INTERCOOLER FOR JOHN DEERE 6320, 6420, AND 6420S

AL172218 Intercooler for John Deere 6320, 6420, and 6420S Tractors

The AL172218 intercooler is a replacement part designed for John Deere tractors in the 6320, 6420, and 6420S series. It is installed in the charge air system and is selected primarily by its part number. If you are replacing the entire unit, you may also want to include the compatible gasket L157267 to ensure a proper seal upon reassembly.

Role of the Intercooler in the Air System

In a turbocharged engine, the intercooler is the heat exchanger responsible for cooling the compressed air before it enters the engine. It is therefore part of the airflow path between the turbocharger and the engine. This component plays a key role in maintaining the proper condition of the pressurized intake system, and its replacement is typically necessary when the heat exchanger is damaged, warped, or leaking.

When searching for a part, it is important not to confuse the intercooler with the engine radiator or other cooling components. In this case, the part you are looking for is indeed an intercooler, identified by part number AL172218.

Part Number AL172218 and Compatible Gasket L157267

The part number is the primary selection criterion for this part. If your old intercooler has the same part number or if your maintenance manual specifies AL172218, you have a consistent basis for identification. This helps avoid mistakes when distinguishing between several similar versions of the same turbocharger assembly.

The product sheet also lists a compatible gasket, L157267. This reference is useful if you are replacing the intercooler and wish to reassemble it with a gasket suitable for this application. The gasket is not a variant of the intercooler: it is an associated component that must be verified separately depending on your specific repair.

Documented John Deere Applications

This intercooler is specified for explicitly documented John Deere tractors, including models 6320, 6420, and 6420S. This targeted application helps guide your search toward a part that fits specific machines, rather than a generic intercooler.

If you are working on one of these tractors, use the exact model of the machine and the part number of the removed part as your reference points. If there is a discrepancy between the identification on the tractor and the part number you are looking for, it is best to verify before ordering.

Useful Guidelines for Choosing the Right Part

Before replacing an intercooler, compare the part number installed on your machine, the tractor model, and the relevant section of the air circuit. This check is particularly useful when several similar part numbers are used depending on the application.

For a clean installation, also remember to check the condition of the mounting surfaces and associated sealing components. If you need a gasket as well, part number L157267 is the additional reference you should note. If in doubt, identifying the part by reference number remains the safest method for selecting the correct intercooler.

Compatibility by Brand and Series

John Deere · Tractor

• 6320
• 6420
• 6420S

JOHN DEERE

• INTERCOOLER

FAQ — Frequently Asked Questions

What is the purpose of an intercooler on a John Deere 6320, 6420, or 6420S?

An intercooler cools the charge air before it enters the engine. On this type of tractor, it is located in the air path between the turbocharger and the intake. It should be replaced when the heat exchanger is damaged or when it no longer seals properly.

Is part number AL172218 compatible with John Deere 6320, 6420, and 6420S tractors?

Yes, part number AL172218 is listed for John Deere 6320, 6420, and 6420S tractors. To ensure you select the correct part, always verify the part number on the removed component or in your maintenance manual before ordering a replacement intercooler.

What is the compatible gasket L157267 used for?

The L157267 gasket is the compatible gasket associated with this intercooler. It may be useful during reassembly if the seal needs to be replaced at the same time as the intercooler. Simply verify that your repair involves this specific connection point in the air circuit.

How can I confirm that I’m ordering the correct intercooler?

The main identifier is the part number AL172218. Next, verify the exact model of the machine—in this case, John Deere 6320, 6420, or 6420S—and then compare the general layout of the intercooler on your tractor. If you plan to reseal the connection, also note that the gasket matches part number L157267.

Original replacement part numbers and brand names are provided for comparison purposes only. This does not imply that these are original parts.