Kubota's M90, M110, and M120 share this 661-page factory workshop manual (OEM #97897-12940), organized to get a down tractor back to spec fast. Wiring diagrams map the full electrical system; hydraulic schematics trace the three-point hitch circuit, power steering, and PTO clutch oil flow. Torque tables and 150 pages of step-by-step procedures cover the engine, transmission, brakes, front axle, steering, and cab. Troubleshooting charts work through power shift faults, charging system failures, and hydraulic performance issues, while exploded views run every disassembly sequence from cylinder head to rear axle. Fill the M-90 crankcase to 16.3 L and its transmission to 55 L; the M-110 and M-120 take 20.8 L of engine oil and 58 L in the transmission case. No more piecing specs together from forum threads. Bookmarked by section and keyword-searchable, so you can open it on a tablet at the machine and start wrenching.
What's Inside This Kubota M90, M110, M120 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Instructions | 3-9 | Safety First, Before Servicing And Repairing, Safety Starting, Safety Working, Avoid Fires, Ventilate Work Area, Prevent Acid Burns, Dispose Of Fluids Properly |
| Dimensions | 13 | Overall Height, Overall Length, Wheel Base |
| General | 14-80 | Features, Tractor Identification, Handling Precautions For Electrical Parts And Wiring (Battery, Fuse, Connector, Handling Of Circuit Tester), Lubricants, Fuel And Cooling Water |
| Engine | 81-106 | Features |
| Engine (M-90) | 107-166 | Troubleshooting, Servicing Specifications, Tightening Torques, Checking |
| Engine (M-110 M-120) | 167-224 | Troubleshooting, Servicing Specifications, Tightening Torques, Checking |
| Clutch | 225-250 | Travelling Clutch (Features), Pto Clutch (Structure, Oil Flow, Valve, Shift Linkage), Troubleshooting, Servicing Specifications, Tightening Torques, Checking |
| Rear Axle | 357-367 | Features, Final Reduction System, Troubleshooting, Servicing Specifications, Tightening Torques, Checking, Disassembling And Servicing (Disassembling And Assembling) |
| Brakes | 368-391 | Features, Travelling Brake (Operation, Brake Body, Master Cylinder, Equalizer, Brake Oil), Parking Brake, Troubleshooting, Servicing Specifications, Tightening Torques, Checking |
| Front Axle | 392-431 | Structure (Wheel Drive Type), Front Wheel Alignment, Troubleshooting, Servicing Specifications, Tightening Torques, Checking |
| Steering | 432-461 | Features, Power Steering Hydraulic Circuit, Power Steering System Hydraulic Pump, Steering Controller (Control Valve, Metering Device, Oil Flow), Flow Control Valve |
| Hydraulic System | 462-522 | Overall Construction Of Hydraulic System, Three Point Hitch System (System Outline, System Construction, Control Outline) |
| Electrical System | 523-596 | Wiring Diagram, Starting System (Starter Motor, Intake Air Heater, Safety Starting System), Engine Key Switch Shut-Off System (Fuel Control Motor, Operation) |
| Cabin | 597-661 | Air Conditioning System (Air Conditioner Component, Principles Of Air Conditioner, Outline Of Air Conditioning System, Refrigeration System, System Control, Electrical System) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| M-90 | ||
| Engine crankcase capacity | 16.3 L (17.2 U.S.qts., 14.3 Imp.qts.) | p. 10 |
| Transmission case capacity | 55 L (58.1 U.S.qts., 48.4 Imp.qts.) | p. 10 |
| Front axle differential case capacity | 6 L (6.3 U.S.qts., 5.3 Imp.qts.) | p. 10 |
| Fuel tank capacity | 150 L (39.7 U.S.gals., 33 Imp.gals.) | p. 10 |
| M-110, M-120 | ||
| Engine crankcase capacity | 20.8 L (22.0 U.S.qts., 18.3 Imp.qts.) | p. 10 |
| Transmission case capacity | 58 L (61.3 U.S.qts., 51.0 Imp.qts.) | p. 10 |
| Fuel tank capacity | 200 L (52.9 U.S.gals., 44 Imp.gals.) | p. 10 |
| M-110 | ||
| Front axle differential case capacity | 7 L (7.4 U.S.qts., 6.2 Imp.qts.) | p. 10 |
| M-90, M-110 | ||
| Front axle gear case for each side capacity | 3.5 L (3.7 U.S.qts., 3.1 Imp.qts.) | p. 10 |
| M-120 | ||
| Front axle gear case for each side capacity | 4.6 L (4.9 U.S.qts., 4.0 Imp.qts.) | p. 10 |
| All Models | ||
| Engine coolant capacity | 13 L (3.4 U.S.qts., 2.86 Imp.qts.) | p. 10 |
| Brake oil capacity | 0.3 L (0.3 U.S.qts., 0.3 Imp.qts.) | p. 10 |
Kubota M90, M110, M120 Common Problems This Manual Covers
Kubota M90 engine won't fire or starts hard in cold morning temperatures
Check that the fuel shutoff valve is fully open, then bleed air from the filter bowl. Clean the air cleaner primary element if it's past the 100 Hr service interval on page 28. Inspect the intake air heater circuit for continuity. Valve clearance should measure 0.25 mm cold per page 46; tight valves are a frequent no-start cause on high-hour engines.
Manual Section: Engine Troubleshooting (M-90)PTO shaft not rotating after engaging switch, implement won't spin p. 233
Verify the PTO switch and shift linkage are fully engaged, then read clutch operating pressure at the test port. Inspect PTO clutch disc thickness; worn discs measure below 1.3 mm (service limit per page 233) and need replacement. Low transmission fluid will starve the clutch pack and block full engagement, so confirm the level is correct.
Manual Section: Clutch TroubleshootingPower shift dashboard warning lamp on, tractor stuck in neutral with no movement
Read the fail-safe indicator lamp's flash pattern: the sequence tells you which circuit triggered the lockout. Make sure the clutch pedal is fully depressed before attempting to move. Inspect transmission wiring connectors at the firewall for corrosion or pushed-back pins; resistance across any connector should read near 0 ohms.
Manual Section: Transmission Troubleshooting (Power Shift System)Three-point hitch drifts slowly down under load, won't hold lift position p. 462
Confirm hydraulic filter service is current: both suction-side and return-side filters are due every 200 Hr per page 28. Inspect the draft and position control linkage for free, full-range movement. Use the hydraulic schematic to trace the hitch circuit and locate any leaking control valves or restricted return lines.
Manual Section: Hydraulic System TroubleshootingBrake pedal spongy with excessive travel, tractor pulls to one side under braking p. 378
Bleed both brake master cylinders to purge trapped air, then measure pedal free play: spec is 7 to 14 mm per page 378. If free play is in spec but the side pull remains, inspect the equalizer bar for a bent or seized pivot. Adjust pedal free play every 100 Hr per the maintenance schedule on page 28.
Manual Section: Brakes TroubleshootingBattery drains quickly, starter motor cranks slowly or won't engage
Test charging voltage at the battery terminals with the engine running at rated speed, and check battery condition every 100 Hr per page 28. Trace the alternator output circuit on the wiring diagram for corroded connectors or chafed wires. Clean both battery ground straps and test each fuse before pulling the alternator.
Manual Section: Electrical System TroubleshootingFrequently Asked Questions
What are the recommended service intervals?
Service intervals are spelled out by component. Engine oil changes every 300 hours, with the oil filter replaced every 600 hours. Swap the fuel filter every 400 hours and the transmission fluid every 600 hours. Radiator hoses and clamps get checked every 200 hours or six months, and replaced every 2 years if needed.
What fluids and capacities does this machine require?
Fuel is No. 2-D diesel (No. 1-D below -10 °C), holding 150 L on the M-90 and 200 L on the M-110/M-120. Coolant capacity runs 12.0 L (M-90) and 13.0 L (M-110/M-120) of fresh clean water with anti-freeze. The crankcase takes 16.3 L (M-90) or 20.8 L (M-110/M-120) of API Service Classification CD oil, and the transmission case uses KUBOTA UDT or SUPER UDT fluid: 55 L on the M-90, 58 L on the M-110/M-120.
How to troubleshoot engine won't start?
A no-start usually traces to no fuel, air in the fuel system, or a clogged fuel pipe. Fixes are replenishing fuel, bleeding the air out, or cleaning the blocked fuel components. Incorrect injection timing or a failing injection pump can also block starting, calling for adjustment or repair.
What are the hydraulic system specifications?
Draft control on this system is electronic. Pump-up capacity is 78 L (20.6 U.S.gals., 17.2 Imp.gals.)/min. Maximum lifting force reaches 2635 kg (5809 lbs) at the lifting points and 2360 kg (5203 lbs) at 610mm behind them. System pressure runs 19.12 to 19.61 MPa (195 to 200 kgf/cm², 2773 to 2845 psi).
What format is this Kubota M90, M110, M120 manual in?
It's a 661-page Workshop Manual in searchable PDF, available the moment checkout completes. Open it on a computer, tablet, or phone, with no shipping wait.
Document Quality
This document is a scanned PDF with an added OCR text layer, so you can search and copy the full text content. The text is crisp and consistently easy to read throughout. Diagrams and illustrations are clear raster images, and their labels are fully legible. Pages are clean with no visible scan artifacts, stains, or skewed content. There are no notable blank or filler pages in this section.
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