This is the factory Kubota Workshop Manual for the B3150 and B3150SU compact tractors, a 486 page PDF covering the V1505 series diesel engine and, on cab equipped machines, the full air conditioning system.
Structured mechanism first and servicing second, it covers the engine, the hydrostatic transmission with cruise control and front wheel drive, rear and front axles, brakes, power steering, the hydraulic and three point hitch system, the electrical system with Easy Checker and digital display, and the cabin refrigeration circuit. Every section includes troubleshooting, servicing specifications, and tightening torques.
Owners and independent mechanics get the factory level detail needed to chase a weak lift, an HST drive loss, a hard start, or a cab that will not cool, and to reassemble each assembly to the correct clearances and torque values.
What's Inside This Kubota B3150, B3150SU Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 4-16 | Safety First, Safety Decals, Specifications, Traveling Speeds, Dimensions, Troubleshooting, Tightening Torques, Disassembling and Servicing (Disassembling and Assembling) |
| General | 17-83 | Tractor Identification (Model Name and Serial Number, Cylinder Number) |
| Engine | 84-90 | Lubricating System, Cooling System, Fuel System (General), Governor |
| Engine Servicing | 91-152 | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing (Checking and Adjusting, Preparation, Disassembling and Assembling) |
| Transmission | 153-185 | Structure, Front Case, Hydrostatic Transmission, Cruise Control, Range Gear Shift Section, Front Wheel Drive Section, PTO System, Differential Gear System |
| Transmission Servicing | 186-246 | Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing |
| Rear Axle | 247-249 | Structure, Rear Axle Type, Differential Gear Function |
| Rear Axle Servicing | 250-256 | Rear Axle Case, Rear Axle Shaft, Differential Lock Shift Fork, Differential Lock Clutch, Brake Shaft Assembly, Ball Bearing |
| Brakes | 257-261 | Linkage (ROPS, Cabin), Operation (During Braking) |
| Brakes Servicing | 262-272 | Brake Pedal, Rear Axle Case, Differential Lock Shift Fork, Brake Assembly, Brake Discs, Friction Plate, Cam Plate |
| Front Axle | 273-275 | Structure (Wheel Drive Model), Front Axle Construction, Power Transmission, Differential System Function |
| Front Axle Servicing | 276-292 | Front Axle, Steering Cylinder, Bevel Gear Case, Differential Gear, Spiral Bevel Pinion Shaft, Front Gear Case, Axle Flange |
| Steering | 293-298 | Hydraulic Circuit, Steering Controller, Steering Cylinder, Hydraulic Pump |
| Steering Servicing | 299-311 | Relief Valve, Hydraulic Pump, Power Steering Controller, Power Steering Cylinder, Tie-Rod, Steering Wheel |
| Hydraulic System | 312-330 | Hydraulic Circuit, Hydraulic Pump, Three Points Hydraulic System |
| Hydraulic System Servicing | 331-357 | Hydraulic Pump, Relief Valve, Lift Arm, Hydraulic Cylinder, Control Valve, Front Loader Control Valve |
| Electrical System | 358-376 | Electrical Circuit, Engine Starting System and Stopping, Lighting System, Easy Checker, Digital Display |
| Electrical System Servicing | 377-423 | Battery, Fuse, Meter Panel, Starting System, Charging System, Lighting System, Warning Lamp, Relay |
| Cabin | 424-437 | Air Conditioner System, Refrigeration System, System Control, Electrical System |
| Cabin Servicing | 438-486 | Compressor, Air Conditioner Unit, Blower Motor, Wiper Motor, Pressure Switch, Cabin Windshields, Heater Hoses |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Front wheel mounting nut torque | 77 to 90 N-m (57 to 67 lbf-ft) | p. 279 |
| Rear wheel mounting nut torque | 167 to 191 N-m (123 to 141 lbf-ft) | p. 43 |
| Cylinder head cover screw torque | 7 to 8 N-m | p. 103 |
| Cylinder head screws torque | 64 to 68 N-m (47 to 50 lbf-ft) | p. 103 |
| Hydraulic oil filter replacement interval | Replace every 400 Hr | p. 32 |
| Transmission oil filter cartridge replacement interval | Replace every 400 Hr | p. 32 |
| Fuel filter element replacement interval | every 400 Hr | p. 32 |
| Air cleaner element (Double element type) Primary element replacement interval | Replace every 1 year | p. 32 |
| Air cleaner element (Double element type) Secondary element replacement interval | Replace every 1 year | p. 32 |
| Engine oil filter replacement interval | Replace every 200 Hr | p. 32 |
| Hydraulic Hose Fittings (Hose size 02) torque | 13.8 to 15.6 N-m (10.2 to 11.5 lbf-ft) | p. 30 |
| Pipe size (φ4 x t1.0) torque | 19.7 to 29.4 N-m (14.5 to 21.6 lbf-ft) | p. 30 |
Kubota B3150, B3150SU Common Problems This Manual Covers
Weak or slow hydraulic lift
A loader or lift that becomes weak, slow, or stops responding usually means low fluid, a clogged filter or strainer, air ingress, or worn pump and valve parts. The hydraulic system servicing section covers pressure checks and repair.
Manual Section: Hydraulic System Servicing p. 287HST drive loss or jerky motion
Drive loss, jerking, or no movement often traces to low or contaminated oil, internal HST wear, or a pedal and linkage adjustment issue. The transmission servicing section covers the checks, specifications, and teardown.
Manual Section: Transmission Servicing p. 155Hard starting or stalling under load
Hard starts, stalling, or power loss commonly come from fuel restriction, air in the fuel system, a clogged fuel filter, or injector faults. The engine servicing section covers the fuel system checks and adjustment.
Manual Section: Engine Servicing p. 91Overheating or coolant loss
Overheating in dusty loader and mowing work points to low coolant, a blocked radiator, a fan belt issue, or a thermostat fault. The engine section covers the cooling system inspection.
Manual Section: Engine p. 84Weak or dragging brakes
Brakes that feel weak or drag usually need free travel adjustment or worn parts replaced. The brakes servicing section covers adjustment, servicing specifications, and disassembly.
Manual Section: Brakes Servicing p. 229Cab air conditioner will not cool
On cab machines, weak or no cooling can mean low refrigerant charge, a loose A/C belt, or a fault in the refrigeration cycle. The cabin servicing section covers refrigerant charging and system checks.
Manual Section: Cabin Servicing p. 389Frequently Asked Questions
Which models does this manual cover?
It covers the Kubota B3150 and B3150SU compact tractors with the V1505 series diesel engine, including cab equipped variants. Procedures span the engine, transmission, axles, brakes, steering, hydraulics, electrical, and cabin systems.
Does it cover the cab air conditioning system?
Yes. The Cabin Servicing section covers the air conditioner and refrigeration cycle, including precautions, evacuating and charging, and the R134a refrigerant charge amount, for full A/C diagnosis and repair. p. 389
Does it list torque and servicing specs?
Yes. Each section carries servicing specifications and tightening torques, including wheel bolt and cylinder head figures. The Engine Servicing section, from page 91, sets out the engine specs and torque values. p. 91
How do I get the manual after buying?
It is an instant download. After checkout you receive the PDF file to save and keep, so there is no shipping wait.
What format is this manual in?
A 486-page searchable PDF, ready to download right away. It runs on any device, so you can pull it up on your phone while you're under the hood. Nothing ships, nothing waits.
Is printing allowed for this Kubota B3150 Workshop Manual?
Yes. With no DRM on the PDF, you can print any page or section for the shop on any standard printer.
Are electrical wiring diagrams included in this Kubota B3150 Workshop Manual?
Yes. Full electrical schematics are included, with wire routing diagrams, connector identification, and circuit descriptions.
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