System | Water Pump, Water Flange/Thermostat, Fan, Water Pipe, Radiator | |
| Engine | Crankcase, Oil Pan, Piston/Crankshaft, Main Bearing Case, Flywheel, Cylinder Head, Valve/Rocker Arm, Cylinder Head Cover, Inlet Manifold, Exhaust Manifold, Camshaft, Gear Case, Muffler, Bevel Gear Case | |
| Electrical System | Dynamo, Starter, Battery, Light, Panel/Switch, Wire Harness, Rear Working Light, Front Working Light | |
| Clutch & Transmission | Clutch, Clutch Rod, Clutch Pedal, Clutch Housing, Transmission Case, Transmission Case Cover, Hi-Lo Gear Shift Lever, Hi-Lo Gear Shift Fork | |
| PTO | PTO Shaft, Front Wheel Drive Lever/PTO Lever, PTO Fork Shaft | |
| Rear Axle, Differential & Brakes | Rear Differential, Rear Axle, Rear Axle Case, Brake, Brake Rod, Brake Pedal | |
| Front Axle & Steering | Propeller Shaft, Front Axle Case, Front Axle Arm, Front Differential, Front Axle Frame, Knuckle Arm/Tie Rod, Power Steering | |
| Hydraulics & 3-Point Hitch | Hydraulic Gear Pump, Hydraulic Pipe, Hydraulic Block, Lift Arm, Hyd.Cylinder Cap, Control Valve, Control Valve 1, Control Valve 2, Control Valve 3, Top Link, Lower Link / Lift Rod, Top Link Bracket | |
| Body & Operator Station | Main Frame, Hood, Hood Cover Rear, Front Grille, Fender, Seat, Seat Turn Table, Seat Base, Seat Plate, Step, ROPS, FOPS | |
| Decals & Accessories | Label 1, Label 2, Accessories and Service Parts | |
| Other Components | Release Lever, HST, St Shaft/2Nd Shaft, Rd Shaft, Th Shaft, Front Drive Shaft/6Th Shaft, Neutral Holder, Speed Change Plate, Front Drive Fork, Diff.Lock Pedal, Rear S.S. Sure Grip Tire, Rear Ind.Sure Grip Tire, Bevel Gear Shaft, Front Drive Shaft, Front Sure Grip Tire, Check Chain |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuse Rating | 15A | p. 95 |
| Piston Oversize | +0.5MM | p. 11 |
| Metal Crankpin Undersize | -0.2MM | p. 11 |
| Nozzle Holder Adjusting Washer Thickness (Min) | 1.00MM | p. 23 |
| Nozzle Holder Adjusting Washer Thickness (Max) | 1.95MM | p. 23 |
| Injection Pump Shim Thickness | 0.15MM | p. 41 |
| Wire Harness Fuse Rating | 15A | p. 95 |
| HST Gear Tooth Count | 17T | p. 107 |
| 1st Shaft Gear Tooth Count | 16T | p. 114 |
| Rear Differential Bevel Gear Ratio | 6-37T | p. 142 |
| Rear Axle Gear Tooth Count | 60T | p. 146 |
| Rear Tire Size | 12.4-16 | p. 149 |
Kubota B20 Common Problems This Manual Covers
Kubota B20 fuel filter part numbers hard to match when ordering a replacement element p. 76
Open the Fuel Filter component parts breakdown on page 76. Match the filter element to its callout number, then read the part number straight off the parts list. Cross-check it against your serial number range before ordering. The injection pump this filter feeds uses a separate 0.15MM shim, listed on page 41.
Manual Section: Fuel Filter [Component Parts]Can't find the correct 15A fuse part number in the wire harness parts list p. 94
Find the fuse holder callout in the Wire Harness exploded view on page 94. Read the matching part number from the parts list, then confirm the rating reads 15A, the spec documented on page 95. Check the part number against your serial number range so the replacement fuse fits the holder.
Manual Section: Wire HarnessHydrostatic transmission internal gear and seal parts hard to identify without an exploded view p. 108
Trace the worn gear or seal to its callout number in the HST component parts breakdown that starts on page 108, then pull the matching part number from the list. Verify the gear shows 17 teeth, the spec on page 107, since several similar-looking gears share this assembly. Match everything to your serial number range.
Manual Section: HST [Component Parts]Fuel shut-off solenoid and key switch part numbers keep getting mixed up when ordering p. 92
Check the Panel/Switch exploded view on page 92 for the key switch callout and its part number. The fuel shut-off solenoid sits in the Engine Stop Rod group on page 66. Read both numbers off the parts lists. Each circuit runs through the 15A harness fuse shown on page 95, so confirm your serial range first.
Manual Section: Panel/SwitchWrong tire size ordered because front and rear tire part numbers look nearly identical p. 149
Confirm the size stamped on the Rear Sure Grip Tire diagram on page 149 reads 12.4-16 before pulling the part number. Front tires are a separate assembly on page 171, sized 23 x 8.50-12. Match each tire and rim part number against your serial number range.
Frequently Asked Questions
What are the replacement specifications for Fuel filter?
The complete fuel filter assembly is part number 15751-43010, and the replaceable element inside it is 15231-43560. Both are listed on page 77 in the 'FUEL FILTER [COMPONENT PARTS]' section.
What are the replacement specifications for Air filter?
Order the complete air cleaner assembly under part number 15852-11010, and the replaceable element that fits inside it is part number 15852-11080. Page 63 details both in the 'AIR CLEANER' section.
What tire sizes does the Kubota B20 use?
The rear Sure Grip tires are 12.4-16, listed on page 149. The front Sure Grip tires are 23 x 8.50-12. Both tire and rim assemblies appear in the parts catalog with OEM Kubota part numbers.
What is the HST gear tooth count specification for the Kubota B20?
The HST gear shows 17 teeth, documented on page 107. The HST component parts breakdown starting on page 108 lists each gear, bearing, and seal with its OEM part number so you can pinpoint the exact replacement.
How will I receive this Kubota B20 Parts Manual?
Right after payment clears, the full 251-page searchable Parts Manual downloads as a PDF. Open it on a laptop, tablet, or phone out in the shop.
Can I print this manual?
Yes, with no restrictions. The PDF is DRM-free, so print whatever sections you want to carry out to the shop. Standard letter or A4 paper both work fine.
Can I find hydraulic circuit diagrams in this Kubota B20 manual?
This is a parts catalog. It includes detailed exploded-view diagrams for hydraulic components, including pumps, valves, and piping, with OEM part numbers showing how assemblies fit together. It does not contain hydraulic circuit schematics or flow diagrams; those live in the B20 service/workshop manual.
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