The John Deere 316, 318, and 420 Lawn and Garden Tractors Service Technical Manual (TM1590) is a comprehensive resource for both experienced mechanics and DIY enthusiasts. This manual provides detailed instructions and high-quality diagrams for maintaining and repairing these popular John Deere tractors.

The manual covers a wide range of topics, including general information, engine repair, electrical repair, powertrain repair, steering and brake repair, hydraulic repair, miscellaneous repair, and detailed checkout and diagnosis sections for each system.

The manual is organized into sections and groups, making it easy to find the information you need. Each section includes detailed explanations, step-by-step instructions, and clear illustrations to guide you through every repair procedure.

The manual includes sections on:

* **General Information:** This section covers safety procedures, general specifications, repair specifications, test and adjustment specifications, fuels and lubricants, and serial number locations.
* **Engine Repair:** This section covers the engine, including disassembly, inspection, repair, and reassembly procedures.
* **Electrical Repair:** This section covers the electrical system, including the front PTO clutch, troubleshooting, and repair of electrical components.
* **Powertrain Repair:** This section covers the transmission, transmission control linkage, differential, rear axles, and drive shaft.
* **Steering and Brake Repair:** This section covers the steering system for the 316, 318, and 420 models, as well as the brakes.
* **Hydraulic Repair:** This section covers the hydraulic control valve.
* **Miscellaneous Repair:** This section covers the front axle, mower spindle and jack sheave repair, and mower gear case repair.
* **Engine, Fuel and Air System Checkout and Diagnosis:** This section covers checkout, diagnosis, tests, and adjustments for the engine, fuel, and air systems.
* **Electrical Checkout, Operation, and Diagnosis:** This section covers electrical system checkout, electrical schematics, component location and operation, electrical system diagnosis, and component tests and adjustments.
* **Power Train Checkout, Operation, and Diagnosis:** This section covers powertrain checkout, theory of operation, diagnosis, tests, and adjustments.
* **Steering and Brakes Checkout, Operation, and Diagnosis:** This section covers steering and brakes system checkout, theory of operation, diagnosis, tests, and adjustments.
* **Hydraulic System Checkout, Operation, and Diagnosis:** This section covers hydraulic system checkout, hydraulic schematics, theory of operation, diagnosis, tests, and adjustments.
* **Dealer Fabricated Tools:** This section provides information on specialty tools that may be needed for certain repairs.
* **Index:** A comprehensive index makes it easy to find specific information within the manual.

The John Deere 316, 318, and 420 Lawn and Garden Tractors Service Technical Manual is an invaluable resource for anyone who wants to keep their tractor in top condition. With its thorough instructions and clear illustrations, this manual will help you perform any repair job confidently and efficiently.

The John Deere 316, 318, and 420 lawn and garden tractors represent a celebrated era of powerful and reliable mowing machines. Introduced in the 1970s and 80s, these tractors were designed to handle demanding landscaping tasks with ease. The 316, featuring a 16-horsepower engine, was a popular choice for homeowners with moderate-sized lawns. The 318, with its 18-horsepower engine, offered increased power for larger lawns and tougher mowing conditions. The 420, boasting a 20-horsepower engine, was the most powerful of the three, capable of handling even the most challenging terrain and thickest vegetation. All three models featured a robust cast iron front axle, ensuring durability and stability, even when navigating uneven ground. Their renowned reliability and smooth operation made them a favorite among discerning homeowners who valued both performance and longevity.

Beyond their impressive mowing capabilities, these tractors were lauded for their versatility. With the availability of a wide range of attachments, including snow blowers, tillers, and even a front-end loader, they transformed into all-season workhorses. The 316, 318, and 420 became synonymous with quality, performance, and dependability, solidifying John Deere's legacy as a leading manufacturer of lawn and garden equipment. Even today, these vintage tractors are highly sought after by collectors and enthusiasts who appreciate their robust construction, classic styling, and enduring value. The TM1590 service technical manual, a comprehensive resource packed with detailed diagrams, specifications, and troubleshooting guides, provides invaluable assistance to owners seeking to maintain and restore these remarkable machines to their former glory.