This is the Alliant Power D28485, a new pencil fuel injector, not a rebuild. It is Alliant Power’s own version of the Stanadyne 28485 and replaces John Deere RE36939. It is the injector for the turbocharged 4039T and 6059T engines of the later 300 Series build and the 4045T and 6068T that followed them, plus the 4045D. Tractors that use it include the 5400, 6200, 6300, 6400, 7200 and 7400. It is the turbo partner to the D28481.

A pencil injector that is worn or stuck shows up as a miss, white or black smoke, a fuel knock, hard starting or fuel wash on one cylinder. Pencil injectors for these engines look almost the same from one number to the next, but the nozzle and the opening pressure differ, so match the number stamped on the body of your old injector before you order. One injector per cylinder.

Specifications

Fits / Applications

• John Deere 4039T and 6059T engines, turbocharged
• John Deere 4045T and 6068T engines that use RE36939, and the 4045D
• John Deere 5400, 6200, 6300, 6400, 6500, 7200, 7400 and 7500 tractors
• Engines that use Stanadyne 28485 or John Deere RE36939. Match the number on your old injector.
• Naturally aspirated 3029D, 4039D, 6059D and 6068D engines take the D28481 instead
• One injector per cylinder

Pencil injectors seal on the tip and at the carbon stop seal, so clean the bore, fit new seals and tighten the clamp evenly to the John Deere figure. Do not bend the body or clamp it in a vise. Fit new leak-off boots or grommets if the old ones are hard.

Part Numbers & Cross Reference

Stanadyne (genuine version) 28485  ·  John Deere RE36939

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 is the difference between the D28485 and the D28481?

The D28485 is for the turbocharged 4039T, 6059T, 4045T and 6068T engines and replaces RE36939. The D28481 is for the naturally aspirated engines and replaces RE36935. They do not interchange.

Is the D28485 the same as the D27336?

No. The D27336 is the older 27336 type (RE37503) for engines such as the 3179T and 6359T. Go by the number on your old injector.

Is the D28485 a Stanadyne injector?

No. It is Alliant Power’s own new pencil injector, built as the Alliant Power version of Stanadyne 28485.

How do I confirm it fits my tractor or loader?

Read the number on the body of your old injector, or call 530-668-0818 with the engine model and serial number. It is new, so there is no core to return.

Related Parts

• John Deere 3029D, 4039D, 6059D & 6068D Non-Turbo Pencil Fuel Injector (RE36935) | Alliant Power D28481 New
• John Deere 4045H/T & 6068H/T Pencil Fuel Injector | Stanadyne 29279 New (RE48786)
• John Deere 4045H/T & 6068H/T PowerTech Pencil Fuel Injector | Alliant Power D29279 New (RE48786)
• John Deere 6068T & 6068D 6.8L DE10 Fuel Injection Pump | Stanadyne 06320 New (RE568067)
• Stanadyne DB2, DB4 & DB 310 Diesel Injection Pump Rebuild Service

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.

Not sure the injectors are the problem? We test and diagnose in-house before you buy. See our common rail injector testing and rebuild service.