Overview
The Kubota ZD18F, ZD21F, ZD25F and ZD28F Mower Workshop Service Manual provides technical documentation for maintenance, troubleshooting, inspection and component repair of these Kubota riding mowers. The workshop reference covers engine systems, hydrostatic transmission (HST), transaxle, front axle, hydraulic equipment, electrical systems and rotary mower assemblies. Its technical sections provide servicing specifications, component checking, adjustment, disassembly, assembly and repair procedures for the covered equipment.
The documentation includes separate engine specifications for D722-E-XFM5, D782-E-XFM5 and D1105-E-ZD configurations, along with engine lubrication, cooling and fuel-system servicing. The transaxle section addresses hydrostatic pump and motor operation, hydraulic oil flow, pressure relief valves, final reduction gears and power take-off (PTO) components. Additional chapters cover hydraulic lift cylinders, mower linkage, electrical starting and charging systems, and rotary mower power transmission. General information provides maintenance schedules, tightening torques, lubricants and special service tools.
Notice: The Engine chapter contains separate servicing specifications for different engine configurations. Confirm the engine identification before applying inspection measurements, tightening specifications or repair procedures. The supplied chapter index does not establish which engine configuration is fitted to every covered mower model.
Table of Contents
Kubota ZD18F, ZD21F, ZD25F, ZD28F Manual
- 01. Information, Safety and Specifications
- Safety First and Workshop Safety Instructions
- Mower Safety Decals and Warning Labels
- Machine Technical Specifications
- Machine Dimensions
- 02. General Information and Maintenance
- Mower Identification
- General Workshop Precautions
- Electrical Wiring and Component Handling Precautions
- Battery, Fuse and Electrical Connector Handling
- Circuit Tester Precautions
- Lubricants, Fuel and Coolant Requirements
- General Fastener Tightening Torques
- Metric Screw, Bolt and Nut Specifications
- UNC and UNF Threaded Fastener Specifications
- Machine Maintenance Checklist
- Daily Inspection and Maintenance
- Initial 50-Hour Maintenance
- Initial 100-Hour Maintenance
- Initial 200-Hour Maintenance
- Periodic Maintenance — Every 50 Hours
- Periodic Maintenance — Every 100 Hours
- Periodic Maintenance — Every 150 Hours
- Periodic Maintenance — Every 200 Hours
- Periodic Maintenance — Every 400 Hours
- Annual Maintenance Requirements
- Two-Year Maintenance Requirements
- Additional Maintenance and Service Checks
- Special Service Tools for Engine Repair
- Special Service Tools for Machine Components
- 03. Engine — Inspection and Servicing
- Engine Troubleshooting
- Engine Body Specifications — D722-E-XFM5 and D782-E-XFM5
- Lubricating System Specifications — D722-E-XFM5 and D782-E-XFM5
- Cooling System Specifications — D722-E-XFM5 and D782-E-XFM5
- Fuel System Specifications — D722-E-XFM5 and D782-E-XFM5
- Engine Body Specifications — D1105-E-ZD
- Lubricating System Specifications — D1105-E-ZD
- Cooling System Specifications — D1105-E-ZD
- Fuel System Specifications — D1105-E-ZD
- Engine Tightening Torque Specifications
- Engine Separation and Removal
- Engine Body Checking and Adjustment
- Engine Body Disassembly and Assembly
- Engine Body Inspection and Servicing
- Engine Lubricating System Checking
- Lubricating System Component Servicing
- Engine Cooling System Checking and Adjustment
- Cooling System Disassembly and Assembly
- Engine Fuel System Checking and Adjustment
- Fuel System Disassembly and Assembly
- 04. Transaxle and Hydrostatic Transmission
- Transaxle Construction and Structure
- Travelling System Mechanism
- Hydrostatic Transmission (HST) Construction
- Hydrostatic Pump and Motor
- HST Check Valve
- HST Check and High-Pressure Relief Valve
- Hydrostatic Transmission Oil Flow
- Power Train Operating Principles
- Hydrostatic Transmission Control Linkage
- Final Reduction Gear Section
- Power Take-Off (PTO) System
- Transaxle Troubleshooting
- Transaxle Servicing Specifications
- Transaxle Tightening Torques
- Transaxle Checking and Adjustment
- Transaxle Separation and Removal
- Transaxle Disassembly and Assembly
- Hydrostatic Transmission Inspection and Servicing
- Transmission Case Inspection and Servicing
- 05. Front Axle — Inspection and Servicing
- Front Axle Construction
- Front Axle Troubleshooting
- Front Axle Servicing Specifications
- Front Axle Tightening Torques
- Front Axle Checking and Adjustment
- Front Wheel and Wheel Bracket Separation
- Front Axle Disassembly and Assembly
- 06. Hydraulic System and Mower Lift Linkage
- Hydraulic System Circuit Diagram
- Hydraulic Pump Construction
- Hydraulic Control Valve and Valve Adaptor
- Hydraulic Lift Cylinder
- Mower Lift Linkage Mechanism
- Hydraulic System Troubleshooting
- Hydraulic Servicing Specifications
- Hydraulic Control Valve Checking and Adjustment
- Hydraulic Pump Checking and Adjustment
- Hydraulic Cylinder Checking and Adjustment
- Hydraulic Control Valve, Pump and Cylinder Disassembly
- Hydraulic Control Valve, Pump and Cylinder Assembly
- Lift Cylinder Disassembly and Assembly
- 07. Electrical System and Diagnostics
- Mower Electrical Wiring Diagram
- Engine Starting System
- Starter Motor
- Engine Glow Plug
- Starting Safety Switch and Limit Switch
- Electric Fuel Pump
- Engine Stop Solenoid
- Battery Charging System
- AC Dynamo
- Voltage Regulator
- Easy Checker Monitoring System
- Fuel Quantity Gauge
- Coolant Temperature Gauge
- Electrical System Troubleshooting
- Electrical Servicing Specifications
- Electrical Tightening Torques
- Battery Inspection and Testing
- Starting System Checking
- Starting System Disassembly and Assembly
- Starting System Component Servicing
- Charging System Inspection
- Charging System Disassembly and Assembly
- Charging System Component Servicing
- Lighting System Checking
- Electrical Gauge Inspection
- 08. Rotary Mower — Mechanism and Servicing
- Rotary Mower Power Transmission
- Mower Lifting Mechanism
- Rotary Mower Troubleshooting
- Mower Servicing Specifications
- Mower Tightening Torques
- Mower Checking and Adjustment
- Rotary Mower Disassembly and Assembly
Engine Specification Groups and Hydrostatic Mower Drive Servicing
The Engine chapter distinguishes two sets of technical specifications: one covering the D722-E-XFM5 and D782-E-XFM5 engines, and another covering the D1105-E-ZD engine. These specifications include engine-body, lubrication, cooling and fuel-system measurements. Before inspecting internal engine components or performing adjustments, identify the installed engine and consult its corresponding service limits and repair procedures rather than applying measurements from another engine configuration.
The Transaxle chapter provides separate references for hydrostatic pump and motor operation, check valves, high-pressure relief, control linkage and final reduction gears. The Hydraulic System chapter documents the lift cylinder and mower linkage, while the Rotary Mower chapter covers power transmission, lifting mechanisms and mower component servicing. When investigating drive or mower-lifting problems, distinguish hydrostatic transmission faults from hydraulic lift and mower mechanism concerns before selecting the relevant inspection or disassembly procedure.
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