The steering and brake system allow you to control the movement of the tractor, while the fuel system helps ensure your tractor has enough fuel to operate. The engine, transmission, and drivetrain all work together to power the tractor, while the electrical system provides the necessary power to the other systems. The most essential parts of the La140 are:Įach of these parts contains various sub-systems and components and understanding how each works together is important when troubleshooting any issues. This guide will provide you with an overview of the John Deere La140 parts diagrams and the wiring involved.īefore diving into the specific details of your John Deere La140 parts diagram, let’s take a look at the overall components and their functions. Understanding the components of your tractor will also help you understand how it works and how to troubleshoot any issues that may arise. Whether you’re a new owner of a John Deere La140 or you’ve been an owner for years, understanding the wiring diagrams associated with your equipment can help you make informed and safe decisions about its maintenance. John Deere La140 Parts Diagram: All the Wiring You Need to Know