This Kubota M108S operator manual covers one machine and nothing else: 124 pages of operating procedures, scheduled maintenance, and the safety protocols Kubota wants followed before you leave the yard. The controls section walks through every lever, pedal, and dash indicator, including PTO speed monitoring, the Easy Checker display, and block heater startup for cold mornings. Periodic service fills 31 pages, from daily walk-arounds out to 4-year hose replacements, with an interval table marking the 50, 100, 200, 500, and 1,000-hour services. Hydraulic functional diagrams and control descriptions are included. Wheel bolt torque runs 260 to 303 N-m on standard positions, and the manual lists a 12V battery at 900 CCA for cold-season cranking. No more chasing specs across forum threads. Bookmarked, keyword-searchable, and ready on any device at the machine.
What's Inside This Kubota M108S Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| 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 |
| 3-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
Kubota M108S cranks slowly or clicks but engine will not start after sitting in cold weather p. 118
Inspect the battery cables for corrosion, then confirm the voltage holds at 12V or better. Pull the 5A starter relay fuse in the main panel (page 118) and check it. If the battery fails a standard load test, replace it.
Manual Section: Periodic ServiceTractor struggles to move forward in gear and brake pedals feel unusually tight or binding p. 102
Measure the brake pedal free travel with a ruler. Adjust the linkage rods until clearance falls between 7 and 14 mm, per page 102. Drain and refill the transmission fluid every 1000 Hr to keep engagement clean.
Manual Section: Periodic ServiceLoud whining noise from rear when lifting heavy implements and bucket drops under load p. 23
Check the hydraulic fluid level at the sight glass before you lift anything. Watch for system pressure of 19.6 MPa under load. A slow-lifting implement usually means the pump isn't making its full 65 L/min (page 23).
Manual Section: SpecificationsEngine stalls, idles abnormally, or loses power when operating under heavy load p. 86
Drain the water separator every day so debris never reaches the injectors. Swap the main fuel filter at each 500 Hr interval, per the schedule on page 86. If the 175 L tank ran dry, bleed the fuel system before restarting.
Manual Section: MaintenanceFrequently Asked Questions
What does Kubota M108S engine warning light mean?
Each Easy Checker(TM) lamp flags a different fault. The oil pressure lamp means engine oil pressure has dropped below the prescribed level; if it stays lit above 1000 rpm, check your oil level. The charge lamp means the alternator isn't charging the battery, so inspect the charging system or call your local KUBOTA Dealer.
What are the replacement specifications for battery?
For a replacement, fit a GP31 (105E41R) battery: 12 Volts, 85.3 A.H capacity at 5H.R, 160 minutes of reserve capacity, and 900 cold cranking amps (CCA). The normal charging rate is 11 A.
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 Kubota M108S manual?
Yes. The PDF carries no DRM, so print any page or section your shop needs. It works with any standard printer.
Are there hydraulic schematics in this Kubota M108S manual?
Yes. You'll find hydraulic functional diagrams, control descriptions, and component specifications with pressure ratings inside.
Document Quality
This document is a scanned PDF, meaning the text is not natively selectable or searchable. However, an OCR layer has been applied, allowing you to search the full text and copy content. The text quality is generally crisp and easy to read throughout the manual, without noticeable blurriness or fading. Diagrams and illustrations are raster images, but they are clear, and all labels are perfectly readable. The pages are clean with no significant scan artifacts, stains, marks, or skewed content. There are no notable blank or filler pages in the document.
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