Get the factory runbook for your GX-series tractor with this 178-page PDF. It covers the M100GX, M110GX, M126GX, and M135GX models from top to bottom. You will find 12 pages of safety procedures detailing ROPS requirements, slope operation, and PTO rules, alongside a complete instrument panel walkthrough mapping out every switch. The guide provides 25 pages of maintenance schedules broken into intervals from 50 to 3,000 hours. It also includes fluid capacities, troubleshooting charts for engine and Power Shift/Range Shift faults, and error code references. Factory specs confirm the fuel tank holds 190 L, while front wheel bolts require 260 to 304 N-m of torque. Download the searchable file instantly and use the bookmarks to jump straight to the repair you need.
What's Inside This Kubota M100–M135 Series Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safe Operation | 11-22 | BEFORE OPERATING THE TRACTOR, CAB, ROPS, Operating on slopes, Driving the tractor on the road, OPERATING THE PTO, DANGER, WARNING AND CAUTION LABELS |
| Servicing of Tractor | 23-24 | Tractor identification plate, Tractor serial number, CAB / ROPS serial number, Engine serial number, Diesel particulate Filter (DPF) serial number |
| Specifications | 25-27 | Specification Table, Travelling Speeds |
| Implement Limitations | 28-29 | Tread (max. width), Lower link end max. lifting capacity, Max. Drawbar Load, Trailer loading weight, Implement weight |
| Instrument Panel and Controls | 30-34 | Instrument Panel, Switches and Hand Controls, Foot and Hand Controls |
| Pre-Operation Check | 35 | Daily Check |
| Operating the Engine | 36-49 | Exhaust Aftertreatment Devices, Starting the Engine, Cold Weather Starting, Stopping the Engine, Warming Up, Jump Starting |
| Operating the Tractor | 50-87 | Operating New Tractor, Boarding and Leaving the Tractor, Starting, Stopping, Check During Driving, Side Digital Display, Electronic Engine Control, Auto Mode |
| PTO | 88-90 | PTO Operation |
| Three-Point Hitch and Drawbar | 91-96 | 3-Point Hitch, Drawbar |
| Hydraulic Unit | 97-105 | 3-Point Hitch Control System, Remote Hydraulic Control System |
| Tires, Wheels and Ballast | 106-111 | Tires, Wheel Adjustment, Ballast |
| CAB Operation | 112-119 | Door and Window, Dome Light, Wiper, Air Conditioner, Installing the Implement Control Box, Electrical Outlet, Beacon Light |
| Maintenance | 120-125 | Service Intervals, Lubricants, Fuel and Coolant |
| Periodic Service | 126-161 | How to Open the Hood, Daily Check, Every 50 Hours, Every 100 Hours, Every 200 Hours, Every 300 Hours, Every 400 Hours, Every 600 Hours |
| Storage | 162 | Tractor Storage, Removing the Tractor from Storage |
| Troubleshooting | 163-166 | Engine Troubleshooting, Power Shift/Range Shift Trouble Shooting |
| Options | 167 | Heavy Duty Fuel Tank Guard, Front end weights, Rear Wheel Weights, Creep Speed Kit, 80" Wide Axle, Instructional Seat |
| Apprendices | 168-175 | Side Digital Display |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Wheel bolt torque (Front) | 260 to 304 N-m (26.5 to 31.0 kgf-m) | p. 111 |
| Wheel bolt torque (Rear) | 343 to 401 N-m (35.0 to 41.0 kgf-m) | p. 111 |
| Fuel tank capacity | 190 L | p. 25 |
| Hydraulic system pressure | 19.6 MPa (200 kgf/cm²) | p. 26 |
| M100GX, M110GX | ||
| Fuel filter replacement instruction | Tighten the filter quickly until it contacts the mounting surface. Tighten filter by hand an additional 1/2 turn only. | p. 126 |
| Fuel filter replacement interval | every 400 Hr | p. 99 |
| Engine oil capacity | 10.5 L | p. 25 |
| Coolant capacity | 9.6 L | p. 25 |
| Max. lifting force (at lifting points) | 5000 kg | p. 26 |
| M126GX, M135GX | ||
| Engine oil capacity | 14.6 L | p. 25 |
| Coolant capacity | 14.6 L | p. 25 |
| Max. lifting force (at lifting points) | 6100 kg | p. 26 |
Kubota M100–M135 Series Common Problems This Manual Covers
Kubota M110GX engine cranks but will not start or runs unevenly after replacing the fuel filter. p. 126
Verify the new filter is installed correctly by tightening it quickly until it contacts the mounting surface, then tightening an additional 1/2 turn only. Check the fuel level since the tank holds 190 L, as noted on page 25. Open the injector pump bleeder valve to purge trapped air.
Manual Section: Periodic ServiceTractor requires excessive foot pressure to stop or brakes feel spongy when driving on the road. p. 137
Measure the brake linkage to ensure the proper brake pedal free travel is between 3 to 7 mm. Adjust the linkage rod if the measurement is out of spec. Review the brake pedal adjustment procedure on page 115 for instructions on altering the pedal height.
Manual Section: Periodic ServiceFront wheels making a clicking noise or steering feels unstable during heavy loader work. p. 111
Inspect the front axle hardware and torque the front wheel bolts to 260 to 304 N-m (26.5 to 31.0 kgf-m). Check the steering alignment on page 120 to confirm the proper toe-in is set to 2 to 8 mm. Tighten any loose tie rod ends immediately.
Manual Section: Tires, Wheels and BallastThree-point hitch struggles to lift heavy implements or remote cylinder operation feels noticeably sluggish. p. 26
Test the rear remotes to confirm the hydraulic system pressure reaches 19.6 MPa (200 kgf/cm²). Inspect the fluid level and review the maintenance intervals on page 98 to ensure the suction screens are clean. Replace the hydraulic filters if the system fluid appears milky or degraded.
Manual Section: Hydraulic UnitFrequently Asked Questions
How to reset a Kubota M110GX/M135GX fault code?
The manual does not provide a user-reset procedure for fault codes. For errors like E-R51, E-R20, E-R37, E-R31 to 36, E-R38 to 44, E-R44, and shuttle switch issues, the factory recommendation is to contact your local KUBOTA Dealer. Limited travel may be possible by moving the range shift lever to L, which allows the machine to travel in 1st to 8th gears.
How do I clear an error code on a Kubota GX-series tractor?
Operators cannot clear error codes directly. The documentation indicates that for any displayed code, including E-R51, E-R20, E-R37, E-R31 to 36, E-R38 to 44, E-R44, or shuttle switch trouble, you must contact your local KUBOTA Dealer for repairs.
What are the torque specs for Kubota M100GX/M110GX/M126GX/M135GX wheel bolts, head bolts, or hydraulic fittings?
The wheel bolt torque specifications are 260 to 304 N-m (26.5 to 31.0 kgf-m) for standard bolts and 305 to 325 N-m (31.1 to 33.2 kgf-m) for cast iron disk. For the king-pin pivot, the adjusting screw torque is 4.9 to 9.8 N-m (0.5 to 1.0 kgf-m) and the lock nut torque is 98.1 to 147 N-m (10 to 15 kgf-m). The drain plug (M10) for the fuel tank requires 39.2 to 45.1 N-m (28.9 to 33.3 ft-lbs) of torque, and the tank cover lock bolt (M8) requires 23.5 to 27.5 N-m (17.3 to 20.3 ft-lbs).
Document Quality
This document is a scanned PDF of a printed manual, but it includes an OCR layer, so you can search and copy the full text. The text is crisp and easy to read throughout. Diagrams and illustrations are clear raster images, with labels that are generally readable. Pages are clean, without significant scan artifacts or skewed content.
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