Part of the Kubota Repair Manuals.
This is the Kubota Workshop Manual for the BX1870, BX2370, and BX2670 sub-compact tractors, the RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX, RCK54P-23BX, RCK54D-26BX, and RCK60D-26BX mower decks, and the LA203A and LA243A front loaders. The tractors run the D722-E4-BX-1, D902-E4-BX-1, and D1005-E4-BX-1 diesel engines.This 417 page English PDF is the service-level manual, organized into Information, General, and system chapters for the engine, transaxle, front axle, steering, hydraulics, electrical, mower, and front loader. Each chapter gives mechanism, checking, disassembly, servicing specifications, and tightening torques.Independent mechanics and serious owners can use it to diagnose faults, rebuild components, set relief pressures, and torque fasteners to spec across the whole machine. Download it, keep it on the bench, and print the sections you need.
What's Inside This Kubota BX1870–BX2670 Package Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | - | - |
| G General | - | Identification (Tractor Identification, Mower Identification, Front Loader Identification) |
| Engine | - | Lubricating System, Cooling System, Fuel System, Checking |
| Transaxle | - | Traveling System (Hydrostatic Transmission, Range Gear Shift Section, Front Wheel Drive Section, Differential Gear Section, Brake Section) |
| Front Axle | - | Front Wheel Alignment, Structure, Checking |
| Steering | - | Steering Controller, Steering Cylinder, Hydraulic Circuit, Checking |
| Hydraulic System | - | 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), Charging System (Electrical Circuit, Ic Regulator), Lighting System |
| Mower | - | Power Transmission, Lifting Mechanism, Self-Balancer System, Setting Up Mower (Rck48-18Bx, Rck54-23Bx, Rck60B-23Bx, Rck48P-18Bx, And Rck54P-23Bx, Rck54D-26Bx, Rck60D-26Bx) |
| Front Loader | - | Hydraulic Circuit Schematic, Control Valve Assembly, Boom Cylinder and Bucket Cylinder |
Every system also includes tightening torques, disassembling and servicing, servicing specifications, and troubleshooting.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| BX1870D, BX2370D, BX2670D | ||
| Front wheel mounting screws torque | 149.2 to 179.0 N·m (15.2 to 18.3 kgf·m, 110 to 132 lbf·ft) | p. 54 |
| Rear wheel mounting screws torque | 108.5 to 130.2 N·m (11.1 to 13.3 kgf·m, 80 to 96 lbf·ft) | p. 54 |
| RCK48-18BX | ||
| Mower link clearance (between stopper and rear link) | 0 to 0.5 mm (0 to 0.01 in.) | p. 385 |
| RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX, RCK54P-23BX | ||
| Anti-scalp rollers to ground clearance | 6 to 13 mm (0.25 to 0.5 in.) | p. 386 |
| RCK54D-26BX | ||
| Mower blade screw torque | 103 to 117 N·m (10.5 to 12.0 kgf·m, 76.0 to 86.7 lbf·ft) | p. 375 |
| Gear box mounting screw torque | 78 to 90 N·m (7.9 to 9.2 kgf·m, 58 to 66 lbf·ft) | p. 375 |
| All Models | ||
| Relief valve setting pressure (Oil temperature at 45 to 55 °C (113 to 131 °F)) | 12.3 to 12.7 MPa (125 to 130 kgf/cm², 1780 to 1840 psi) | p. 303 |
| Air cleaner element replacement interval | Every 1000 hours or every 1 year whichever comes first | p. 57 |
| Engine oil filter replacement interval | every 200 Hr | p. 46 |
| Transmission oil filter replacement interval | every 200 Hr | p. 46 |
| Fuel filter element replacement interval | every 400 Hr | p. 46 |
| Radiator screen cleaning interval | Daily | p. 49 |
Kubota BX1870–BX2670 Package Common Problems This Manual Covers
Overheating under load while mowing
A radiator screen packed with debris, low coolant, or a worn fan belt causes overheating on the BX tractors. The engine chapter covers the cooling system and its checks.
Manual Section: 1 Engine p. 100Weak hydraulic or loader performance
Low fluid, a clogged hydraulic filter, trapped air, or pump and valve wear reduce hydraulic power. The hydraulic chapter covers the pump, control valve, and relief valve.
Manual Section: 5 Hydraulic System p. 276No-start or hard starting
A drained battery, corroded terminals, a blown fuse, or a failing safety switch prevents starting. The electrical chapter covers the starting and charging systems and the safety switches.
Manual Section: 6 Electrical System p. 319Engine runs rough after mowing a while
Fuel delivery restriction or a tank venting issue can starve the BX2670 after some run time. The engine chapter covers the fuel system and its checking procedures.
Manual Section: 1 Engine p. 100Hydraulic oil leaks at fittings
Worn O-rings, loose fittings, and cracked hoses leak at hydraulic service points. The hydraulic chapter covers the cylinders and circuit so you can find and cure the leak.
Manual Section: 5 Hydraulic System p. 276Uneven mower cut or blade vibration
Worn blades, loose hardware, or a mis-set deck cause vibration and a poor cut. The mower chapter covers power transmission, deck setup, and blade screw torque.
Manual Section: 7 Mower p. 367Loader boom drifts or lifts unevenly
Worn cylinder seals or a control valve fault let the loader boom drift down or lift unevenly. The front loader chapter covers the control valve and the boom and bucket cylinders.
Manual Section: 8 Front Loader p. 401Frequently Asked Questions
Which machines and engines does this manual cover?
The BX1870, BX2370, and BX2670 tractors, the RCK48, RCK54, and RCK60 series mower decks, and the LA203A and LA243A loaders, with the D722-E4-BX-1, D902-E4-BX-1, and D1005-E4-BX-1 engines.
Is this a full service manual or just an owner guide?
It is a workshop (service) manual, with mechanism, disassembly, servicing specifications, and tightening torques for every system rather than basic operating instructions.
Does it list torque and hydraulic pressure specs?
Yes, including wheel and mower blade torque values and the hydraulic relief valve setting pressure. See the hydraulic chapter for the relief pressures. p. 276
Are wiring diagrams included?
Yes. The electrical chapter provides the wiring diagram along with the starting, charging, and lighting systems. p. 319
What format is this manual in?
It is an instant PDF download. The full 417-page searchable Workshop Manual is yours the moment payment clears, ready to open on a laptop, tablet, or phone right in the shop.
Am I able to print pages from 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 hydraulic system diagrams in this Kubota BX1870 & variants Workshop Manual?
Yes, this Kubota BX1870 & variants Workshop Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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