Part of the Kubota Repair Manuals.
This downloadable PDF is the factory Kubota Z122R workshop manual, 153 pages covering the Z122R-AU and Z122RKW-AU zero turn mowers. These machines run the air cooled Kawasaki GH739V petrol engine.
The manual covers the engine, the hydrostatic transaxle, front axle, lift system, the electrical system with wiring diagrams and safety switches, and the mower deck itself. You get structure descriptions, troubleshooting charts, servicing specifications, tightening torques, and checking and disassembly procedures for each system.
Owners and small engine mechanics can use it to trace no start and safety switch faults, service the transaxle, set the deck level, replace belts and blades, and keep the Kawasaki engine running right. Every procedure is tied to factory figures. View it on any device, or print the pages you need for the shop bench.
What's Inside This Kubota Z122R-AU, Z122RKW-AU Manual
| System | Pages | Key Topics |
|---|---|---|
| Record of Revisions | 3 | - |
| Information | 4-16 | - |
| General | 17-50 | Identification (Serial Number), Handling Precautions for Electrical Parts and Wiring, Battery, Fuse, Connector, Handling of Circuit Tester, Color of Wiring, Lubricants and Fuel |
| Engine | 51-67 | Fuel System, Fuel Line, Lubrication System |
| Transaxle | 68-91 | Hydraulic Circuit, External Components, Inner Components, Parking Brake |
| Front Axle | 92-98 | Separating Front Wheel and Wheel Bracket, Front Wheels Wander to Right or Left, Tightening Torques of Screws, Bolts and Nuts, Remove Wheel Bracket |
| Lift System | 99-105 | Removing Link Shafts, Mower Does Not Lift, Mower Does Not Lower, Tightening Torques of Screws, Bolts and Nuts, Removing the Mower, Removing Front Link Shaft, Removing Cam |
| Electrical System | 106-135 | Wiring Diagram, Start System and Opc, Safety Switches, Relay, Charging System, Hour Meter, Head Light and PTO Clutch, Troubleshooting |
| Mower | 136-153 | Power Transmission, Dismounting the Mower Deck, Disassembling the Mower, Blade Does Not Turn, Blade Speed Is Slow, Mower Is Not Lifted, Mower Belt Slipping, Discharge Chute Plugged |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel tank capacity | 12.2 L (3.22 U.S. gals, 2.68 Imp.gals) | p. 26 |
| Engine crankcase oil capacity | 2.1 L (2.2 U.S.qts, 1.8 Imp.qts) | p. 26 |
| Max engine power | 15.0 kW (21.5 HP) | p. 14 |
| Fuel tank capacity | 12.2 L (3.23 U.S. gals, 2.68 Imp. gals) | p. 14 |
| Engine crankcase capacity | 2.1 L (2.2 U.S. qts, 1.8 Imp. qts) | p. 14 |
| Transaxle oil capacity | 1.66 L (1.75 U.S. qts, 1.46 Imp. qts) | p. 14 |
| Front tire pressure | 170 kPa (24.7 psi) | p. 34 |
| Rear tire pressure | 83 kPa (12.0 psi) | p. 34 |
| Battery nominal voltage | 12V | p. 42 |
| Battery cold cranking amps | 300 A | p. 42 |
| Engine oil change interval | every 50 hours | p. 30 |
| Spark plug check interval | every 100 hours | p. 30 |
Kubota Z122R-AU, Z122RKW-AU Common Problems This Manual Covers
Mower deck cuts unevenly
An uneven cut or scalping usually means the deck is out of level or the blades are worn. The mower section gives blade height figures and the checks needed to set the deck right.
Manual Section: Mower p. 136Weak or uneven hydrostatic drive
Sluggish tracking or a machine that pulls to one side points to the hydrostatic transaxle. This section covers the internal components, troubleshooting, and servicing specifications.
Manual Section: Transaxle p. 68Electric PTO clutch will not engage
A blade drive that will not turn often traces to the electric PTO clutch or its wiring. The electrical section covers the PTO clutch circuit and troubleshooting.
Manual Section: Electrical System p. 106Engine will not start on the seat
A no start or a cut out when leaving the seat usually means a safety switch or the operator presence control. The electrical section maps the start system, OPC, and safety switches.
Manual Section: Electrical System p. 106Kawasaki engine runs rough
Rough running or fouling on the GH739V often comes down to the spark plugs or fuel system. The engine section covers the fuel and lubrication systems with servicing specifications.
Manual Section: Engine p. 51Front caster wheels wobble
Shimmy or wander at speed points to worn front caster bearings or brackets. The front axle section covers structure, troubleshooting, and the checks to make.
Manual Section: Front Axle p. 92Frequently Asked Questions
Which mowers and engine does this manual cover?
It covers the Kubota Z122R-AU and Z122RKW-AU zero turn mowers, which are powered by the air cooled Kawasaki GH739V petrol engine.
Does it include wiring diagrams and safety switch details?
Yes. The Electrical System section starting on page 106 has the wiring diagram, start system and OPC, safety switches, charging system, and PTO clutch circuit. p. 106
Does it cover the mower deck servicing?
Yes. The Mower section beginning on page 136 covers power transmission, troubleshooting, servicing specifications, tightening torques, and blade checks. p. 136
Do I get instant access to this Kubota Z122R-AU Workshop Manual?
It's a 153-page searchable PDF, available to download the moment you check out. Open it on a laptop, tablet, or phone and take it straight to the shop floor.
Is this Kubota Z122R-AU Workshop Manual printable?
Yes. Print as many copies as you like; there are no restrictions. Plenty of mechanics run off just the section they need and keep it at the bench.
Does this Kubota Z122R-AU Workshop Manual include the hydraulic layout?
Yes. The manual includes hydraulic circuit diagrams, system schematics, and component specifications with pressure ratings.
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