Overview
The Kubota BX1870, BX2370 and BX2670 Tractor Loader Workshop Service Manual provides technical documentation for maintenance, troubleshooting, inspection and component repair of these Kubota BX Series compact tractors. The workshop reference covers engine systems, hydrostatic transmission (HST), front axle, power steering, hydraulics, electrical equipment, rotary mowers and front loader attachments. Separate mechanism and servicing sections explain component construction, operating principles, technical specifications, checking, adjustment, disassembly and repair procedures.
The documentation includes model-specific engine service specifications, HST hydraulic oil-flow and control-linkage information, differential and PTO clutch servicing, steering relief-valve inspection, hydraulic pump testing and electrical fault diagnosis. Dedicated mower references cover seven RCK-series deck configurations, including power transmission, lifting mechanisms, self-balancing linkage, installation and adjustment. Front loader coverage includes the LA203A and LA243A attachments, with hydraulic circuit information, control valve construction, boom and bucket cylinder servicing, and loader mounting procedures. The General section provides maintenance schedules, tightening specifications and special tools for the tractor and applicable attachments.
Safety: The workshop documentation includes Safety First instructions and separate safety decals for the tractor, mower and front loader. Review the relevant safety information and component-specific precautions before servicing hydraulic systems, removing attachments or disassembling machine components.
Notice: Engine specifications and mower installation procedures differ between the covered configurations. The documentation identifies separate D722-E4, D902-E4 and D1005-E4 engine references, together with different RCK-series mower setup arrangements. Select the applicable technical information according to the machine, engine and attachment identification.
Table of Contents
Kubota BX1870, BX2370, BX2670 Manual
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01. Information, Safety and Specifications
- Safety First and General Workshop Safety Instructions
- BX Tractor Safety Decals
- Rotary Mower Safety Decals
- Front Loader Safety Decals
- BX Tractor Technical Specifications
- Mower Specifications — RCK48-18BX, RCK54-23BX and RCK60B-23BX
- Mower Specifications — RCK48P-18BX and RCK54P-23BX
- Mower Specifications — RCK54D-26BX and RCK60D-26BX
- Front Loader Technical Specifications
- Tractor Travelling Speeds
- Machine Dimensions
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02. General Information and Maintenance
- Tractor Identification, Serial Number and Hour Meter
- Engine Cylinder Identification
- Rotary Mower Identification
- Front Loader Identification
- General Workshop Precautions
- Electrical Wiring and Component Handling Precautions
- Battery, Fuse and Electrical Connector Handling
- Circuit Tester Precautions and Wiring Colour Identification
- Tractor Fuel, Engine Oil and Transmission Oil Requirements
- Rotary Mower Lubricant Requirements
- Front Loader Lubricant Requirements
- General Fastener and Stud Bolt Tightening Torques
- Metric and UNC/UNF Fastener Specifications
- Hydraulic Fitting, Adaptor and Elbow Tightening Torques
- Tractor Maintenance Checklist
- Rotary Mower Maintenance Checklist
- Front Loader Maintenance Checklist
- Daily Tractor Inspection and Maintenance
- Initial 50-Hour Tractor Maintenance
- Periodic Maintenance — Every 50 and 100 Hours
- Periodic Maintenance — Every 200 and 400 Hours
- 800-Hour Maintenance Checks
- 1,000-Hour or Annual Maintenance
- 1,500-Hour Maintenance Checks
- 2,000-Hour or Two-Year Maintenance
- 3,000-Hour Maintenance Checks
- Annual and Four-Year Maintenance Requirements
- Additional Tractor Inspection and Servicing
- Mower Daily and Each-Use Maintenance
- Mower Initial 50-Hour and 150-Hour Maintenance
- Annual and Four-Year Mower Maintenance
- Front Loader Daily Inspection and Maintenance
- Front Loader Maintenance — Every 10 Hours
- Special Service Tools for Engine Repair
- Special Service Tools for Tractor Components
- Special Service Tools for Front Loader Components
- Tyre Inflation Pressure and Wheel Tread
- Front and Rear Ballast Requirements
- Implement Limitations
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03. Engine — Mechanism and Servicing
- Engine Lubricating System Construction
- Engine Cooling System Construction
- Engine Fuel System Construction
- Engine Troubleshooting
- Engine Specifications — BX1870D (D722-E4)
- Engine Specifications — BX2370D (D902-E4)
- Engine Specifications — BX2670D (D1005-E4)
- Engine Tightening Torque Specifications
- Engine Body Checking and Adjustment
- Engine Lubricating System Inspection
- Cooling System Checking and Adjustment
- Fuel System Checking and Adjustment
- Engine Separation and Removal
- External Engine Component Removal
- Cylinder Head and Valve Disassembly and Assembly
- Engine Gear Case and Timing Gear Disassembly
- Piston and Connecting Rod Disassembly
- Flywheel and Crankshaft Disassembly
- Cylinder Head and Valve Inspection
- Timing Gear, Camshaft and Governor Gear Servicing
- Piston and Connecting Rod Inspection
- Crankshaft and Bearing Servicing
- Cylinder Inspection and Servicing
- Engine Oil Pump Servicing
- Engine Relief Valve Spring Inspection
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04. Transaxle and Hydrostatic Transmission (HST)
- Transaxle Construction and Operating Mechanism
- Hydrostatic Transmission Structure
- Hydrostatic Transmission Oil Flow
- HST Control Linkage
- HST Speed-Set Linkage
- Range Gear Shift Mechanism
- Front-Wheel-Drive Transmission Section
- Differential Gear Construction
- Differential Lock Mechanism
- Transaxle Brake System
- Power Take-Off (PTO) System
- PTO Clutch and Hydraulic Control Valve
- Mid-PTO and Rear-PTO Drive Sections
- Hydraulic Pump Drive Gear Mechanism
- Transaxle Troubleshooting
- Transaxle Servicing Specifications
- Transaxle Tightening Torques
- HST and Transaxle Checking and Adjustment
- Transaxle Separation and Removal
- Hydrostatic Transmission Disassembly and Assembly
- Hydraulic Cylinder Removal and Installation
- Transaxle Shaft Disassembly and Assembly
- Transaxle Shaft Reassembly
- Hydrostatic Transmission Component Servicing
- Transaxle Case Inspection and Servicing
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05. Front Axle — Mechanism and Servicing
- Front Axle Construction
- Front Wheel Alignment
- Front Axle Troubleshooting
- Front Axle Servicing Specifications
- Front Axle Tightening Torques
- Front Axle Checking and Adjustment
- Front Axle Separation and Removal
- Front Axle Assembly Disassembly and Reassembly
- Front Axle Component Inspection and Servicing
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06. Power Steering System
- Power Steering Hydraulic Circuit
- Steering Controller Construction
- Power Steering Cylinder
- Steering System Troubleshooting
- Steering Servicing Specifications
- Steering Tightening Torques
- Steering Relief Valve Inspection
- Power Steering Controller Removal
- Power Steering Cylinder Removal
- Steering Cylinder Disassembly and Assembly
- Steering Component Inspection and Servicing
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07. Hydraulic System and Loader Control Circuits
- Hydraulic System Circuit Diagram
- Hydraulic Pump Construction
- Main Hydraulic Control Valve
- Flow Priority Valve
- Hydraulic Relief Valve
- Hydraulic Lift Cylinder
- Hydraulic Block-Type Outlet
- Mower Lift Linkage Mechanism
- Front Loader Hydraulic Valve and Pipe Arrangement
- Front Loader Control Valve Construction
- Front Loader Hydraulic Circuit
- Loader Control Valve Operating Principles
- Hydraulic System Troubleshooting
- Hydraulic Servicing Specifications
- Hydraulic Tightening Torques
- Hydraulic Relief Valve Checking and Adjustment
- Hydraulic Pump and Flow Priority Valve Testing
- Mower Lift Linkage Checking and Adjustment
- Hydraulic Cylinder Block Removal
- Hydraulic Pump Removal
- Hydraulic Cylinder and Control Valve Disassembly
- Mower Lift Linkage Disassembly and Assembly
- Front Loader Control Valve Disassembly and Assembly
- Hydraulic Pump Component Inspection and Servicing
- Hydraulic Cylinder Inspection and Servicing
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08. Electrical System and Diagnostics
- Tractor Electrical Wiring Diagram
- Engine Starting System
- Main Switch Operating Positions
- Engine Starting Safety Switches
- Operator Presence Control (OPC) System
- Battery Charging System
- Charging Circuit and IC Regulator
- Tractor Lighting System
- Electrical Gauge Circuit
- Hour Meter and Tachometer
- Fuel Level Gauge and Sensor
- Coolant Temperature Gauge
- Accessory DC Power Outlet
- Electrical System Troubleshooting
- Electrical Servicing Specifications
- Electrical Tightening Torques
- Battery Inspection and Testing
- Main Switch Checking and Adjustment
- Starter Motor Inspection and Testing
- Glow Plug Testing
- Engine Starting Safety Switch Inspection
- Operator Presence Control Switch Testing
- Fuel Pump Electrical Checks
- Engine Stop Solenoid Inspection
- Timer Relay Testing
- Charging System Testing
- Combination Switch and Lighting Circuit Inspection
- Electrical Gauge and Sensor Testing
- DC Power Outlet Testing
- Instrument Panel Checking and Adjustment
- Starter Motor Disassembly and Assembly
- Alternator Disassembly and Assembly
- Starter Motor Component Servicing
- Alternator Component Inspection and Servicing
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09. Rotary Mower — Mechanism and Servicing
- Rotary Mower Power Transmission
- Mower Lifting Mechanism
- Mower Self-Balancer System
- Rotary Mower Troubleshooting
- Mower Servicing Specifications
- Mower Tightening Torques
- Mower Setup — RCK48-18BX, RCK54-23BX and RCK60B-23BX
- Mower Setup — RCK48P-18BX and RCK54P-23BX
- Mower Setup — RCK54D-26BX and RCK60D-26BX
- Mower Installation and Mounting Procedures
- Mower Linkage Checking and Adjustment
- Mower Cutting-Height Adjustment
- Mower Blade and Drive Belt Inspection
- Mower Component Disassembly and Assembly
- Mower Component Inspection and Servicing
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10. Front Loader — Mechanism and Servicing
- Front Loader Hydraulic Circuit Schematic
- Loader Hydraulic Control Valve Assembly
- Boom Cylinder and Bucket Cylinder Construction
- Front Loader Troubleshooting
- Loader Servicing Specifications
- Front Loader Tightening Torques
- Front Loader Removal from Tractor
- Front Loader Installation and Mounting
- Bucket, Boom and Hydraulic Cylinder Disassembly
- Loader Hydraulic Cylinder Inspection and Servicing
- Loader Side Frame Disassembly and Assembly
- Front Guard and Main Frame Removal
- Front Loader Component Servicing
Hydrostatic Drive, Mower Configuration and Loader Hydraulic Servicing
The engine specifications distinguish the D722-E4, D902-E4 and D1005-E4 configurations, while the transaxle chapter provides hydrostatic transmission construction, HST control linkage, differential and PTO clutch servicing references. When diagnosing drivetrain problems, the applicable engine information and transaxle specifications should be selected according to the machine configuration. Steering and hydraulic systems are documented separately, including relief-valve checking and hydraulic component servicing.
The mower documentation identifies two groups of RCK-series installation procedures, separating the RCK48/RCK54/RCK60B and RCK48P/RCK54P configurations from the RCK54D/RCK60D arrangements. The tractor hydraulic chapter covers mower lift linkage and front loader control-valve operation, while the dedicated Mower and Front Loader chapters provide attachment-specific installation, adjustment, disassembly and servicing information. These references should be matched to the installed attachment rather than treating every deck or loader configuration as interchangeable.
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