Overview
The Kubota RTV-X900 and RTV-X1120D Utility Vehicle Workshop Service Manual provides technical information for maintenance, inspection, fault diagnosis and component repair of these Kubota utility vehicles. The documentation covers vehicle identification, safety, service intervals, engine systems, hydrostatic transmission (HST), rear and front axles, brakes, steering, hydraulics and electrical equipment. Separate specifications and servicing references identify the D902 engine used in the RTV-X900 and the D1105 engine used in the RTV-X1120D.
The workshop chapters distinguish system mechanisms from inspection and repair procedures. Topics include HST oil flow and control linkages, engine and transmission separation, cylinder head and crankshaft servicing, front limited-slip differential operation, hydraulic lift controls, electrical diagrams and fault diagnosis. The General section also provides tightening torques, model-specific service tools, tyre information, cargo-bed references and scheduled maintenance. A separate operating manual is listed with the product; consult What’s Included for that document’s stated model coverage and page count.
Safety: Review the Safety First instructions, safety decals and general service precautions before working on the vehicle. Follow the documented electrical-handling procedures and the applicable tightening, disassembly and adjustment instructions for the system being serviced.
Important Information: Engine specifications and repair instructions differ between the RTV-X900 (D902) and RTV-X1120D (D1105). The manual also provides separate HST oil-flow diagrams and certain model-specific electrical and hydraulic references. Select the information for the correct vehicle before carrying out a procedure.
Table of Contents
Kubota RTV-X900, RTV-X1120D Manual
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01. Information and Safety
- Safety First and Safety Decals
- Vehicle Specifications
- Travelling Speed Specifications
- Vehicle Dimensions
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02. General Information and Maintenance
- Product Identification and General Workshop Precautions
- Electrical Wiring, Battery, Fuse and Connector Handling
- Circuit Tester Precautions and Wiring Colour Identification
- Lubricants, Fuel and Coolant Requirements
- General Fastener, Stud Bolt and Plug Tightening Torques
- Hydraulic Hose, Pipe Fitting and Adaptor Tightening Torques
- Metric and UNC/UNF Fastener Specifications
- Maintenance Checklist and Daily Inspections
- Initial 50-Hour Service and Periodic 50-, 100- and 200-Hour Checks
- Periodic 300-, 400-, 500- and 800-Hour Checks
- 1,500- and 3,000-Hour Maintenance
- Annual, Two-Year and Four-Year Maintenance
- Additional Service Checks as Required
- Engine Special Tools — D902 and D1105
- Machine-Specific Workshop Tools
- Tyre Types, Inflation Pressure and Vehicle Limitations
- Cargo Bed and Shock Absorber References
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03. Engine — Mechanism and Servicing
- RTV-X900 D902 Engine — Head Cover, Closed Breather, Piston and Oil Pan
- RTV-X1120D D1105 Engine — Closed Breather and Governor
- Engine Lubricating, Cooling and Fuel Systems
- Engine Troubleshooting — RTV-X900 and RTV-X1120D
- Engine Body, Lubrication, Cooling and Fuel Service Specifications
- Engine Tightening Torques — Model-Specific References
- Engine Body and Lubrication System Checks and Adjustments
- Cooling and Fuel System Checks and Adjustments
- Dismounting the Engine and Transmission
- Separating the Engine from the Transmission
- D902 Cylinder Head, Valves and Oil Pan Disassembly/Assembly
- D902 Gear Case, Timing Gears, Pistons and Connecting Rods
- D902 Flywheel and Crankshaft Disassembly/Assembly
- D1105 Cylinder Head and Valve Disassembly/Assembly
- D1105 Gear Case, Timing Gears, Pistons and Connecting Rods
- D1105 Flywheel and Crankshaft Disassembly/Assembly
- Cylinder Head, Valve and Timing Gear Servicing
- D1105 Camshaft and Governor Gear Servicing
- Piston, Connecting Rod, Crankshaft and Cylinder Servicing
- Engine Oil Pump Servicing
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04. Transmission and Hydrostatic Drive (HST)
- Transmission Structures — RTV-X900 and RTV-X1120D
- Hydrostatic Transmission Construction and Power Train
- HST Oil Flow — RTV-X900
- HST Oil Flow — RTV-X1120D
- HST Component Functions and Operating Principles
- HST Control Linkage and Cables
- Range Gear Shift and Front-Wheel-Drive Sections
- HST, Travelling Gear Shift and Differential Troubleshooting
- Transmission Service Specifications and Tightening Torques
- Transmission Checking and Adjustment
- Separating the Hydraulic Transmission
- Engine and Transmission Removal and Separation
- Removing the HST Assembly
- Transmission and HST Disassembly/Assembly
- Transmission and Hydrostatic Unit Servicing
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05. Rear Axle
- Rear Axle Structure and Operating Mechanism
- Rear Axle Troubleshooting and Tightening Torques
- Rear Axle Checking and Adjustment
- Rear Knuckle Case Removal and Preparation
- Rear Shock Absorber Removal and Preparation
- Rear Knuckle Case Disassembly/Assembly and Servicing
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06. Service Brakes and Parking Brake
- Brake System Construction and Operation
- Front Brake Knuckle and Rear Brake
- Brake Master Cylinder and Brake Fluid
- Parking Brake Mechanism
- Brake Troubleshooting, Service Specifications and Tightening Torques
- Brake Checking and Adjustment
- Front Brake and Master Cylinder Removal
- Front Brake and Master Cylinder Disassembly/Assembly
- Rear Brake Disassembly/Assembly
- Front Brake, Rear Brake and Brake Piston Servicing
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07. Front Axle and Limited-Slip Differential
- Front Axle and Front Suspension Structure
- Limited-Slip Differential (LSD) Construction and Operation
- Front Axle Troubleshooting and Service Specifications
- Front Axle Tightening Torques and Adjustments
- Front Knuckle Case Removal and Preparation
- Front Differential Case Removal and Preparation
- Front Shock Absorber Removal and Preparation
- Knuckle Case, Front Differential and Shock Absorber Disassembly/Assembly
- Front Axle Component Servicing
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08. Power Steering System
- Steering Structures — RTV-X900 and RTV-X1120D
- Power Steering Hydraulic Circuit
- Steering Controller and Hydraulic Steering Cylinder
- Steering Troubleshooting and Service Specifications
- Steering Tightening Torques, Checks and Adjustments
- Power Steering Controller Removal
- Steering Cylinder and Power Steering Hose Removal
- Power Steering Cylinder Disassembly and Assembly
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09. Hydraulic System and Cargo-Bed Lift
- Hydraulic System Structures — RTV-X900 and RTV-X1120D
- Model-Specific Hydraulic Circuit Diagrams
- Hydraulic Pump and Lift Cylinder Construction
- Double-Acting Control Valve and Float/Detent Function
- Hydraulic System Troubleshooting and Service Specifications
- Hydraulic Tightening Torques and Adjustments
- Hydraulic Control Valve, Pump and Cylinder Checks
- Hydraulic Pump and Lift Cylinder Removal
- Hydraulic Pump Disassembly and Assembly
- Lift Cylinder and Control Valve Disassembly/Assembly
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10. Electrical System and Diagnostics
- Wiring Diagrams — RTV-X900 and RTV-X1120D
- Electrical Circuits and Model-Specific Starting Systems
- Starter Motor, Overrunning Clutch and Magnetic Switch
- Glow Plugs, Neutral Safety Switch and Engine Stop Solenoid
- RTV-X900 Engine Stop Solenoid Timer Relay
- Charging System — Alternator and IC Regulator
- Model-Specific Lighting Circuits
- Electrical Cooling Fan Motor and Radiator Fan Switch
- Fuel Quantity, Coolant Temperature and Travelling Speed Sensors
- Meter Panel, Easy Checker and Error Code Display
- Electrical Troubleshooting, Specifications and Tightening Torques
- Battery, Key Switch, Starter and Glow Plug Checks
- Neutral Safety Switch and Engine Stop Solenoid Testing
- Charging, Lighting and Cooling Electrical Circuit Tests
- Gauge, Relay and Sensor Checks
- Starter Motor Disassembly, Assembly and Servicing
- Alternator Disassembly, Assembly and Servicing
D902 and D1105 Engine Differences and HST Service References
The engine chapter identifies the RTV-X900 with the D902 engine and the RTV-X1120D with the D1105 engine. Although both have references for engine-body, lubrication, cooling and fuel-system servicing, their specifications, tightening data and disassembly sequences are presented separately. The D1105 references also identify camshaft and governor gear servicing, while the D902 section includes oil-pan work within its engine disassembly coverage.
The transmission chapter provides separate hydrostatic oil-flow information for the two vehicles, alongside HST adjustment, removal and repair procedures. The General section includes maintenance intervals, cargo-bed information and special tools, while the hydraulic and electrical chapters distinguish model-specific circuits. For radiator-hose inspections and other scheduled maintenance, use the documented access, inspection and service requirements rather than assuming the two vehicle configurations are identical.
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