Part of the Kubota Repair Manuals.
This is the Kubota G23 and G26 workshop manual, the factory service documentation for these front-mount diesel mowers and their D902-E3-GT and D1005-E3-GT engines. Across 343 pages it walks through the engine, transaxle and HST, front axle, steering, hydraulic system, electrical system, mower deck, and grass collector.You get factory troubleshooting charts, servicing specifications, tightening torques, and step by step disassembly and reassembly for each system, along with wiring diagrams and hydraulic circuit drawings for both models. Whether you are chasing a no-start, rebuilding the HST, resealing a lift cylinder, or tracing a charging fault, the procedures and allowable limits are here.Delivered as an instant PDF download you can read on any device or print, this is the same reference a Kubota technician uses to diagnose and repair the G23 and G26.
What's Inside This Kubota G23, G26 Manual
| System | Pages | Key Topics |
|---|---|---|
| To the Reader | - | Information, Safety First, Safety Label, Dimension, Engine Identification, Model Identification, General Precautions, Maintenance Check List |
| I Information | - | - |
| G General | - | Tractor Identification, Serial Number, Cylinder Number, General Precautions, Wiring, Battery, Fuse, Connector |
| Engine | - | G23, G26 |
| Transaxle | - | HST Section, Rear Axle, Brake, PTO Clutch, Mechanical PTO Clutch, Hydraulic PTO Clutch |
| Front Axle | - | Tie-Rod End, Center Pin, Pin Support Bushing, Bushing, Kingpin, Mower, Front Weight |
| Steering | - | Hydraulic Circuit, G23 Mechanical PTO Clutch Model, G26 Hydraulic PTO Clutch Model, Steering Controller, Steering Cylinder |
| Hydraulic System | - | Hydraulic Circuit, G23 (Mechanical PTO, Ld Model), Hd Model), G26 (Hydraulic PTO, Hydraulic Pump, Relief Valve, Flow Priority Valve |
| Electrical System | - | Wiring Diagram, G23, G26, Starting System, Starting Circuit, Safety Switch, Charging System, Electrical Circuit |
| Mower | - | Power Transmission, Mower Gear Case Power Train, Lifting Mechanism |
| Grass Collector | - | Disassembling Grass Collector |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head screw torque | 64 to 68 N·m (6.5 to 7.0 kgf·m, 47 to 50 lbf·ft) | p. 96 |
| Front coupling mounting bolt torque | 24 to 27 N·m (2.4 to 2.8 kgf·m, 18 to 20 lbf·ft) | p. 96 |
| Fuel filter element replacement interval | every 400 Hr | p. 32 |
| Battery terminal potential difference | Less than 0.1 V | p. 285 |
| Wiring harness sections | No specific numerical values for clearance, torque, or replacement are provided; only general instructions for inspection and repair/replacement if damaged or loose. | p. 22 |
| Fuse (1) capacity | 10 A | p. 68 |
| Slow blow fuse (9) capacity | 50 A | p. 68 |
| Fan belt deflection | 7.0 to 9.0 mm (0.28 to 0.35 in.) | p. 90 |
| Front PTO belt tension spring length | 88 to 91 mm (3.46 to 3.58 in.) | p. 54 |
| Transmission oil filter replacement interval | every 200 Hr | p. 32 |
| Main Relief Valve Setting Pressure | 12.3 to 12.8 MPa (125 to 131 kgf/cm2, 1790 to 1850 psi) | p. 251 |
| Radiator cap pressure falling time | More than 10 seconds for pressure fall 88 → 59 kPa (0.90 → 0.60 kgf/cm2, 13 → 8.6 psi) | p. 100 |
Kubota G23, G26 Common Problems This Manual Covers
Engine cranks but will not start
Fuel delivery problems, air in the fuel lines, or a clogged fuel filter are common causes of a no-start on these diesels. The Engine section provides the troubleshooting chart and servicing specifications to work through it.
Manual Section: 1 Engine p. 81Intermittent electrical faults or no-start
Loose or damaged wiring, poor routing near hot or moving parts, and battery connection issues can cause blown circuits and intermittent starting faults. The Electrical System section covers the wiring diagrams, starting circuit, and safety switches.
Manual Section: 6 Electrical System p. 266Weak or slow hydraulics
Low or contaminated fluid, a filter due for service, or relief valve and pump wear show up as weak lift and slow response. The Hydraulic System section covers the pump, relief valve, control valve, and lift cylinders with setting pressures.
Manual Section: 5 Hydraulic System p. 231Overheating or reduced drive performance
Cooling system issues, a blocked radiator or screen, or a loose fan belt can lead to overheating and lost performance. The Engine section covers checking and adjusting the cooling and belt components.
Manual Section: 1 Engine p. 81Poor or reduced cutting performance
Worn blades, drive belt trouble, or a power transmission fault in the deck reduce cut quality. The Mower section covers the power transmission, gear case power train, and lifting mechanism.
Manual Section: 7 Mower p. 308Heavy or unresponsive steering
A steering controller fault, worn cylinder, or a relief valve out of spec makes steering heavy. The Steering section covers the hydraulic circuit, steering controller, and steering cylinder.
Manual Section: 4 Steering p. 216Grass collector will not lift or dump
Hydraulic circuit trouble or worn collector components stop the grass collector lifting and dumping cleanly. The Grass Collector section covers troubleshooting, servicing specifications, and disassembly.
Manual Section: 8 Grass Collector p. 329Frequently Asked Questions
Which machines does this manual cover?
It covers the Kubota G23 and G26 front-mount mowers and their D902-E3-GT and D1005-E3-GT diesel engines. Many procedures show both models, with model-specific specifications called out where they differ.
Does it include torque specifications for the engine?
Yes. The Engine section lists servicing specifications and tightening torques for the G23 and G26, including the cylinder head screw torque of 64 to 68 N·m, along with troubleshooting and disassembly procedures. p. 81
Are wiring diagrams included?
Yes. The Electrical System section provides wiring diagrams for both the G23 and G26, plus the starting, charging, and lighting circuits with the safety switch and IC regulator details. p. 266
How do I get the manual after buying?
You download the PDF instantly after checkout. There is no shipping and no waiting, and you can save your own copy and reopen it whenever you need it.
How will I receive this Kubota G23 Workshop Manual?
The download is instant. The full 343-page searchable Workshop Manual lands in your account right after payment, ready to open on a laptop, tablet, or phone out in the shop.
Am I able to print pages from this Kubota G23 manual?
No restrictions at all. Print a single page, a full chapter, or the whole manual. The PDF ships completely unlocked.
Is there a hydraulic diagram in this Kubota G23 Workshop Manual?
Yes. The manual carries hydraulic system diagrams, circuit schematics, and component specifications.
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