Part of the Kubota Repair Manuals.
This Kubota Workshop Manual (publication 9Y111-01970) is the factory service reference for the BX25 sub-compact tractor with its LA240 front loader, BT601 backhoe, and the RCK54, RCK54P, and RCK60B rotary mower decks. Built around the D902-E3-BX-2 diesel engine, the 427-page PDF follows Kubota's Mechanism and Servicing layout.It documents the engine, transaxle and hydrostatic drive, front axle, steering, hydraulic system, and the full electrical system with wiring diagrams, plus dedicated chapters for the rotary mower, front loader, and backhoe. You get troubleshooting, servicing specifications, tightening torques, continuity checks, and disassembly and assembly steps.Owners and independent mechanics reach for it to solve a no-start, restore weak loader lift, service the mower deck, or set the correct wheel and blade torques using numbers taken directly from Kubota.
What's Inside This Kubota BX25 Package Manual
| System | Pages | Key Topics |
|---|---|---|
| General | - | Tractor Identification, Wiring, Battery, Fuse, Connector, Handling of Circuit Tester, Lubricants Fuel and Coolant |
| Engine | - | Lubricating System, Cooling System, Fuel System |
| Transaxle | - | Travelling System, Hydrostatic Transmission, Range Gear Shift Section, Front Wheel Drive Section, Differential Gear Section, Brake Section, PTO System, PTO Clutch and Valve |
| Front Axle | - | Front Wheel Alignment, Camber, Kingpin Angle, Caster, Toe-In, Checking, Disassembling and Servicing |
| Steering | - | Hydraulic Circuit, Steering Controller, Steering Cylinder |
| Hydraulic System | - | Hydraulic Circuit, Hydraulic Pump, Control Valve, Flow Priority Valve, Relief Valve, Hydraulic Cylinder, Hydraulic Block Type Outlet, Mower Linkage |
| Electrical System | - | Wiring Diagram, Starting System, Main Switch Position, Safety Switch, Operator Presence Control (Opc), Charging System, Electrical Circuit, Ic Regulator (3P Connector Type) |
| Rotary Mower | - | Power Transmission, Lifting Mechanism, Self-Balancer System |
| Front Loader | - | Hydraulic Circuit, Control Valve Assembly, Boom Cylinder and Bucket Cylinder |
| Backhoe | - | Safety Decals, Backhoe Terminology, Operating Dimensions, Digging Force (per Sae J49), Cycle Time (Seconds), Hydraulic Cylinders, Bucket Sizes, Lift Capacity (per Sae J31) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Relief valve readjustment pressure range | 15.0 to 20.0 MPa (153 to 203 kgf/cm², 2180 to 2900 psi) | p. 164 |
| Bevel gear case mounting screw (M12) torque | 77.5 to 90.2 N·m (7.9 to 9.2 kgf·m, 57.2 to 66.5 ft-lbs) | p. 205 |
| Front gear case cover mounting screw torque | 48.1 to 55.8 N·m (4.9 to 5.7 kgf·m, 35.5 to 41.2 ft-lbs) | p. 205 |
| Transmission oil filter replacement interval | Initial 50 hours, Every 200 hours | p. 25 |
| Fuel filter element check interval | Every 100 hours | p. 25 |
| Fuel filter element replacement interval | Every 500 hours | p. 25 |
| Battery type | 526RA | p. 32 |
| Battery voltage | 12 V | p. 32 |
| Main switch continuity (OFF Position, B terminal - ACC terminal) | Infinity | p. 287 |
| Main switch continuity (OFF Position, B terminal - ST terminal) | Infinity | p. 287 |
| Main switch continuity (OFF Position, B terminal - G terminal) | Infinity | p. 287 |
| Main switch continuity (ON Position, B terminal - ACC terminal) | 0 Ω | p. 287 |
Kubota BX25 Package Common Problems This Manual Covers
Tractor will not crank or start
A BX25 that will not crank usually has a safety interlock fault, a weak battery, or corroded wiring. The Electrical System section covers the starting system, safety switch, and main switch continuity checks.
Manual Section: Electrical System p. 263Front loader feels weak or low on lift
Weak loader lift can be low hydraulic fluid, a clogged filter, or air in the circuit as well as design limits. The Front Loader section details the hydraulic circuit and control valve to trace the cause.
Manual Section: Front Loader p. 347Backhoe controls sloppy or slow to return
Backhoe control linkage can go dry or sloppy and benefit from lubrication and adjustment. The Backhoe section covers the hydraulic circuit, control valve, and cylinders for setup and service.
Manual Section: Backhoe p. 377Weak or inconsistent hydraulics
Slow or inconsistent hydraulic function often points to low fluid, contamination, or a clogged filter. The Hydraulic System section documents the mechanism and servicing to isolate the weak point.
Manual Section: Hydraulic System p. 232Reverse pedal slow to return
A hydrostatic reverse pedal that returns slowly usually needs linkage or return spring adjustment. The Transaxle section covers the hydrostatic transmission and travelling system for correct setup.
Manual Section: Transaxle p. 129Mower deck belt or spindle service
The RCK54, RCK54P, and RCK60B decks need periodic belt and spindle service to cut cleanly. The Rotary Mower section covers the mechanism and servicing, including blade hardware torque.
Manual Section: Rotary Mower p. 309Frequently Asked Questions
Which machines does this manual cover?
It is the workshop manual for the Kubota BX25 tractor with the LA240 front loader, BT601 backhoe, and the RCK54, RCK54P, and RCK60B rotary mower decks.
What engine does it cover and are engine specs included?
It covers the D902-E3-BX-2 diesel. The Engine section gives specifications such as 3.53 to 4.02 MPa compression pressure and a cold valve clearance of 0.145 to 0.185 mm. p. 64
Does it list mower deck torque specs?
Yes. The Rotary Mower section gives the mower blade screw torque of 102.9 to 117.7 N.m (75.9 to 86.8 ft-lbs) for the RCK54 and RCK60B decks, plus deck service steps. p. 309
Can it help with a no-start problem?
Yes. The Electrical System section covers the safety switches and main switch continuity values used to diagnose why a BX25 will not crank or start. p. 263
What format is this manual in?
Immediate download of the complete 427-page searchable Workshop Manual. Open it on any device: a laptop at your desk or your phone out in the field.
Are there any print restrictions on this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are electrical wiring diagrams included in this Kubota BX25 & variants manual?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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