This Kubota MX5100 Workshop Manual (OEM #9Y111-02450) runs 564 pages and stays on one job: keeping your MX5100 or MX5100HST tractor at factory spec. Hydraulic schematics trace the full three-point system circuit and oil flow, while wiring diagrams map the engine starting and OPC safety systems. Another 150 step-by-step disassembly and assembly procedures cover the clutch, transmission, brakes, front axle, and steering. Troubleshooting charts for every major system, exploded views throughout, and maintenance schedules from daily inspection out to 3,000-hour intervals fill in the rest. Need a number fast? Fill the transmission case to 44.0 L, top the engine oil with filter to 8.0 L, and torque M12 engine-to-clutch housing fasteners to 77.5 to 90.2 N·m. Bookmarks jump you straight to any system, and keyword search pulls the exact figure without scrolling.
What's Inside This Kubota MX5100, MX5100HST Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 3-14 | Safety First, Safety Decals, Specifications, Travelling Speeds, Dimensions |
| General | 15-84 | Lubricants, Fuel And Coolant, Maintenance, Special Tools (Engine, Tractor), Tires (Types Of Tire, Treads Adjustment, Tire Pressure, Tire Liquid Injection, Imprement Limitations) |
| Engine | 85-154 | Servicing Specifications, Checking |
| Clutch | 155-186 | Travelling Clutch (Linkage Mechanism), Pto Clutch (Shift Linkage, Structure, Oil Flow), Servicing Specifications, Checking |
| Transmission | 187-246 | Power Train (Main Gear Shift Section, Shuttle Shift Section, Range Gear Shift Section, Front Wheel Drive Section), Pto System (Structure, Pto Clutch), Structure |
| Rear Axle | 247-254 | Structure, Checking |
| Brakes | 255-267 | Structure, Servicing Specifications, Checking |
| Front Axle | 268-293 | Front Wheel Alignment, Structure (2Wd Type, 4Wd Type), Servicing Specifications, Checking |
| Steering | 294-317 | Structure (Steering Linkage, Oil Flow, Steering Cylinder), Servicing Specifications, Checking |
| Hydraulic System | 318-360 | Hydraulic Circuit For Three Point Hydraulic System, Hydraulic Cylinder, Position Control Valve |
| Electrical System | 361-408 | Engine Starting System (Electric Circuit, Safety Switch), Opc System (Electrical Circuit, Wiring Diagram, Servicing Specifications, Checking |
| MX5100HST Supplement | 409-564 | Lubricants Fuel And Coolant, Maintenance Check List, Disassembling And Assembling (Separating Engine From Tractor), Electrical Circuit |
Every system also includes tightening torques, disassembling and servicing, and troubleshooting.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| General Use Screws, Bolts and Nuts (M8, Ordinariness) | 18 to 20 N·m | p. 26 |
| Engine Oil Capacity (with filter) | 8.0 L | p. 24 |
| Transmission Case Capacity | 44.0 L | p. 24 |
| Cooling System Capacity (with recovery tank) | 7.0 L | p. 24 |
| Valve Clearance (Engine, when cold) | 0.18 to 0.22 mm | p. 91 |
| Fan Belt Tension (deflection) | 12 mm | p. 41 |
| Clutch Pedal Free Play | 20 to 30 mm | p. 34 |
| Brake Pedal Free Play | 15 to 20 mm | p. 41 |
| Engine Oil Pressure (at Idle Speed) | More than 98 kPa | p. 95 |
| MX5100 | ||
| Steering wheel mounting nut | 48.0 to 55.9 N·m | p. 27 |
| PTO Clutch Operating Pressure | 2.25 to 2.45 MPa | p. 163 |
| MX5100HST | ||
| PTO Clutch Operating Pressure | 2.25 to 2.45 MPa | p. 498 |
Kubota MX5100, MX5100HST Common Problems This Manual Covers
Kubota MX5100 engine turns over slowly or simply does not start in cold weather
Check the battery voltage and fuel delivery components. Adjust the engine valve clearance when cold to 0.18 to 0.22 mm as outlined on page 91. Bleed the injection lines to remove trapped air. Test the glow plugs for proper heating operation.
Manual Section: Engine Starting IssuesTravelling clutch slips under heavy load or chatters aggressively during engagement while pulling implements
Measure the clutch pedal free play at the pedal pad. Adjust the linkage rods to achieve 20 to 30 mm of free play as instructed on page 34. Inspect the clutch disc for oil contamination. Replace the friction disc if damaged.
Manual Section: Clutch Malfunctions (Travelling Clutch)Front wheels wander to right or left and steering force fluctuates during operation
Inspect the steering linkage for wear and loose connections. Torque the steering wheel mounting nut to 48.0 to 55.9 N·m as listed on page 27. Verify the hydraulic lines are free of air and check the steering cylinder for leaks.
Manual Section: Steering System ProblemsThree-point hydraulic implement does not rise to maximum height or drops rapidly by its own weight
Verify the hydraulic fluid level on the dipstick. Fill the transmission case to the full 44.0 L capacity noted on page 24. Inspect the position control valve and hydraulic cylinder seals for internal leakage. Replace damaged o-rings to restore lifting power.
Manual Section: Hydraulic Implement ControlFrequently Asked Questions
What are the recommended service intervals?
The recommended service intervals for the MX5100HST include checking the engine start system every 50 hours and the power steering oil line every 200 hours. The transmission oil filter and oil cooler line should be replaced or checked every 200 hours, and the power steering oil line and oil cooler line should be replaced every 2 years. Fuses and light bulbs are replaced as required.
What fluids and capacities does this machine require?
The MX5100HST requires 48.0 L (12.7 U.S.gals) of No. 2-D diesel fuel for the fuel tank, 7.0 L (7.4 U.S.qts) of fresh clean soft water with anti-freeze for the engine coolant, and 8.0 L (8.5 U.S.qts) of API CF or better engine oil for the crankcase. The transmission case needs 44.0 L (11.6 U.S.gals) of KUBOTA UDT or SUPER UDT fluid, and the front axle case requires 9.0 L (9.5 U.S.qts) of KUBOTA UDT or SUPER UDT fluid or SAE 80-90 gear oil. Multipurpose grease NLGI-2 or NLGI-1 (GC-LB) is used for greasing points.
How to troubleshoot engine won't start?
When the engine won't catch, start with the basics: no fuel (replenish, page G-14), air in the fuel system (vent it, page G-41), or a clogged fuel filter (replace, page G-26). If those check out, look at injection timing (adjust, page 1-S18) or a failing injection pump (replace, page 1-S19).
What are the hydraulic system specifications?
The power steering hydraulic pump has a rated delivery of 18.17 L/min (4.80 U.S.gals/min) with an allowable limit of 16.17 L/min. The relief valve setting pressure for 3-point hydraulic system is 18.1 to 19.1 MPa (185 to 195 kgf/cm²), and the hydraulic cylinder bore I.D. is 90.000 to 90.050 mm (3.54330 to 3.54527 in) with an allowable limit of 90.150 mm (3.54921 in).
Is this Kubota MX5100, MX5100HST Workshop Manual a digital download?
Instant PDF download. You get the full 564-page searchable Workshop Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print specific sections of this Kubota MX5100, MX5100HST Workshop Manual?
Yes, print as many copies as you want. There are no restrictions. Many mechanics print just the section they need and bring it to the shop floor.
Are there wiring harness diagrams in this Kubota MX5100, MX5100HST manual?
Yes, this Kubota MX5100, MX5100HST Workshop Manual includes complete electrical wiring diagrams, wire routing, and connector pinouts.
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, which is generally clear and easy to read throughout the manual. All diagrams, illustrations, and images, including the cover logos, are raster-based, but they are sufficiently clear, and all labels are readable. The pages are clean with minimal scan artifacts or marks, and you will not find any notable blank or filler pages.
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