Part of the Kubota Repair Manuals.
This Kubota Service Manual covers the Z231BR-AU, Z231KH-AU, Z251BR-AU, and Z251KH-AU zero-turn mowers sold in Australia, running the GH731V-1, GH736V, GH733V-1, and GH750V engines. It is a 188 page PDF you download and keep for the life of the machine.
After the safety and general sections, with product identification and full tightening torque tables, it moves through maintenance and service intervals, then the engine, transaxle, front axle, lift system, electrical system, and mower deck. Each mechanical section separates how the part works from how to service it.
Use it to set the electric PTO clutch clearance, service the hydrostatic transaxle, trace electrical faults, replace blades to the correct torque, and keep the mower on its factory service schedule.
Complete the set for your Z231–Z251 Series
- Operator Manual: Kubota Z231–Z251 Series Zero Turn Mower Operator Manual
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Supplementary Information | 3 | Model Name and Related Manuals, Model Name, Record of Revisions, Main Revised Point and Corrective Measure |
| Record of Revisions | 4-10 | Main Revised Point and Corrective Measure, Last Digit of the Code No, Month of Revision, Reference Page |
| Safety | 11-21 | |
| General | 22-44 | Tightening Torques (Stud Bolts, Hydraulic Fittings, Metric Screws, Bolts and Nuts, American Standard Screws, Bolts and Nuts with Unc or Unf Threads, Plugs), Product Identification |
| Maintenance | 45-75 | Lubricants and Fuel, Service Intervals |
| Engine | 76-94 | Z231KH-Au (GH736V), Z251KH-Au (GH750V) Kohler Engine, Z231BR-Au (GH731V-1), Fuel System |
| Transaxle | 95-127 | Hydraulic Circuit of Transaxle, Transaxle External Components, Fan Function, Pulley Function |
| Front Axle | 128-134 | Troubleshooting, Tightening Torques, Separating Front Wheel and Wheel Bracket, Removing Front Wheel, Removing Wheel Bracket |
| Lift System | 135-143 | Troubleshooting, Tightening Torques, Checking Link Stopper, Adjusting Link Stopper, Removing Link Shafts, Removing Mower |
| Electrical System | 144-166 | Wiring Diagram, Starting System, Electrical Circuit of Starting System, Safety Switch, Property of Safety Switch |
| Mower | 167-188 | Power Transmission Flow for Mower, Troubleshooting, Servicing Specifications, Tightening Torques, Leveling Mower Deck, Adjusting Anti-Scalp Rollers |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Engine crankcase oil capacity (with filter) | 1.8 L | p. 46 |
| Transmission case fluid capacity (with filter, hose and tank) | 4.8 L | p. 46 |
| Flange bolt (Electric clutch) torque | 62.8 N·m | p. 86 |
| Hub retaining nut torque | 109 N·m | p. 105 |
| Blade bolt torque | 103 N·m | p. 175 |
| Front tire inflation pressure | 170 kPa (25 psi) | p. 55 |
| Rear tire inflation pressure | 110 kPa (16 psi) | p. 55 |
| Electric PTO clutch clearance | 0.35 mm | p. 156 |
| Z231BR-AU | ||
| Max. engine power (Gross), Z231BR-AU | 16.4 kw (22.0 HP) | p. 31 |
| Z231KH-AU | ||
| Max. engine power (Gross), Z231KH-AU | 15.7 kw (21.0 HP) | p. 31 |
