Kubota's M108S Low Profile tractor gets the full factory treatment here (OEM #9Y111-16183), one machine across 464 pages, from the Common Rail injection engine through the shuttle transmission, hydraulic circuit, and electrical harness. Hydraulic schematics trace the entire 3-point lift circuit and control valve oil flow; wiring diagrams map the main, engine, and bonnet harnesses; 21 pages of troubleshooting walk through the clutch, rear axle, brakes, front axle, and steering. Torque tables, clearance specs, and a time-based maintenance schedule running from 50-hour checks to 3,000-hour intervals put every number in front of you. Fill the transmission case to 60 L, hold engine oil pressure between 200 and 390 kPa at rated speed, and top off the 175 L fuel tank before a long day. With the dealer quoting a week of downtime, search any spec by keyword, bookmark your section, and get back to work.
What's Inside This Kubota M108S Low Profile Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 4-18 | Safety First, Safety Decals, Specifications, Traveling Speeds, Dimensions |
| General | 19-98 | Tractor Identification, Handling Precautions for Electrical Parts and Wiring (Battery, Fuse, Connector, Handling of Circuit Tester, Color of Wiring), Lubricants, Fuel and Coolant |
| Engine | 99-189 | Feature, Engine Body (Cylinder Block, Half-Floating Head Cover, Cylinder Head, Center Direct Injection System, Piston, Built-In Dynamic Balancer), Lubricating System (Oil Cooler) |
| Clutch | 190-203 | Mechanism, Traveling Clutch, Oil Flow, Servicing, Troubleshooting, Servicing Specification, Tightening Torques, Checking |
| Transmission | 204-298 | Structure, Shuttle Shift Mechanism (Shuttle Shift Section, Regulator Valve, Hydraulic Shuttle Valve) |
| Rear Axle | 299-310 | Mechanism, Structure, Servicing, Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing |
| Brakes | 311-332 | Mechanism, Feature, Servicing, Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing |
| Front Axle | 333-359 | Mechanism, Structure, Servicing, Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing |
| Steering | 360-376 | Mechanism, Structure, Servicing, Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling and Servicing |
| Hydraulic System | 377-409 | Mechanism, Structure, Hydraulic Circuit, Point Hydraulic System, Control Valve, Position Control, Servicing, Troubleshooting |
| Electrical System | 410-464 | Wiring Diagram (Main Harness, Engine Harness, Bonnet Harness) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel Tank Capacity | 175 L | p. 29 |
| Engine Crankcase Oil Capacity | 10.7 L | p. 29 |
| Engine Oil Capacity | 10.7 L | p. 15 |
| Transmission Case Capacity | 60 L | p. 15 |
| Engine Oil Pressure (At Rated Speed) | 200 to 390 kPa | p. 136 |
| Thermostat Valve Opening Temperature | 74.5 to 78.5 °C | p. 136 |
| Cylinder Head Surface Flatness | 0.05 mm | p. 132 |
| Clutch Pedal Free Travel | Below 15 mm | p. 196 |
| Brake Pedal Free Travel | 7 to 14 mm | p. 316 |
| Front Wheel Alignment Toe-in | 2.0 to 8.0 mm | p. 338 |
| Hydraulic Pump Delivery (3-Point Hitch) | 66.6 L/min. | p. 389 |
| Tire Pressure (Front 9.5-20, 6PR) | 200 kPa | p. 92 |
Kubota M108S Low Profile Common Problems This Manual Covers
Engine cranks slowly or won't fire on a cold morning
Start with the air heater circuit. Confirm battery voltage is adequate and the glow plug timer fires on cold mornings. Drain the fuel filter bowl to clear water contamination, then refill with fresh diesel from the 175 L tank. If it cranks but never fires, follow the no-start chart to isolate injection timing or compression loss.
Manual Section: Engine TroubleshootingThree-point hitch won't raise or raises too slowly at full engine speed p. 389
Begin with the transmission case fluid level; the system holds 60 L, and low fluid is the usual culprit. Confirm the position control linkage moves freely. Measure pump delivery at the test port: output should reach 66.6 L/min. (page 389). Anything below that points to a worn pump or clogged strainer. Trace the rest through Hydraulic System troubleshooting.
Manual Section: Hydraulic System TroubleshootingBrake pedals feel spongy or deliver uneven braking force side to side p. 316
Measure brake pedal free travel on both sides: spec is 7 to 14 mm (page 316). A spongy pedal usually means air in the lines, so bleed both circuits and confirm the 0.3 L total fluid capacity is met. Look at the brake discs for oil contamination from a leaking axle seal. Confirm the pedal locking mechanism engages before road travel.
Manual Section: Brakes TroubleshootingHard to shift gears or gears clash when changing speeds under load
Confirm the transmission case oil level; the system holds 60 L and needs changing every 1,000 hours (page 36). Check that clutch pedal free travel sits below 15 mm (page 196) before blaming internal synchro wear. Examine the shuttle shift linkage for worn parts or low hydraulic pressure. Gear clash usually traces back to a dragging clutch, not the transmission itself.
Manual Section: Transmission TroubleshootingSteering wheel requires excessive force or front wheels pull to one side p. 338
Set front wheel toe-in first: correct alignment runs 2.0 to 8.0 mm (page 338). Check power steering fluid level and bleed any air from the circuit. If steering stays heavy, test pressure at the steering valve; a fast oil temperature rise points to a stuck or worn spool. Work through Steering Troubleshooting for flow and pressure diagnosis.
Manual Section: Steering TroubleshootingEngine temperature gauge climbs into red zone during field work or long pulls
Clear the radiator and oil cooler of debris first. Check coolant level; the system holds 9.6 L. Confirm the thermostat opens at 74.5 to 78.5 °C (page 136); a stuck-closed unit is the usual cause. Make sure oil pressure at rated speed holds between 200 and 390 kPa. Use the Engine Troubleshooting chart for overheating diagnosis.
Manual Section: Engine TroubleshootingFrequently Asked Questions
What are the recommended service intervals?
The manual lays out service tasks by interval. Daily checks cover tire pressure and fluid levels (page 38). The initial 50-hour service includes an engine oil change (page 39). At every 100 hours, check the battery condition (page 42). Longer intervals add toe-in adjustment every 200 hours (page 48) and a new engine oil filter every 500 hours (page 49).
What fluids and capacities does this machine require?
Fuel is No. 2-D diesel, 175 L (46.2 U.S.gals). The cooling system takes 9.6 L (10.1 U.S.qts) of fresh clean water with anti-freeze, and the engine holds 10.7 L (11.3 U.S.qts) of API CF or CI-4 oil. The transmission case calls for KUBOTA UDT or KUBOTA SUPER UDT fluid, 60 L (63.4 U.S.qts).
How to troubleshoot engine won't start?
No-start usually traces to one of a few causes: no fuel (fill fuel, page G-8), air in the fuel system (vent air, page G-38), or a clogged fuel filter (replace, page G-28). On the electrical side, look at a discharged battery (charge, page 9-S10) or a failing starter (repair or replace, page 9-S16).
What are the hydraulic system specifications?
The three-point hitch pump delivers a factory-spec 66.6 L/min (17.6 U.S.gals/min), with an allowable limit of 53.2 L/min (14.1 U.S.gals/min). Relief valve setting pressure runs 19.1 to 19.6 MPa (195 to 200 kgf/cm²). Cylinder bore I.D. is specified at 100.036 to 100.071 mm (3.93843 to 3.93980 in.), with a 100.15 mm (3.9429 in.) allowable limit.
Is this Kubota M108S Low Profile Workshop Manual a digital download?
A 464-page Workshop Manual in searchable PDF, ready the moment you finish checkout. Open it on a computer, tablet, or phone. No shipping wait.
Can I print specific sections of this Kubota M108S Low Profile Workshop Manual?
None at all. The PDF is DRM-free, so print whatever sections you want to carry out to the shop. Standard letter or A4 paper works fine.
Does this Kubota M108S Low Profile Workshop Manual cover the hydraulic system?
Yes. It includes hydraulic system diagrams, circuit schematics, and component specifications for the M108S Low Profile.
Document Quality
This document is a scanned PDF, not a native digital file. An OCR layer has been applied, so you can search and copy the full text, though the text itself appears slightly pixelated rather than perfectly crisp. All diagrams and illustrations are raster images, which means they may show some pixelation when zoomed in, but labels are generally readable. The pages are clean with no notable scan artifacts, stains, or skewed content, and there are no blank or filler pages.
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