0414799008 Unit Pump | Bosch EUP For Mercedes-Benz OM900 Series

The 0414799008 is a Bosch electronic unit pump (EUP) engineered specifically for Mercedes-Benz OM900 series diesel engines. This precision component, also referenced by OE number 0280746902, functions as a combined high-pressure pump and injector unit-integrating the pumping element, solenoid valve, and nozzle into a single assembly mounted directly on the cylinder head. Designed for applications requiring sustained performance under heavy loads, the 0414799008 delivers fuel at the pressures and timing precision demanded by modern commercial vehicle operations. Its robust construction and electromagnetic control architecture make it a critical element for maintaining optimal combustion efficiency, emissions compliance, and operational reliability in the service bay.

Parameter	Specification
Part Number	0414799008 (0 414 799 008)
OE Cross-Reference	0280746902, 028074690280, 0260747302, 0270749202, 0280743202, 0280744802, 0280746002, A0280746902
Product Type	Electronic Unit Pump (EUP) / Unit Injector (UI)
Fuel Type	Diesel
Manufacturer	Bosch
Condition	New / OEM Remanufactured
Warranty	12-month industry-standard warranty

The 0414799008 is a direct replacement for unit pumps installed on a broad spectrum of Mercedes-Benz commercial vehicles and industrial equipment. Compatibility extends across multiple model series, including:

Mercedes-Benz ATEGO – Medium-duty distribution trucks

Mercedes-Benz VARIO – Heavy-duty vans and chassis-cabs (615 D, 616 D, 618 D, 818 D)

Mercedes-Benz MBE900 / OM900 Series – Engine families including OM904, OM906, OM926

This unit pump is compatible with engines ranging from approximately 112 kW to 130 kW output and is suitable for both on-road and off-road applications, including dump trucks and platform/chassis configurations . When ordering, always verify the OE number and engine serial to ensure correct fitment, as the 0414799008 is also superseded by or alternates with part numbers such as 0414799027 and 0986445103 in specific applications .

Proper installation of the 0414799008 extends beyond mechanical tightening; precise verification is essential to prevent post-repair drivability issues. Adhere to the following technical protocol during installation:

Plunger Lift Clearance: Measure the clearance between the tappet and the pump body using a feeler gauge. The acceptable tolerance is 0.025 – 0.045 mm. Exceeding 0.05 mm increases impact stress, while values below 0.02 mm risk seizure at operating temperature .

Solenoid Connector Resistance: Use a multimeter to verify the solenoid pin resistance reads within 2% of nominal. Significant deviations indicate internal winding damage or oxidation .

ECU Adaptation Reset: Following mechanical installation, a full reset of fuel trim values via diagnostic software (e.g., Bosch ESI[tronic]) is mandatory. Post-reset, perform an in-vehicle learn cycle with partial throttle accelerations under light load to ensure the ECU accepts the new pump's characteristics. Failure to reset adaptations frequently results in "rail pressure control deviation" fault codes (SPN 157, FMI 16), even with a perfectly functional unit pump .

Unlike common rail systems that generate pressure centrally, the Unit Injector System (UIS) equips each cylinder with an independent, high-pressure unit pump-offering distinct advantages in commercial diesel maintenance. The 0414799008 integrates directly with the engine's camshaft drive, eliminating the need for external high-pressure lines between a remote pump and injectors. This design reduces leak paths and contributes to a more compact engine package.

From a workshop perspective, the service value lies in targeted cylinder-level diagnostics. Because each cylinder operates with an independent unit pump, failures are localized and easier to isolate. Typical failure modes in these units include solenoid wear, plunger/barrel scoring from contaminated fuel, or harness connector degradation. Symptoms such as rough idle, misfiring under load, excessive black smoke, or increased fuel consumption often trace back to a failing unit pump . Replacement of the 0414799008 restores injection timing accuracy and combustion stability, directly improving engine power, fuel economy, and emissions performance. For fleets operating older engines, using a Bosch remanufactured unit pump provides an economical alternative to dealer pricing while ensuring components are rebuilt to OEM specifications with new internal parts .

Q1: Is 0414799008 interchangeable with 0414799027 or 0986445103?
A: Yes, these part numbers often cross-reference or supersede each other depending on the OEM supplier and application. However, always confirm compatibility by checking your original OE number (e.g., 0280746902) and engine serial. In some applications, 0414799027 is listed as a direct replacement for 0414799008 .

Q2: What are the common failure symptoms of this unit pump?
A: Look for fault codes related to cylinder balance, rough idle, power loss under load, increased fuel consumption, and excessive black smoke. A professional diagnostic test can confirm if the issue is injector-related versus an ECU or sensor fault .

Q3: Can I install the pump myself, or do I need a specialist?
A: Mechanical installation is straightforward, but proper diagnosis and ECU adaptation reset require professional diagnostic tools (e.g., Bosch ESI[tronic]). Without adaptation reset, the engine may run poorly and log persistent rail pressure fault codes .

Q4: How long does a remanufactured Bosch 0414799008 typically last?
A: Service life depends on fuel quality and maintenance intervals. With regular fuel filter changes and clean diesel, a Bosch remanufactured unit pump can achieve service life comparable to a new OEM unit, often exceeding 300,000 miles in on-highway applications.

Q5: Does this pump include a warranty?
A: Yes, reputable Bosch remanufactured parts typically include a 12-month industry-leading warranty covering defects in materials and workmanship . Always verify warranty terms with your supplier before purchase.

 

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