Part of the Kubota Repair Manuals.
This is the factory Kubota workshop manual for the GZD15 zero-turn mower, covering the GZD15-LD and GZD15-HD models with the Z602-GZD15 diesel engine. It runs 271 pages and is divided into mechanism and servicing for each section, so you understand how a system works before you take it apart.Six sections cover the whole machine: general service data, engine, transaxle, front axle, hydraulic system, electrical system, and the mower deck. You get troubleshooting, servicing specifications, tightening torques, and step by step checking, disassembly, and assembly procedures for the hydrostatic transmission, pump and motor, lift cylinders, wiring, charging and starting systems, blades, and gear box. Whether you are curing a no-start, leveling the deck, servicing the hydrostatic drive, or rebuilding a spindle, this PDF gives you the factory reference for the GZD15.
What's Inside This Kubota GZD15-LD, GZD15-HD Manual
| System | Pages | Key Topics |
|---|---|---|
| General | - | Identification, Handling Precautions for Electrical Parts and Wiring (Battery, Fuse, Connector, Handling of Circuit Tester), Lubricants, Fuel and Coolant, Maintenance |
| Engine | - | Engine Body (Half-Floating Head Cover, Gear Case, Oil Pan), Lubricating System, Cooling System, Fuel System (Fuel Line) |
| Transaxle | - | Travelling System (Hydrostatic Transmission, Structure, Pump and Motor, Check and High Pressure Relief Valve, Oil Flow, Power Trains Operation, Motion Control Linkage, Final Reduction Gear Section, PTO System, Brake) |
| Front Axle | - | Structure, Disassembling and Servicing (Checking and Adjusting, Disassembling and Assembling, Separating Floor Cover and Front Axle, Disassembling Front Wheel and Wheel Bracket) |
| Hydraulic System | - | Hydraulic Circuit, Hydraulic Pump, Hydraulic Control Valve, Lift Cylinder (Mower Lift Cylinder, Grass Collector Lift Cylinder and Grass Collector Dump Cylinder), Mower Linkage |
| Electrical System | - | Wiring Diagram, Starting System (Starter, Glow Plug, Safety Switch, Fuel Pump, Engine Stop Solenoid), Charging System (AC Dynamo, Regulator, Easy Checker) |
| Mower | - | Power Transmission, Lifting Mechanism, Disassembling and Assembling (Checking and Adjusting), Checking |
Every system also includes servicing specifications, tightening torques, and troubleshooting.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Mower blade screw tightening torque | 98 to 118 N·m (10.0 to 12.0 kgf·m, 72.3 to 86.8 ft-lbs) | p. 262 |
| Gear box screw tightening torque | 23.5 to 27.4 N·m (2.4 to 2.8 kgf·m, 17.4 to 20.2 ft-lbs) | p. 262 |
| Gear box mounting screw (Standard type / Reamer type) tightening torque | 48.1 to 55.9 N·m (4.9 to 5.7 kgf·m, 35.4 to 41.2 ft-lbs) | p. 262 |
| Air cleaner element cleaning interval | every 50 hours | p. 26 |
| Air cleaner element replacement interval | every 1 year | p. 26 |
| Glow plug tightening torque | 7.85 to 14.7 N·m (0.8 to 1.5 kgf·m, 5.8 to 10.8 ft-lbs) | p. 88 |
| Glow plug resistance | Approx. 0.9 Ω | p. 240 |
| Fuel filter element check interval | every 100 hours | p. 26 |
| Fuel filter element replacement interval | every 400 hours | p. 26 |
| Front Tip of Blade to Rear Tip of Blade Difference | 0 to 6.0 mm (0 to 0.24 in.) | p. 261 |
| Left Tip of Blade to Right Tip of Blade Difference | Less than 3 mm (0.1181 in.) | p. 261 |
| Fan belt adjustment interval | every 100 hours | p. 26 |
Kubota GZD15-LD, GZD15-HD Common Problems This Manual Covers
Engine will not start
A GZD15 that cranks but will not start often has a safety interlock not satisfied, a weak battery, or a fuel or glow plug fault. The Electrical System section covers the starting system, safety switch, and charging system to isolate it.
Manual Section: 5 Electrical System p. 223Overheating or lost power
Overheating on a zero-turn usually traces to a clogged radiator screen, dirty cooling fins, or low coolant. The Engine section covers the cooling system with checking and servicing procedures.
Manual Section: 1 Engine p. 72Uneven cut, streaking, or scalping
Cut quality problems come from worn blades, deck level, or lift adjustment. The Mower section covers power transmission, the lifting mechanism, blade checking, and the deck adjustment values.
Manual Section: 6 Mower p. 255Excessive vibration while mowing
Vibration points to unbalanced or bent blades, a loose spindle, or worn deck parts. The Mower section covers blade checking, tip to tip difference limits, and gear box service.
Manual Section: 6 Mower p. 255Weak traction or hydrostatic drive
Poor drive or weak traction ties to the hydrostatic transmission, relief valve, or motion control linkage. The Transaxle section covers the HST structure, pump and motor, relief valves, and linkage.
Manual Section: 2 Transaxle p. 140Weak deck or collector lift
Slow or weak mower and grass collector lift traces to the hydraulic pump, control valve, or lift cylinders. The Hydraulic System section covers the circuit, pump, control valve, and cylinders.
Manual Section: 4 Hydraulic System p. 194Frequently Asked Questions
Which mowers does this manual cover?
It covers the Kubota GZD15 zero-turn mower in both GZD15-LD and GZD15-HD versions, powered by the Z602-GZD15 diesel engine. Both models share this 271 page workshop manual.
What is the mower blade torque and how do I service the deck?
The Mower section covers blade and gear box service with the mower blade screw tightening torque of 98 to 118 N·m and the deck level limits for checking cut quality. p. 255
Can it help with no-start and charging problems?
Yes. The Electrical System section covers the wiring diagram, starter, glow plug, safety switch, and charging system, including battery voltage checks for diagnosis. p. 223
Does it include engine specifications?
Yes. The Engine section provides servicing specifications such as compression pressure and valve clearance, plus checking, disassembly, and assembly for the Z602 diesel. p. 72
What format is this Kubota GZD15-LD manual in?
Immediate download of the full 271-page searchable Workshop Manual. Open it on a laptop at your desk or a phone out in the field.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Is the electrical system covered in this Kubota GZD15-LD Workshop Manual?
Included. The Kubota GZD15-LD, GZD15-HD Workshop Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
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