Need factory-level rebuild data for your Kubota M5640SU or M5640DT-SU? This 358-page workshop manual (OEM #9Y111-03650) is organized into eleven systems: engine, clutch, transmission, rear axle, brakes, front axle, steering, hydraulics, and electrics. Hydraulic schematics trace every circuit from pump to relief valve, wiring diagrams cover the charging system, lighting, meter panel, and Operator Presence Control, and 11 pages of torque tables sit alongside 16 pages of troubleshooting procedures across all major assemblies. Every section carries disassembly sequences and servicing specs taken straight from Kubota's factory data. Set the cylinder head screws to 93.2 to 98.0 N·m and the rear wheel mounting nuts to 260 to 304 N·m before you pull anything apart. Your M5640 is down. Download it once, search by keyword, open it on any device, and get back to work.
What's Inside This Kubota M5640SU, M5640DT-SU Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | 3-14 | - |
| G General | 15-83 | Tractor Identification, General Precautions, Handling Precautions for Electrical Parts and Wiring, Lubricants, Fuel and Coolant, Tightening Torques, Check and Maintenance |
| 1 Engine | 84-149 | EGR (Exhaust Gas Recirculation) System, EGR Valve, EGR Cooler, Engine Body, Lubricating System, Cooling System, Fuel System, Turbocharger |
| 2 Clutch | 150-176 | Travelling Clutch, PTO Clutch, Clutch Pedal, Clutch Disc, Diaphragm Spring, Pressure Plate, PTO Clutch Valve, PTO Clutch Pack |
| 3 Transmission | 177-213 | 4WD Model, 2WD Model, Traveling System, Pto System, Shift Linkage Mechanism, Four Wheel Drive Section |
| 4 Rear Axle | 214-225 | Rear Axle, Planetary Gear, Rear Axle Nut, Rear Axle Cover |
| 5 Brakes | 226-236 | Brake Shaft, Brake Plate, Brake Disc, Cam Plate, Brake Cam, Brake Cam Lever, Brake Pedal, Brake Pedal Shaft |
| 6 Front Axle | 237-264 | Front Axle, Front Wheel, Differential Case, Pinion Shaft, Spiral Bevel Pinion Shaft, Bevel Gear, Front Axle Cover, Front Gear Case |
| 7 Steering | 265-284 | Steering Mechanism, Steering Controller, Power Steering Hydraulic Pump, Steering Cylinder (4Wd Model), Steering Cylinder (2Wd Model) |
| 8 Hydraulic System | 285-308 | Hydraulic Circuit, Hydraulic Pump, Relief and Safety Valve, Position Control Linkage, Hydraulic Cylinder, Position Control |
| 9 Electrical System | 309-358 | Wiring Diagram, Starting System, Charging System, Lighting System, Meter Panel, Opc (Operator Presence Control) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| M5640SU, M5640DT-SU (4WD model) | ||
| Front wheel mounting nut (4WD) | 168 to 196 N·m (17.1 to 20.0 kgf·m, 124 to 145 lbf·ft) | p. 36 |
| M5640SU, M5640DT-SU (2WD model) | ||
| Front axle mounting bolt (2WD) | 124 to 147 N·m (12.6 to 15.0 kgf·m, 91.5 to 108.9 lbf·ft) | p. 75 |
| All Models | ||
| Cylinder head screws | 93.2 to 98.0 N·m (9.5 to 10.0 kgf·m, 68.8 to 72.3 lbf·ft) | p. 98 |
| M10 (7T) general use screws, bolts and nuts | 48 to 55 N·m (4.9 to 5.7 kgf·m, 36 to 41 lbf·ft) | p. 28 |
| Fuel filter replacement interval | every 400 Hr | p. 30 |
| Engine oil filter replacement interval | every 400 Hr | p. 30 |
| Engine oil filter tightening | Tighten the filter quickly until it contacts the mounting surface. Tighten filter by hand an additional 1/2 turn only. | p. 33 |
| Hydraulic oil filter replacement interval | every 300 Hr | p. 30 |
| Hydraulic oil filter tightening | Tighten filter by hand an additional 1/2 turn only. | p. 34 |
| Air cleaner primary element cleaning interval | every 100 Hr | p. 30 |
| Air cleaner primary element replacement interval | every 1 year | p. 30 |
| Radiator cap pressure fall time | More than 10 seconds for pressure fall from 88 to 59 kPa (from 0.9 to 0.6 kgf/cm², from 13 to 9 psi) | p. 102 |
Kubota M5640SU, M5640DT-SU Common Problems This Manual Covers
Engine cranks but will not start, or runs unevenly during cold-weather starts. p. 92
Test compression pressure against the 2.5 MPa allowable limit on page 92. Inspect the fuel filters and replace them if past the 400 Hr interval. Bleed air from the fuel lines so the engine starts and runs smoothly.
Manual Section: 1 EngineImplement won't reach full height, or the front-loader cylinders respond slowly under heavy load. p. 34
Inspect the hydraulic fluid level and top it up if low. Replace the hydraulic oil filter if past the 300 Hr interval, then tighten the new filter by hand an additional 1/2 turn only, as detailed on page 34. Check the relief valve for debris.
Manual Section: G GeneralTractor overheats under load, with the coolant temperature gauge reading well into the high range. p. 101
Measure fan belt deflection and set it to 7.0 to 9.0 mm under 98 N of force (page 101). Then time the radiator cap pressure drop on page 102: it should take more than 10 seconds to fall from 88 to 59 kPa.
Manual Section: 1 EngineTransmission whines, or the gears clash when shifting between forward and reverse. p. 26
Drain the transmission case and refill with exactly 40.0 L of fresh fluid, per page 26. Inspect the clutch linkage and confirm the pedal travels smoothly. Check for worn synchromesh parts if the clashing continues after the fluid change.
Manual Section: G GeneralRear PTO clutch slips under load, or the implement shaft won't turn at its rated speed. p. 96
Gauge the PTO clutch operating pressure at the test port. Verify the engine oil pressure stays above the 250 kPa allowable limit at rated speed on page 96, since internal pressure drops hurt engagement. Inspect the clutch pack discs for wear.
Manual Section: 1 EngineFrequently Asked Questions
M5640SU quit while moving dirt and won't start
Several things can keep it from firing: no fuel (replenish, page G-10), air in the fuel system (bleed, page G-34), or a clogged fuel filter (replace, page G-22). Less common causes are incorrect injection timing (adjust, page 1-S15) or a defective starter motor (repair or replace, pages 9-S13, 9-S31).
How do I engage and disengage the PTO on a Kubota M5640SU if it won't start
A defective PTO switch is one cause of a no-start. Replace the switch, as indicated on page 9-S23. To set PTO clutch lever movement, check the lever at its "ON" and "OFF" positions on the guide, then adjust the clutch control cable length if needed, as detailed on page 2-S7.
Where is the safety switch on a Kubota M5640SU and how do I adjust or replace it
The manual treats the PTO and Neutral switches as safety switches. Test the PTO switch for continuity with an ohmmeter; replace it if faulty (page 9-S23). For the Neutral switch, adjust continuity with different gasket thicknesses (1.0 mm or 1.5 mm) as needed, and replace it if faulty (page 9-S23). "Checking Engine Start System" also notes adjusting or replacing the safety switch if the engine cranks during testing (page G-20).
How to reset Kubota M5640SU safety switch
There's no 'reset' procedure for the safety switches, but the manual does cover adjusting them. For the Neutral switch, set proper continuity using different gasket thicknesses, 1.0 mm or 1.5 mm (page 9-S23). If testing shows a safety switch is defective, replace it (page G-20).
How quickly can I access this Kubota M5640SU, M5640DT-SU manual after buying?
It's a 358-page searchable PDF, and it downloads the moment you buy. Read it on a phone, tablet, or shop PC while you're under the hood. No shipping, no waiting.
Can I print specific sections of this Kubota M5640SU, M5640DT-SU manual?
Yes. The PDF carries no DRM, so you can print any page or section you need for the shop. It works with any standard printer.
Are electrical wiring diagrams included in this Kubota M5640SU, M5640DT-SU?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
Document Quality
This document is a high-quality native digital PDF, allowing you to search and copy the full text with ease. All text is crisp and consistently readable throughout the manual. Diagrams and illustrations are a mix of sharp vector-like images and clear raster graphics, with all labels remaining perfectly legible even when zoomed in. The pages are clean, free from any scan artifacts, stains, marks, or skewed content. There are a few blank pages that serve as section dividers.
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