This is the Bosch 0986445021, an electronic unit pump remanufactured by Bosch for the Mercedes-Benz MBE900 engine family. Each cylinder has its own pump in the block, driven by the camshaft and feeding one injector through a short high-pressure line. It replaces Mercedes A0280749102 and Detroit Diesel RA0280749102, and the new Bosch versions are 0414799017 and 0414799043. This listing is for one pump, and a refundable core applies.

A single-cylinder miss, a cylinder cutout that points at one hole, fuel in the oil from worn pump seals or a solenoid fault code are the usual reasons a unit pump is changed. The MBE900 used more than one unit pump. The other common one is Bosch 0986445103 (Mercedes A0280746902), and the two are not the same part, so order by the number on your old pump.

Specifications

Fits / Applications

• Mercedes-Benz MBE900 engines that carry unit pump Mercedes A0280749102 or Bosch 0414799017 or 0414799043
• Detroit Diesel branded MBE900 engines where the pump is listed as RA0280749102
• One pump per cylinder. Check the number on the old pump before you order.

Fit new O-rings and oil them before the pump goes into the block, and torque the high-pressure line to the Mercedes figure. After a unit pump is changed, follow the Mercedes or Detroit service procedure for the engine controller, including the pump classification code where the controller asks for one.

Part Numbers & Cross Reference

Bosch 0986445021  ·  Bosch new version 0414799017  ·  Bosch new version 0414799043  ·  Mercedes-Benz A0280749102  ·  Mercedes-Benz A0290742302  ·  Detroit Diesel RA0280749102  ·  Bosch F00E200412

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 Bosch 0986445021 fit?

Mercedes-Benz MBE900 engines whose original unit pump is Mercedes A0280749102, Detroit Diesel RA0280749102 or Bosch 0414799017. The number is on the pump body.

Can I use it in place of a 0986445103?

No. The 0986445103 replaces Mercedes A0280746902 and Bosch 0414799008. They are different unit pumps for the same engine family.

Is it new or remanufactured, and is there a core?

It is remanufactured by Bosch, and a refundable core applies. The new Bosch versions are 0414799017 and 0414799043.

How do I know which MBE900 pump my engine has?

Read the Mercedes A number or the Bosch number off one of your pumps, or call 530-668-0818 with the engine serial number.

Related Parts

• Detroit Diesel DD13 12.8L GHG17 Common-Rail Fuel Injector | Bosch 0986435741 Remanufactured
• Mack Diesel Engine Fuel Injector Nozzle & Holder Assembly (736GB421M2) | Bosch 0432191273 New
• Mechanical Diesel Injector Testing & 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.