This is the operator's manual for the Kubota M108S tractor, powered by the V3800-DI-TI diesel engine. It runs 124 pages and covers the machine from front to back: starting and running the engine, operating the tractor, the PTO, three point hitch, hydraulic unit, tires and ballast, cab controls, and the full maintenance and periodic service schedule.
With it you can find the specifications you need, follow the correct service intervals, set tire pressures and wheel torque, and work through the built in troubleshooting for starting, power, and overheating problems. Whether you run the M108S daily or are bringing one back into service, it puts the factory procedures and settings in one place.
Delivered as a downloadable PDF you can read on a phone, tablet, or computer, or print the pages you need for the shop.
What's Inside This Kubota M108S Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety First | 11-20 | Careful Operation, Working Safely, Danger Warning and Caution Labels, First Aid Kit, Implement Lowering, Escaping Hydraulic Fluid Hazard |
| Servicing of Tractor | 21 | - |
| Specifications | 22-25 | Cold Weather Starting, Block Heater (if equipped), Stopping The Engine, Warming Up, Jump Starting, Operating New Tractor, Changing Lubricating Oil for New Tractors, Starting |
| Implement Limitations | 26-27 | Turn Signal / Hazard Light Switch, Horn Button, Brake Pedals (Right and Left) |
| Instrument Panel and Controls | 28-31 | Clutch Pedal, Main Gear Shift Lever, Range Gear Shift Lever, Hydraulic-Shuttle Shift Lever, Creep Lever (if equipped), Front Wheel Drive Lever |
| Pre-Operation Check | 32 | Hand Throttle Lever, Foot Throttle, Parking Brake Lever |
| Operating the Engine | 33-37 | Starting the Engine, Cold Weather Starting (Block Heater), Stopping the Engine, Warming Up (Warm-Up and Transmission Oil at Low Temperature Range), Jump Starting |
| Operating the Tractor | 38-55 | Operating New Tractor (Do Not Operate the Tractor at Full Speed for the First 50 Hours, Changing Lubricating Oil for New Tractors) |
| PTO | 56-57 | Changing Display Mode, PTO Speed Display Mode Switching, Entering the Travel Speed Coefficient |
| Point Hitch & Drawbar | 58-62 | Rear Wheels, Ballast, Front Ballast, Rear Ballast, Door And Window, Locking and Unlocking the Door, Opening the Door, Rear Window |
| Hydraulic Unit | 63-69 | Work Light, Work Light Switch, Front Work Light, Rear Work Light, Wiper, Front Wiper / Washer Switch, Rear Wiper / Washer Switch (if equipped), Using the Wipers in Cold Season |
| Tires, Wheels and Ballast | 70-74 | Tires (Inflation Pressure, Dual Tires), Wheel Adjustment (Front Wheels, Front Wheel Turning Stopper Bolt, Rear Wheels), Ballast (Front Ballast, Rear Ballast) |
| Cab Operation | 75-85 | Door and Window (Locking and Unlocking the Door, Opening the Door, Rear Window, Side Window), Dome Light, Work Light (Switch, Front Work Light, Rear Work Light) |
| Maintenance | 86-90 | Checking Battery Condition, Cleaning Air Cleaner Primary Element, Adjusting Fan Belt Tension, Adjusting Brake Pedal, Adjusting Parking Brake Lever, Every 200 Hours, Checking Oil Cooler Line, Adjusting Toe-in |
| Periodic Service | 91-121 | How to Open the Hood |
| Storage | 122 | Tractor Storage, Removing the Tractor From Storage, Bolts and Nuts, Grease Application, Tire Inflation, Engine Oil Change |
| Troubleshooting | 123 | Engine Starting Difficulty, Engine Power Insufficiency, Engine Sudden Stop, Exhaust Fumes Color, Engine Overheating |
| Options | 124 | Engine Block Heater, Double Acting Remote Hydraulic Control Valve, Flow Control Valve Kit, Front End Weights, Rear Wheel Weights, Creep Speed Kit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Wheel bolt torque (1), (2), (3) | 260 to 303 N-m (26.5 to 31.0 kgf-m) | p. 78 |
| Wheel bolt torque (4) | 343 to 401 N-m (35.0 to 41.0 kgf-m) | p. 78 |
| Battery capacity | 12V, RC: 160 min, CCA 900A | p. 22 |
| Battery Volts (V) | 12 | p. 81 |
| Starter relay fuse capacity | 5A | p. 118 |
| Meter backup fuse capacity | 5A | p. 118 |
| Flasher (Hazard) fuse capacity | 15A | p. 118 |
| Fuel filter replacement interval | every 500 Hr | p. 86 |
| Engine Oil Capacity (with filter) | 10.7 L | p. 22 |
| Fuel Tank Capacity | 175 L | p. 22 |
| Coolant Capacity | 9.6 L | p. 22 |
| Hydraulic Pump Capacity | 65 L/min | p. 23 |
Kubota M108S Common Problems This Manual Covers
Engine cranks but will not start
Owners report the M108S turning over but failing to fire, often traced to a starter interlock or safety switch, a relay or fuse, or a weak battery. The Troubleshooting section walks through engine starting difficulty step by step.
Manual Section: Troubleshooting p. 123Rough running or power loss
Sluggish acceleration or stumbling under load can come from the common rail fuel system, a restricted fuel supply, or an overdue fuel filter. Follow the fuel filter replacement interval in the Maintenance section to keep the supply clean.
Manual Section: Maintenance p. 86Clutch or transmission will not engage
Some owners find the tractor will not go into gear or the clutch takes up roughly. The Operating the Tractor section covers the clutch pedal, gear shift levers, and correct operating technique.
Manual Section: Operating the Tractor p. 38Weak starting in cold weather
In cold conditions the engine may crank slowly or be hard to start. The Operating the Engine section covers cold weather starting and the block heater option to get reliable starts.
Manual Section: Operating the Engine p. 33Blown fuses or electrical dropouts
Lights, gauges, or accessories that cut out intermittently usually point to a blown fuse or a loose connection. The Periodic Service section lists the fuse ratings and locations for the electrical system.
Manual Section: Periodic Service p. 91Loose wheel bolts or wrong tire pressure
Running the wrong tire pressure or letting wheel bolts loosen affects stability and traction. The Tires, Wheels and Ballast section gives the inflation pressures, wheel torque, and ballast setup.
Manual Section: Tires, Wheels and Ballast p. 70Frequently Asked Questions
Which tractor does this manual cover?
It is the operator's manual for the Kubota M108S tractor with the V3800-DI-TI diesel engine, 124 pages in English.
What is the engine oil capacity?
The M108S holds 10.7 L of engine oil with the filter. It is listed with the fuel and coolant capacities in the Specifications section. p. 22
What torque do the wheel bolts need?
The Tires, Wheels and Ballast section gives wheel bolt torque of 260 to 303 N-m for most positions and 343 to 401 N-m for the larger bolts. p. 70
How do I get the manual after buying?
It is an instant digital download. After purchase you receive the PDF to save and keep on your own device.
Is this Kubota M108S Operator Manual a digital download?
It's a 124-page searchable PDF, downloadable the moment checkout clears. Open it on a laptop, tablet, or phone and bring it straight to the shop floor.
Are there any print restrictions on this manual?
Yes. The PDF carries no DRM, so print any page or section your shop needs. It works with any standard printer.
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