Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the BX23S-AU sub-compact tractor together with the LA340AU front loader, the BT603 backhoe, and the RCK54D, RCK60D, RCK54, and RCK60B rotary mower decks. It is the factory service manual, publication number 9Y111-18062, running 532 pages.The manual is organized by system: the D902 engine, transaxle, front axle, steering, hydraulic system, mower, and electrical system, plus dedicated Front Loader and Backhoe sections for the LA340 and BT603 attachments. It carries torque values, clearances, servicing procedures, and mechanism descriptions.Use it to torque wheel and mower hardware correctly, service the loader and backhoe hydraulics and quick-attach, set up the mower deck, or trace an electrical fault, all with factory specifications for the BX23S and its implements.
What's Inside This Kubota BX23S-AU Package Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | - | - |
| General | - | Identification, General Precautions, Handling Precautions for Electrical Parts and Wiring, Lubricants, Fuel and Coolant, Tightening Torques, Maintenance Check List, Check and Maintenance, Tires, Wheels, And Ballast, Implement Limitations, Special Tools |
| Engine | - | Cylinder Block, Breather, Head Cover, Piston, Piston Ring, Connecting Rod, Crankshaft, Rocker Arm |
| Transaxle | - | Traveling System, Hydrostatic Transmission, PTO System, Front Wheel Drive Section, Differential Gear Section, Differential Lock, Brake Section |
| Front Axle | - | Front Wheel Alignment, Front Axle Rocking Force, Front Wheel Steering Angle, Propeller Shaft, Power Steering Cylinder, Bevel Gear Case, Front Gear Case |
| Steering | - | Steering Controller, Steering Cylinder, Power Steering Body, Power Steering Hose, Tie-Rod |
| Hydraulic System | - | Hydraulic Pump, Control Valve, Flow Priority Valve, Relief Valve, Hydraulic Cylinder, Hydraulic Block Type Outlet, Mower Linkage, Front Loader Valve |
| Mower | - | Universal Joint, Rear Link, Front Link, Balancer, Mower Blades, Mower Belt, Gear Box |
| Electrical System | - | Wiring Diagram, Electrical Connector, Electrical Wiring Chart Symbols, Color of Wiring, Unit Symbol, Connector Arrangement, Electrical Circuit of Starting System, Function of Relay |
| Front Loader | - | Hydraulic Circuit, Boom Cylinder, Bucket Cylinder, One Touch Front Loader, Quick Touch Coupler, Auto Lock Attachment, Mechanical Loader Frame |
| Backhoe | - | Hydraulic Circuit, Control Valve, Overload Relief Valve, Hydraulic Cylinder |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| BX23S-AU | ||
| Front wheel bolt torque | 149.2 to 179.0 N·m (15.2 to 18.3 kgf·m, 110 to 132 lbf·ft) | p. 81 |
| Rear wheel bolt torque | 108.5 to 130.2 N·m (11.1 to 13.3 kgf·m, 80 to 96 lbf·ft) | p. 81 |
| Engine Gross Power | 17.1 kW (23.0 HP) | p. 38 |
| Total Displacement | 898 cm³ (54.8 cu. in.) | p. 38 |
| Fuel Tank Capacity | 25 L (6.6 U.S.gals.) | p. 38 |
| Engine Crankcase Capacity (with filter) | 3.3 L (3.5 U.S.qts.) | p. 38 |
| RCK54-23BX, RCK54D-26BX | ||
| Mower blade screw torque | 102.9 to 117.6 N·m (10.5 to 12.0 kgf·m, 75.9 to 86.8 lbf·ft) | p. 96 |
| All Models | ||
| Quick coupler cartridge tightening torque | 27 to 33 N·m (2.8 to 3.3 kgf·m, 20 to 24 lbf·ft) | p. 475 |
| Hose fitting, flare nut (UNF) 9/16 tightening torque | 25 to 28 N·m (2.6 to 2.8 kgf·m, 19 to 20 lbf·ft) | p. 67 |
| Hose fitting, flare nut (UNF) 3/4 tightening torque | 36 to 40 N·m (3.7 to 4.0 kgf·m, 27 to 29 lbf·ft) | p. 67 |
| Mower blade screw torque | 102.9 to 117.6 N·m (10.5 to 12.0 kgf·m, 75.9 to 86.8 lbf·ft) | p. 96 |
| Front tip and rear tip of blade difference | 0.0 to 5.0 mm (0.0 to 0.20 in.) | p. 350 |
Kubota BX23S-AU Package Common Problems This Manual Covers
Loader will not lock under load
The LA340 quick-attach can bind if weight is still on the loader when you try to lock or unlock it. The Front Loader section covers the mount, the locks, and the correct attach procedure.
Manual Section: Front Loader p. 426Hydraulic couplers hard to disconnect
Trapped pressure in the loader or backhoe couplers makes lines hard to connect or release. The hydraulic system section covers relieving pressure and coupler service.
Manual Section: Hydraulic System p. 293Backhoe functions weak or erratic
A BT603 backhoe that responds poorly often needs hydraulic adjustment or attention to its couplers and cylinders. The Backhoe section covers its mechanism and servicing.
Manual Section: Backhoe p. 477Rear axle seal seepage after service
Fluid weeping around the rear axle after work usually means a seal that needs reseating or replacing rather than major repair. The transaxle section covers axle seal servicing.
Manual Section: Transaxle p. 194Mower deck engages poorly or misaligns
Trouble mounting or driving the deck typically traces to alignment, drive-line positioning, or setup of the quick-mount hardware. The mower section covers deck servicing and setup.
Manual Section: Mower p. 346Heavy or unresponsive steering
Stiff steering can come from the steering controller or low hydraulic pressure. The steering section covers its mechanism and servicing.
Manual Section: Steering p. 276Electrical faults or dead accessories
Intermittent electrical problems usually trace to wiring, fuses, or connectors. The electrical system section covers servicing and diagnosis.
Manual Section: Electrical System p. 371Frequently Asked Questions
Which machines does this cover?
The Kubota BX23S-AU tractor, the LA340AU front loader, the BT603 backhoe, and the RCK54, RCK54D, RCK60B, and RCK60D mower decks, powered by the D902 engine.
Does it cover the backhoe and loader too?
Yes. Beyond the tractor, it has a dedicated Front Loader section for the LA340 and a Backhoe section for the BT603, each with mechanism and servicing coverage. p. 426
Does it give torque specs?
Yes. The manual lists wheel, mower blade, and hydraulic fitting torques so you can reassemble to factory values. Mower deck servicing and blade specs are in the mower section. p. 346
Is this a real workshop manual or an operator manual?
It is the full factory workshop manual, publication 9Y111-18062, with servicing procedures, torque values, and mechanism descriptions across 532 pages, not a basic operator guide.
Is this Kubota BX23S-AU & variants Workshop Manual a digital download?
Immediate download of the complete 532-page searchable Workshop Manual. Read it on any device: laptop at your desk or phone out in the field.
Am I able to print pages from this Kubota BX23S-AU & variants manual?
Yes, print as many copies as you want; there are no restrictions. Plenty of mechanics print just the section they need and carry it to the shop floor.
Can I find wiring schematics in this Kubota BX23S-AU & variants manual?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Kubota BX23S-AU & variants.
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