Part of the Kubota Repair Manuals.
This Kubota Shop Manual (publication 9Y111-11322) is the factory service reference for the BX25DLB-AU sub-compact tractor and its matched attachments, the LA240A AU-SG front loader and the BT602 backhoe, built from 2014 to 2019. The 411-page PDF splits each system into structure and servicing so you understand the machine before you take it apart.It covers the engine, transaxle and hydrostatic drive, front axle, steering, hydraulics, the electrical system with wiring diagrams, and both the front loader and backhoe. Every servicing chapter carries troubleshooting charts, servicing specifications, tightening torques, and step-by-step disassembly and assembly.Whether you are diagnosing a no-start interlock, adjusting the HST pedal, testing the battery and starter, or setting backhoe cylinder torques, this manual gives the exact Kubota procedures a BX25DLB-AU owner or mechanic needs.
What's Inside This Kubota BX25DLB-AU, LA240A AU-SG, BT602 Manual
| System | Pages | Key Topics |
|---|---|---|
| Record of Revisions | - | - |
| Information | - | - |
| General | - | Identification, Handling Precautions for Electrical Parts and Wiring, Lubricants, Fuel and Coolant (Bx Tractor, Front Loader, Backhoe) |
| Engine | - | Lubricating System, Cooling System, Fuel System |
| Engine Servicing | - | Engine Body, Lubricating System, Cooling System, Fuel System, Cylinder Head, Valves |
| Transaxle | - | Structure, Traveling System (Hydrostatic Transmission, Range Gear Shift Section, Front Wheel Drive Section, Differential Gear Section, Brake Section) |
| Transaxle Servicing | - | Hydrostatic Transmission, Hydraulic Cylinder, Transaxle, PTO Clutch, Differential, Brake |
| Front Axle | - | Structure, Camber, Kingpin Angle, Caster, Toe-In |
| Front Axle Servicing | - | Power Steering Cylinder, Bevel Gear Case, Front Gear Case, Differential Gear |
| Steering | - | Hydraulic Circuit, Steering Controller, Steering Cylinder |
| Steering Servicing | - | Relief Valve, Steering Controller, Power Steering Cylinder, Tie-Rod, Meter Panel |
| Hydraulic System | - | Hydraulic Circuit, Hydraulic Pump, Control Valve, Flow Priority Valve, Relief Valve, Hydraulic Cylinder, Hydraulic Block Type Outlet, Mower Linkage |
| Hydraulic System Servicing | - | Relief Valve, Hydraulic Pump, Mower Lift Linkage, Hydraulic Cylinder, Control Valve |
| Electrical System | - | Wiring Diagram, Starting System (Main Switch Position, Safety Switch, Operator Presence Control), Charging System (Electrical Circuit, Ic Regulator), Lighting System |
| Electrical System Servicing | - | Battery, Main Switch, Starter, Glow Plug, Safety Switch, Fuel Pump, Alternator |
| Front Loader | - | Hydraulic Circuit Schematic, Control Valve Assembly, Boom Cylinder and Bucket Cylinder, Relief Valve |
| Front Loader Servicing | - | Spill Guard, Bucket, Boom, Hydraulic Cylinders, Side Frames, Main Frames |
| Backhoe | - | Hydraulic Circuit, Control Valve (Structure, Operation, Overload Relief Valve), Hydraulic Cylinder |
| Backhoe Servicing | - | Control Valve, Boom, Dipperstick, Bucket, Swing Cylinder, Stabilizer Cylinder |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Boom cylinder head torque | 350 to 400 N-m | p. 396 |
| Dipperstick cylinder, stabilizer cylinder head torque | 250 to 280 N-m | p. 396 |
| Battery Voltage (Factory Specification) | More than 12 V | p. 309 |
| Battery Potential Difference (Allowable Limit) | Less than 0.1 V | p. 309 |
| Battery Terminal Connection Potential difference (Allowable Limit) | Less than 0.1 V | p. 312 |
| Starter Commutator O.D. (Factory Specification) | 30.0 mm | p. 309 |
| Starter Commutator O.D. (Allowable Limit) | 29.0 mm | p. 309 |
Kubota BX25DLB-AU, LA240A AU-SG, BT602 Common Problems This Manual Covers
Engine cranks but will not start
A BX25D that cranks without firing often has a safety switch that is not fully engaged or a weak battery. The Electrical System section covers the starting system, safety switch, and operator presence control.
Manual Section: Electrical System p. 288Sputters or stalls under load
Fuel starvation from tank debris or a clogged pickup and filter causes sputtering and stalling. The Engine Servicing section provides fuel system troubleshooting and the checks to clear the restriction.
Manual Section: Engine Servicing p. 92Weak or slow loader and backhoe hydraulics
Slow or weak loader and backhoe movement usually points to low fluid, a clogged filter, or internal leakage. The Hydraulic System Servicing section walks through troubleshooting and pressure checks.
Manual Section: Hydraulic System Servicing p. 269Slow HST or reverse pedal response
A reverse pedal that returns slowly or delayed movement often needs hydrostatic linkage adjustment. The Transaxle Servicing section covers the HST checks and adjustment procedure.
Manual Section: Transaxle Servicing p. 164Overheating under work load
Rising temperature under load is commonly dust and debris blocking the radiator or a worn fan belt. The Engine section documents the cooling system so airflow and coolant flow can be verified.
Manual Section: Engine p. 87No charging or dead accessories
No charge or failing electrical accessories can be the alternator, a blown fuse, or corroded connections. The Electrical System Servicing section covers charging system troubleshooting and checks.
Manual Section: Electrical System Servicing p. 302Frequently Asked Questions
Which machines and years does this manual cover?
It is the shop manual for the Kubota BX25DLB-AU tractor with the LA240A AU-SG front loader and BT602 backhoe, covering machines built from 2014 to 2019.
Does it include torque specs for the BT602 backhoe?
Yes. The Backhoe Servicing section lists cylinder torques such as the boom cylinder head at 350 to 400 N-m and the bucket cylinder head at 200 to 230 N-m. p. 391
Does it cover battery and starter testing?
Yes. The Electrical System Servicing section gives values such as more than 12 V at the battery, 1.260 specific gravity at full charge, and a 30.0 mm starter commutator O.D. p. 302
Can it diagnose a no-crank safety switch problem?
Yes. The Electrical System section covers the starting system, safety switch, and operator presence control that cause no-crank faults on the BX25D. p. 288
How quickly can I access this manual?
Download the PDF the moment payment clears. The full 411-page searchable Shop Manual is yours instantly, ready to open on a laptop, tablet, or phone right in the shop.
Is this Kubota BX25DLB-AU manual print-friendly?
Yes. The PDF carries no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Are hydraulic system diagrams in this Kubota BX25DLB-AU Shop Manual?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Kubota BX25DLB-AU, LA240A AU-SG, BT602.
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