Part of the Kubota Repair Manuals.
This Kubota R320S and R320S(B) workshop manual is the factory service documentation for these wheel loaders, powered by the V1305-E3-RP diesel engine. It runs 381 pages and is organized into General, Mechanism, and Service sections covering the machine from identification and torque tables through full component overhaul.Coverage spans the engine, hydraulic system, power train, brakes, steering, front loader, frame, electrical system, and the backhoe on the R320S(B). You get hydraulic and steering circuit diagrams, LST pump and motor specifications, brake performance measurements, wiring diagrams, and dedicated troubleshooting for the hydraulic, brake, steering, and front loader systems.Owners, independent mechanics, and restorers can use it to diagnose weak forward or reverse drive, restore loader lift and curl performance, bleed and adjust the brakes, service the steering controller and cylinder, or repair the backhoe circuit. It is a downloadable PDF you can search on any device or print by the page.
What's Inside This Kubota R320S, R320S(B) Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | 5-20 | Safety First, Work Safety, Safety Decals, Table of Main Specifications, Dimensions |
| G General | 21-41 | Machine Indentification, Engine Indentification, General Precautions, Handling Precautions for Electrical Parts and Wiring, Types of Oil, Tightening Torques |
| Engine | 42-126 | Troubleshooting, Service Standard, Tightening Torques, Disassembly, Reassembly and Maintenance, Radiator, Accelerator |
| Hydraulic System | 127-186 | Hydraulic Circuit, Hydraulic Equipment Schematic, Oil Flow, Lst Pump Specifications, Lst Motor Specifications |
| Power Train | 187-207 | Drivetrain, Transmission, Front Axle and Rear Axle Differential Cases |
| Brakes | 208-230 | Brake System, Brake Components, Master Cylinder, Negative Brake, Brake Line Air Bleeding Procedure, Brake Performance Measurements |
| Steering | 231-266 | Steering System, Steering Controller Specifications, Steering Cylinder Specifications, Steering Wheel Unit, Steering Controller, Steering Cylinder |
| Front Loader | 267-297 | Front, Implement Control Lever, Control Valve, Measuring Front Performance, Troubleshooting (Front) |
| Frame | 298-307 | Center Pin Removal and Installation, Measuring the Center Pin and Bushing, Canopy Assembly, Weight Assembly |
| Electrical System | 308-338 | Electrical Device Layout, Electrical Wiring, Inspections, Circuit Diagram, Electrical Wiring Diagram |
| Backhoe | 339-381 | Oil Flow, Diagram of Hydraulic Circuit, Control Valve Specifications, Hydraulic Cylinder Specifications, Backhoe Operation Schematic, Routing of Hydraulic Hoses |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| General Use Screws, Bolts and Nuts (M6, No-grade or 4T) | 7.9 to 9.3 N·m (0.80 to 0.95 kgf·m, 5.8 to 6.8 lbf·ft) | p. 34 |
| General Use Screws, Bolts and Nuts (M10, 7T) | 49 to 55 N·m (5.0 to 5.7 kgf·m, 37 to 41 lbf·ft) | p. 34 |
| Operating weight (with Rops/Fops) | 2220 kg | p. 16 |
| Horsepower (SAE gross) | 18.5 kW | p. 16 |
| Engine Valve clearance | 0.145 to 0.185 mm | p. 44 |
| Engine Compression (Factory Specification) | 3.72 to 4.12 MPa | p. 56 |
| M10 Bolt Torque (No-grade or 4T) | 40 to 45 N·m | p. 61 |
| Cylinder head screw torque | 63.7 to 68.6 N·m | p. 62 |
| LST pump capacity | 26 cc/rev | p. 133 |
| Steering controller displacement volume | 100 cc/rev | p. 235 |
| R320S | ||
| Overall length | 3575 mm | p. 16 |
| R320S(B) | ||
| Overall length | 3835 mm | p. 16 |
Kubota R320S, R320S(B) Common Problems This Manual Covers
Weak or no forward and reverse drive
Loss of travel power, especially under load, is a common wheel loader complaint tied to hydrostatic drive pressure problems such as relief valve wear or internal leakage. The hydraulic section covers the circuit, oil flow, and pressure testing needed to isolate it.
Manual Section: 2 Hydraulic System p. 127Loader lift slow or loses power
Loader functions that move slowly, hesitate, or fade after warm-up usually trace to low oil, a worn pump, or a leaking relief valve. The front loader section includes performance measurement and troubleshooting steps.
Manual Section: 6 Front Loader p. 267Machine will not travel straight
Traveling in only one direction or a directional imbalance points to a drive circuit fault rather than routine maintenance. The power train section covers the drivetrain, transmission, and axle differentials.
Manual Section: 3 Power Train p. 187Overheating or lost hydraulic performance
Repeated overheating and general loss of hydraulic performance often come from contaminated fluid, restricted flow, or a failing engine cooling component. The engine section covers the radiator and related service.
Manual Section: 1 Engine p. 42Hard or wandering steering
Heavy effort or poor return usually points to the steering controller or cylinder. The steering section lists controller and cylinder specifications and gives the disassembly and troubleshooting procedures.
Manual Section: 5 Steering p. 231Weak brakes or spongy pedal
Reduced braking or a soft pedal is often trapped air, a worn master cylinder, or a negative brake fault. The brakes section covers the components, the air bleeding procedure, and brake performance measurements.
Manual Section: 4 Brakes p. 208Frequently Asked Questions
Which machines does this manual cover?
It covers the Kubota R320S and R320S(B) wheel loaders, both fitted with the V1305-E3-RP diesel engine. The R320S(B) adds backhoe coverage in a dedicated section.
How do I test the hydraulic and hydrostat drive circuit?
The hydraulic system section covers the hydraulic circuit, equipment schematic, oil flow, and LST pump and motor specifications, with measurement of hydraulic device performance to check pressures. p. 127
Does it explain how to bleed the brakes?
Yes. The brakes section includes the brake line air bleeding procedure, master cylinder and negative brake service, and brake performance measurements for setting the system correctly. p. 208
How is the manual delivered?
It is an instant digital download. You get the PDF right after checkout and keep your own copy, with no shipping or waiting.
How quickly can I access this manual after buying?
Checkout triggers an instant download of the full 381-page searchable PDF. Open it on a laptop, tablet, or phone and take it straight to the shop floor.
Are there any print restrictions on this Kubota R320S manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this Kubota R320S manual include hydraulic schematics?
Yes, this Kubota R320S, R320S(B) Workshop Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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