Factory-written for the 2013-2021 RTV-X900 and RTV-X1120D, this OEM workshop manual (#9Y111-26171) keeps the machine running to spec across 488 pages. Separate wiring diagrams cover the X900 and X1120D, and the hydraulic schematics map the lift cylinder, steering circuit, and pump. Six pages of troubleshooting span the transmission, rear axle, front axle, and brakes. Exploded views walk through engine teardown on both the D902 and D1105 motors, while system diagrams trace every circuit from the HST to the limited slip differential. Torque the M10 metric fasteners to 39 to 44 N·m and confirm the X900 fuel capacity at 7.9 L before startup. Every hour the machine sits idle costs money, so get the factory answer on the first try. Bookmarked by section and keyword-searchable, it opens on any device and takes you straight to the procedure.
What's Inside This Kubota RTV-X900, RTV-X1120D Manual
| System | Pages | Key Topics |
|---|---|---|
| Record of Revisions | 3 | Code Number of This WSM Has Been Changed From 9Y121-09469 to 9Y121-26170, Added 200 Hrs or 3000 Km Maintenance Item; Suspension Arm Bushings |
| Information | 4-19 | - |
| General | 20-101 | Product Identification (Wiring, Battery, Fuse, Connector, Color of Wiring), Lubricants |
| Engine | 102-210 | Engine Body (Rtv-X900, Half-Floating Head Cover, Closed Breather, Piston, Oil Pan, Rtv-X1120D, Governor), Lubricating System, Cooling System, Fuel System |
| Transmission | 211-300 | Checking Charge Relief Pressure, Checking Neutral, Checking Travelling Speed, Checking Engine Cable, Checking Speed Control Pedal Stroke, Checking Range Gear Shift Lever Position, Checking Four Wheel Drive Lever Position, Checking Differential Lock Cable |
| Rear Axle | 301-311 | Adjusting Rear Shock Absorber, Preparation, Rear Wheel, Rear Knuckle Case, Checking Shock Absorber |
| Brakes | 312-338 | Knuckle, Rear Brake, Master Cylinder, Brake Oil, Parking Brake |
| Front Axle | 339-368 | Structure, Front Suspension, Limited Slip Differential (Structure, Operation), Troubleshooting, Servicing Specifications, Tightening Torques |
| Steering | 369-402 | Structure (Rtv-X900, Rtv-X1120D), Hydraulic Circuit, Steering Controller, Steering Cylinder |
| Hydraulic System | 403-424 | Structure (Rtv-X900, Rtv-X1120D), Hydraulic Circuit (Rtv-X900, Hydraulic Pump, Hydraulic Lift Cylinder |
| Electrical System | 425-488 | Wiring Diagram (Rtv-X900, Rtv-X1120D), Electrical Circuit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Tightening Torques (Metric Screws, Bolts and Nuts - Ordinary, M6) | 9.8 to 11.2 N·m | p. 38 |
| Tightening Torques (Metric Screws, Bolts and Nuts - Ordinary, M10) | 39 to 44 N·m | p. 38 |
| Engine start system check | every 50 hours / 1 year | p. 39 |
| Greasing | every 50 hours | p. 39 |
| Valve Clearance (Cold) | 0.145 to 0.185 mm | p. 119 |
| Engine Oil Pressure (Allowable Limit) | 147 kPa | p. 122 |
| Injection Nozzle Injection Pressure | 13.73 to 14.70 MPa | p. 123 |
| RTV-X900 | ||
| Fuel Capacity | 7.9 L | p. 30 |
| Engine Compression Pressure | 3.53 to 4.02 MPa | p. 119 |
| Transmission Charge Relief Valve Setting Pressure | 0.43 to 0.83 MPa | p. 256 |
| RTV-X1120D | ||
| Fuel Capacity | 6.4 L | p. 30 |
| Engine Compression Pressure | 3.73 to 4.11 MPa | p. 124 |
Kubota RTV-X900, RTV-X1120D Common Problems This Manual Covers
Kubota RTV-X900 engine won't start or turns over slowly in cold morning conditions
Test each glow plug for resistance; spec is roughly 0.9 Ω (page 455). Replace any plug that reads open or runs well above that value. Confirm the glow relay closes when the preheat indicator lights. If the plugs check out, move to fuel delivery: look for air in the injection lines and make sure the fuel filter is not blocked before cranking again.
Manual Section: EngineEngine temperature climbs into the red at normal working load, coolant loss observed
Inspect the coolant level first; system capacity is 6.1 L with the reserve tank included. Blow the radiator fins clean with compressed air, working from the engine side outward. Pressure-test the radiator cap and check that the thermostat opens fully. Coolant needs replacing every 2000 hours or 2 years (page 41); once it degrades, it loses corrosion inhibitors and scales up the internal passages.
Manual Section: EngineHydrostatic transmission slips or vehicle won't move when the drive pedal is pressed
Confirm the transmission fluid level; case capacity is 7.0 L (page 30). Low charge pressure starves the hydrostatic circuit and causes the slip. Measure charge relief valve pressure at the transmission test port: the RTV-X900 spec is 0.43 to 0.83 MPa, the RTV-X1120D is 0.48 to 0.90 MPa (page 256). If pressure falls short, inspect the charge pump and relief valve for wear or contamination.
Manual Section: TransmissionBrake pedal travels to the floor or requires excessive force before slowing begins p. 331
Adjust brake pedal free travel to 8 to 18 mm (page 332). If the pedal still feels spongy afterward, bleed the system to purge air; brake fluid capacity is 0.4 L. Inspect the master cylinder bore and piston for internal bypass. Recheck free travel every 50 hours (page 40); wear compounds fast when the adjustment is left alone.
Manual Section: BrakesDump bed or implement won't lift, rises slowly, or drops under load when stopped p. 414
Verify the hydraulic tank oil level; capacity is 18.0 L (page 30). Torque the hydraulic lift cylinder hose retaining nuts to 24.0 to 25.0 N·m (page 416); loose fittings let internal pressure bleed off. Check the hydraulic pump output and look for aeration in the fluid. Trace internal leakage paths with the hydraulic circuit schematic on page 407.
Manual Section: Hydraulic SystemFrequently Asked Questions
What are the recommended service intervals?
The manual's "Maintenance Check List" sets service intervals by component. The engine start system and greasing are both 50-hour checks, and the muffler is on the same 50-hour interval, while engine oil replacement is recommended every 200 hours.
What fluids and capacities does this machine require?
Fluids and capacities are spelled out by system. On the RTV-X900, the fuel tank holds 7.9 U.S.gals and the engine crankcase takes 3.3 U.S.gals with the filter exchanged, running API Service Classification SAE10W-30, SAE10W-40, SAE30, or SAE40. The hydraulic tank takes 19.0 U.S.qts of KUBOTA SUPER UDT, and the brakes use KUBOTA DOT3 GENUINE BRAKE FLUID.
How to troubleshoot engine won't start?
Start with the battery: a discharged or damaged one is a common culprit (page 8-S8). From there, check for a blown slow blow fuse (G-59) or a misadjusted safety switch (8-S12). Other suspects are a clogged fuel pipe (G-40), incorrect injection timing (1-S27), or a failing injection pump (1-S50).
What are the hydraulic system specifications?
The key figure here is the relief valve setting pressure: 12.5 to 13.5 MPa (128 to 137 kgf/cm², 1820 to 1950 psi), per factory spec. No allowable limit is given for this component.
What format is this Kubota RTV-X900, RTV-X1120D manual in?
Immediate download of the complete 488-page searchable Workshop Manual. Open it on any device, from a laptop at your desk to a phone in the field.
Is this Kubota RTV-X900, RTV-X1120D Workshop Manual printable?
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.
Does this Kubota RTV-X900, RTV-X1120D manual include wiring diagrams?
Yes. Full electrical schematics are included, with wire colors, connector locations, and circuit descriptions.
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