Overview
The Kubota ZD18, ZD21 and ZD28 mower workshop service manual provides detailed technical information for maintenance, troubleshooting, inspection and repair. The documentation covers engine servicing, hydrostatic transmission operation, front axle components, hydraulic systems, electrical equipment and rotary mower mechanisms, helping technicians locate the appropriate specifications and repair procedures.
The workshop reference includes scheduled maintenance checks, tightening torques, special service tools, component adjustments, troubleshooting procedures and disassembly instructions. Detailed technical sections address engine lubrication and cooling, transaxle operation, hydraulic lift controls, electrical starting and charging systems, and mower power transmission and lifting mechanisms.
Table of Contents
Kubota ZD18, ZD21, ZD28 Manual
- 01. Safety First
- Workshop safety information
- 02. Safety Decals
- 03. Specifications
- Machine technical specifications
- 04. Dimensions
- Machine dimensional information
- 05. General
- Machine identification
- General workshop and servicing precautions
- Handling precautions for electrical components and wiring
- Battery, fuse and connector handling
- Correct handling of circuit testers
- Recommended lubricants, fuel and coolant
- General tightening torque specifications
- Metric screw, bolt and nut tightening torques
- UNC and UNF fastener tightening torques
- Maintenance checklist
- Daily inspection and maintenance checks
- Initial 50-hour, 100-hour and 200-hour maintenance
- Periodic 50-hour and 100-hour maintenance
- Periodic 150-hour and 200-hour maintenance
- Periodic 400-hour maintenance
- Annual and two-year maintenance checks
- Additional maintenance information
- Special service tools for engine components
- Special service tools for machine components
- 06. Engine
- Engine troubleshooting and fault diagnosis
- Servicing specifications for D722-E-XFM5 and D782-E-XFM5 engines
- Servicing specifications for D1105-E-ZD engine
- Engine body technical specifications
- Lubricating system specifications
- Cooling system specifications
- Fuel system specifications
- Engine tightening torque specifications
- Engine separation procedures
- Engine disassembly and assembly
- Engine body checking and adjustment
- Engine body disassembly and reassembly
- Engine body servicing procedures
- Lubricating system checking and servicing
- Cooling system inspection and adjustment
- Cooling system disassembly and assembly
- Fuel system checking and adjustment
- Fuel system disassembly and assembly
- 07. Transaxle
- Transaxle structure and component arrangement
- Travelling system construction
- Hydrostatic transmission structure
- Hydrostatic pump and motor
- Transmission check valves
- Check and high-pressure relief valves
- Hydrostatic transmission oil flow
- Power train operation
- Transmission control linkage
- Final reduction gear section
- Power take-off (PTO) system
- Transaxle troubleshooting
- Transaxle servicing specifications
- Transmission tightening torques
- Transaxle checking and adjustment
- Transaxle separation procedures
- Transaxle disassembly and assembly
- Hydrostatic transmission servicing
- Transmission case servicing
- 08. Front Axle
- Front axle structure
- Front axle troubleshooting
- Front axle servicing specifications
- Front axle tightening torques
- Front axle checking and adjustment
- Front axle disassembly and assembly
- Front wheel and wheel bracket separation
- 09. Hydraulic System
- Hydraulic circuit arrangement
- Hydraulic pump
- Hydraulic control valve and valve adaptor
- Hydraulic lift cylinder
- Mower linkage mechanism
- Hydraulic system troubleshooting
- Hydraulic servicing specifications
- Hydraulic control valve, pump and cylinder checking
- Hydraulic component adjustments
- Hydraulic control valve, pump and cylinder disassembly and assembly
- Lift cylinder disassembly and assembly
- 10. Electrical System
- Electrical wiring diagrams
- Starting system structure and operation
- Starter motor
- Glow plug system
- Safety switches and limit switches
- Electric fuel pump
- Engine stop solenoid
- Charging system operation
- AC dynamo
- Voltage regulator
- Easy Checker indicator system
- Fuel quantity gauge
- Coolant temperature gauge
- Electrical system troubleshooting
- Electrical servicing specifications
- Electrical component tightening torques
- Battery checking and inspection
- Starting system checking and testing
- Starter disassembly and assembly
- Starting system servicing
- Charging system checking and inspection
- Charging system disassembly and assembly
- Charging system servicing procedures
- Lighting system checking
- Gauge checking and inspection
- 11. Rotary Mower
- Rotary mower power transmission
- Mower lifting mechanism
- Rotary mower troubleshooting
- Rotary mower servicing specifications
- Mower component tightening torques
- Rotary mower checking and adjustment
- Mower component disassembly and assembly
Engine Identification and Service Specifications
The engine chapter provides separate servicing specification tables for the D722-E-XFM5, D782-E-XFM5 and D1105-E-ZD engine configurations. These references include engine body, lubrication, cooling and fuel system specifications. Confirm the installed engine designation before selecting the corresponding inspection or servicing values.
The documentation also separates hydrostatic transaxle servicing from the rotary mower’s power transmission and lifting mechanisms. Consult the relevant system chapter when investigating travel performance, hydraulic lift operation or mower component faults.
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