Overview
The Kubota ZD21N, ZD21 and ZD28 Zero-Turn Mower Workshop Service Manual provides technical documentation for maintenance, troubleshooting, inspection and component repair of the covered Kubota mowers. The workshop reference addresses mechanical construction, operating principles, general maintenance precautions and servicing procedures to support the diagnosis and repair of applicable machine components.
The documentation is organised into Mechanism and Disassembly and Servicing sections, separating component construction and operation from practical repair information. The servicing material covers troubleshooting, technical specifications, component checking, adjustment, disassembly, assembly and inspection procedures. Engine component inspection references include valve-spring load checking, with the applicable test methods and service criteria used to evaluate component condition.
Table of Contents
Kubota ZD21N, ZD21, ZD28 Manual
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01. Mechanism
- Component Construction and Arrangement
- Mechanical Operating Principles
- Functions of Covered Mower Components
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02. Disassembly and Servicing
- General Workshop Precautions
- Maintenance and Inspection References
- System and Component Troubleshooting
- Technical Service Specifications
- Component Checking and Adjustment
- Disassembly Procedures
- Component Assembly and Reassembly
- Component Inspection and Servicing
- Valve-Spring Load Inspection
Valve-Spring Load Testing and Component Inspection
The workshop servicing information includes valve-spring load checking as part of engine component inspection. Spring condition should be evaluated using the specified testing method and applicable service criteria. Free-length measurements and spring-load measurements assess different characteristics and should not be treated as interchangeable inspection results.
When evaluating mechanical components, refer to the relevant servicing specifications and inspection procedures before determining whether adjustment, repair or replacement is necessary. The Mechanism section provides supporting information about component construction and operation, while the Disassembly and Servicing section addresses the associated inspection and repair requirements.
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