This is the Garrett 409250-5002S, a new T04B15 turbocharger, not a rebuild, for the John Deere 404 cubic inch (6.6L) six-cylinder turbo diesel. Catalogs call the engine 6404T, and some print 6406T. It is the service number for the original Garrett 409250-0002 and it replaces John Deere AR58756, AR63779 and AR70987. Catalogs list it for the 4320, 4430, 4520, 4620 and 7020 tractors, the 6602 and 7700 combines, the 5200 forage harvester, the 644 and 644A loaders and the 690, 690A and 690B excavators. More than one turbo was used on this engine, so match the number on your old turbo before you order.

On an engine this age the usual reasons to change the turbo are oil leaking into the intake or exhaust side, low boost and black smoke under load, a noisy or dragging shaft, or a unit that has sat and seized. Check the oil feed and drain lines and the air cleaner before you fit the new one. A plugged drain or a dusty intake will take out a new turbo fast.

Specifications

Fits / Applications

• John Deere 404 cubic inch (6.6L) six-cylinder turbo diesel, engine 6404T (also printed 6406T)
• John Deere 4320, 4430, 4520, 4620 and 7020 tractors
• John Deere 6602 and 7700 combines and 5200 forage harvester
• John Deere 644 and 644A loaders and 690, 690A and 690B excavators
• Also listed for some International DT-358 (6358T) engines
• More than one turbo was used on these machines. Match the number on your old turbo tag before ordering

Change the engine oil and filter, clean or replace the oil feed and drain lines, and prime the turbo with clean engine oil through the oil inlet before the first start. Compare the oil connections and the mounting with your old turbo before you bolt it on. Service the air cleaner and check the intake piping for dust leaks.

Part Numbers & Cross Reference

Garrett 409250-5002S  ·  Garrett original numbers 409250-0002, 409250-0001  ·  Other Garrett numbers in the family 409250-5001S, 409250-9001S, 409250-9002  ·  John Deere AR58756, AR63779, AR70987, AR70989, AR54931  ·  John Deere number of the Schwitzer 3LD version AR53752  ·  Garrett cartridge (CHRA) 408105-0261

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

What does the Garrett 409250-5002S fit?

It fits the John Deere 404 cubic inch (6.6L) turbo diesel, engine 6404T. Catalogs list it for the 4320, 4430, 4520, 4620 and 7020 tractors, the 6602 and 7700 combines, the 644 and 644A loaders and the 690 series excavators.

Is 409250-5002S the same as Garrett 409250-0002?

Yes. 409250-5002S is the Garrett service number for the original 409250-0002, a T04B15 turbocharger.

What John Deere numbers does it replace?

It replaces John Deere AR58756, AR63779 and AR70987. Catalogs also show AR70989 and AR54931. Call 530-668-0818 with your number and we will check it.

My engine is listed as a 6406T. Is that the same engine?

Catalogs use both 6404T and 6406T for the same 6.6L John Deere six and list this turbo under both. Send us your engine serial number and we will confirm the turbo before you order.

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.