Description

When your John Deere starts running rough, blowing black smoke, or getting harder to start, there’s a good chance one of your pencil injectors is giving up. These little guys are what deliver precisely metered diesel fuel into each cylinder, and when they get clogged or worn, your engine just can’t perform like it should. This replacement gets your 3020, 4000, 4020, 4040, or 4230 back to running smooth and strong.

What You’re Getting

Complete pencil-type injector assembly ready to install
Precision-engineered nozzle delivers proper fuel spray pattern for clean combustion
High-quality construction handles the demanding cycles of agricultural engines
Direct replacement for original John Deere injectors marked 18421, 18646, 18660, 18767, 18768, or 20494
Maintains proper fuel delivery under all operating conditions and loads

Built for Real Farm Work

This injector fits classic John Deere tractors powered by 400 Series diesel engines – the workhorses that built American agriculture. Your 3020 might be pulling a cultivator through corn stubble, your 4020 could be hauling grain wagons at harvest, or your 4040 might be running a big disc in heavy soil. These tractors also power combines like the 6600 and 7700, plus loader/backhoes from the 500 and 600 series that handle everything from digging post holes to loading hay.

Made to Last

Fuel injectors take a beating – they fire thousands of times per hour under tremendous pressure and heat. This replacement is built to handle those demanding conditions with quality materials that resist wear and coking. The precision manufacturing ensures consistent fuel atomization that promotes complete combustion and maximum power from every drop of diesel.

Good to Know

Installing fuel injectors requires attention to cleanliness – any dirt in the fuel system can damage expensive components. Have clean rags ready and work in a dust-free area if possible. Always replace fuel filters when installing new injectors, and consider having the entire set tested or replaced together for best performance. If you’re not comfortable with fuel system work, this is a job worth taking to your mechanic.