Part of the Kubota Repair Manuals.
This Kubota Workshop Manual covers the G21LD and G21HD diesel front mowers. It runs to 330 pages under publication 9Y011-15092 and is written for machines powered by the D782-E2-G21 three cylinder diesel engine.The manual works through every system: engine, the hydrostatic transmission and rear axle, brakes, front axle, steering with its power steering and EPS controller, the hydraulic system, the PTO, the electrical system with wiring diagrams, the mower deck, and the high dump grass collector. Each section carries servicing procedures, specifications, tightening torques and disassembly and assembly steps.With this PDF an owner or independent mechanic can restore lost drive, service the mower deck, set a blade to the correct torque, diagnose the steering or hydraulics, or trace an electrical fault without a dealer visit. Download it once and keep it on a phone, tablet or shop computer, and print the pages you need at the machine.
What's Inside This Kubota G21LD, G21HD Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety First | - | - |
| General | - | Identification, Wiring, Battery, Fuse, Connector, Handling of Circuit Tester, Lubricants, Fuel and Coolant |
| Engine | - | Engine Body, Lubricating System, Cooling System, Fuel System, Checking, Disassembling and Servicing, Separating Engine |
| Transmission and Rear Axle | - | Hydrostatic Transmission, Oil Flow, By-Pass Valve, Charge Pump, Checking, Disassembling and Servicing |
| Brakes | - | Parking Brake, Pedal System, Brake Assembly, Brake Lining, Brake Drum |
| Front Axle | - | Front Axle Support, Tie-Rod, Knuckle Arm, Kingpin, PTO Brake |
| Steering | - | System Configuration, Construction and Function of Main Components, Power Steering Assembly, EPS Controller, Troubleshooting Based on Each Symptom, Troubleshooting Based on Error Code, Checking, Disassembling and Servicing |
| Hydraulic System | - | Hydraulic Circuit, G21LD (Low Dump), G21HD (High Dump), Relief Valve (G21LD, G21HD), Mower Lifting Circuit (G21LD, Neutral, Down |
| PTO System | - | PTO Clutch Spring, Front PTO Belt, PTO Brake, PTO Shaft, Tension Arm, PTO Pulley |
| Electrical System | - | Wiring Diagram and Electrical Circuit, Wiring Diagram (G21LD and G21HD), Electrical Circuit (G21LD and G21HD), Checking, Disassembling and Servicing, Battery, Starting System, Engine Key Switch Shut-Off System |
| Mower | - | Mower Blade, Mower Belts, Gear Case, Center Pulley Holder, Side Blade Pulley Holder |
| High Dump Grass Collector | - | Checking, Disassembling and Servicing, Disassembling Grass Collector Bag, Platform Complete, Lift Arm Assembly and Head Guard |
Every system also includes checking, disassembling and servicing, servicing specifications, tightening torques, and troubleshooting.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Belt Retainer to Front PTO Belt Clearance | 2.0 mm | p. 303 |
| Center pulley holder mounting screw | 77.4 to 90.2 N·m | p. 304 |
| Front Tip of Blade to Rear Tip of Blade Difference (Allowable Limit) | Less than 5 mm | p. 303 |
| Left Tip of Blade to Right Tip of Blade Difference (Allowable Limit) | Less than 4 mm | p. 303 |
| Charge Relief Valve Setting pressure | 0.32 to 0.41 MPa | p. 139 |
| Transmission Fluid (Including HST and Cylinder) Capacity | 4.5 L | p. 139 |
| Fuel filter replacement frequency | Every 500 Hrs | p. 27 |
| Fuel tank capacity | 22 L (5.8 U.S.gal.) | p. 31 |
| Intake air line check frequency | Every 200 Hr | p. 27 |
| Air cleaner element cleaning frequency | Every 50 Hrs | p. 27 |
Kubota G21LD, G21HD Common Problems This Manual Covers
Weak or lost hydrostatic drive
The mower travels weakly or will not move under load. The Transmission and Rear Axle section covers the hydrostatic transmission structure, oil flow, by-pass valve and charge pump needed to diagnose a drive fault.
Manual Section: Transmission and Rear Axle p. 130Overheating or hard starting
The diesel overheats, loses power or is hard to start, commonly from cooling system, fuel delivery or engine wear issues. The Engine section covers oil pressure, servicing specifications and the checks to isolate the cause.
Manual Section: Engine p. 73Deck vibration or uneven cut
Deck vibration, an uneven cut or blade damage usually traces to worn blades, spindle or bearing wear, or deck alignment. The Mower section covers servicing, blade torque and deck disassembly and assembly.
Manual Section: Mower p. 300PTO or deck will not engage
The deck will not engage or the PTO drops out under load, pointing to the PTO clutch or its adjustment. The PTO System section covers the clutch and the servicing needed to restore engagement.
Manual Section: PTO System p. 260Weak grass collector or mower lift
The mower or grass collector lifts slowly or not at all, often from a relief valve or cylinder issue. The Hydraulic System section covers the mower lifting circuit, grass collector lift cylinder circuit and relief valve.
Manual Section: Hydraulic System p. 221Brake or steering problems
Heavy steering or weak brakes point to wear or adjustment in the steering and power steering assembly. The Steering section covers the EPS controller, component construction and the failure diagnosis to work through.
Manual Section: Steering p. 184Frequently Asked Questions
Which mowers does this manual cover?
It covers the Kubota G21LD and G21HD diesel front mowers under publication number 9Y011-15092, across 330 pages.
Does it cover the power steering and EPS controller?
Yes. The Steering section covers the system configuration, the power steering assembly and the EPS controller, plus the cautionary steps before starting failure diagnosis. p. 184
Does it give the mower blade torque?
Yes. The Mower section lists the mower blade screw torque as 98.0 to 117.6 N-m, along with pulley holder and tension arm mounting torques for the deck. p. 300
Are wiring diagrams included?
Yes. The Electrical System section provides the wiring diagram and electrical circuit for the G21LD and G21HD. p. 269
What do I get after purchasing this Kubota G21LD manual?
A 330-page Workshop Manual in searchable PDF, available the moment your checkout completes. View it on a computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this Kubota G21LD manual?
None at all. The PDF is DRM-free, so print whatever sections you want to carry out to the shop. Standard letter or A4 paper works fine.
Does this Kubota G21LD Workshop Manual have electrical diagrams?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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