Part of the Kubota Repair Manuals.
This Kubota Workshop Manual is the factory service reference for the ZD18, ZD21 and ZD28 zero turn mowers, including the ZD18F, ZD21F and ZD28F front discharge variants. It runs 263 pages and is built around Kubota's D722-E-XFM5 and D1105-E-ZD diesel engines.
Coverage takes in the whole machine: the engine, the transaxle with its hydrostatic transmission and PTO drive, the front axle, the hydraulic system, the electrical system with wiring diagrams, and the rotary mower deck. Each section pairs construction detail with troubleshooting, servicing specifications and tightening torques.
From a hydro drive that has gone weak to a deck that cuts unevenly or a diesel that is hard to start, the step by step procedures and factory specs let an owner or independent mechanic service these ZD zero turn mowers properly.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safty First | 3-5 | |
| Safety Decals | 6-11 | |
| Specification | 12-15 | Engine, Transmission, PTO, Mower, Dimensions, Weight |
| Dimensions | 16-17 | Overall Length, Overall Width, Overall Height, Wheel Base, Mower Deck Width |
| General | 18-63 | Identification, General Precautions, Lubricants, Fuel and Coolant, Tightening Torques, Maintenance Check List, Special Tools |
| 1.Engine | 64-142 | Notice |
| 2.Transaxle | 143-185 | Hydrostatic Transmission, Pump and Motor, Check Valve, Power Trains Operation, Control Linkage, PTO System |
| 3.Front Axle | 186-194 | Cap, Taper Roller Bearing, Wheel Bracket, Lift Up Adjuster, Front Axle, Center Pin |
| 4.Hydraulic System | 195-210 | Hydraulic Circuit, Hydraulic Pump, Hydraulic Control Valve, Lift Cylinder, Mower Linkage |
| 5.Electrical System | 211-245 | Wiring Diagram, Starting System, Charging System, Gauges |
| 6.Rotary Mower | 246-263 | PTO Shaft, Mower Belt, Mower Blades, Bevel Gear, Lift Cylinder |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| ZD18, ZD21 | ||
| Cooling System Capacity | 2.7 L (2.7 U.S.qts., 2.3 Imp.qts.) | p. 26 |
| ZD18 | ||
| Engine Oil Capacity, ZD18 | 3.2 L | p. 7 |
| ZD21 | ||
| Engine Oil Capacity, ZD21 | 3.5 L | p. 7 |
| ZD28 | ||
| Engine Oil Capacity, ZD28 | 3.4 L | p. 7 |
| All Models | ||
| Rear Axle Case Oil Capacity | 1.8 L each | p. 7 |
| Mower Gear Case Oil Capacity | 0.40 L | p. 7 |
| Engine Oil Change Interval | 50 hours | p. 11 |
| Front Tire Pressure | 207 kPa | p. 13 |
| Rear Tire Pressure | 140 kPa | p. 13 |
| General Tightening Torque (M8 x 1.25, SS400, S20C) | 17.7 to 22.5 N·m | p. 9 |
| Universal Joint Mounting Screw Torque | 26.0 to 28.0 N·m | p. 17 |
