Mercedes W251 Rear Tailgate Hydraulic Pump Trunk Boot Lid Motor Unit A2518001148

Mercedes W251 Rear Tailgate Hydraulic Pump Trunk Boot Lid Motor Unit is a specialized component of the tailgate opening and closing system, designed for installation in the rear of the vehicle body. The original design, dedicated to Mercedes W251 series models, ensures proper compatibility with the vehicle's factory installation and stable operation of the tailgate lifting system. This is a solution for users who expect consistency with the factory comfort system and predictable operating parameters.

Specifications and technical data

• SKU: A2518001148
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2518001148
• Substitutable numbers: A2518001148, A 251 800 11 48, A2518001248, A 251 800 12 48
• Location on the vehicle: Rear
• Category: Boot & Hatch Lids

Purpose and function in the vehicle

The presented hydraulic unit is responsible for powering and controlling the mechanism for opening and closing the tailgate in the Mercedes W251. It is mounted in the rear area of the vehicle, where it works with hydraulic lines, actuators, and the comfort access control system for the luggage compartment.

This element is part of the Tailgates and rear components group, which means it has a direct impact on the convenience of daily use – from smooth tailgate lifting to controlled, even closing of the trunk lid.

Construction and integration with the vehicle system

The Mercedes W251 Rear Tailgate Hydraulic Pump Trunk Boot Lid Motor Unit has been designed as a complete drive unit that works with the factory control system. The design provides for:

• integration with the hydraulic system responsible for tailgate movement,
• compatibility with factory sensors and comfort controls,
• fitment to original mounting points in the rear of the body.

As a result, installation is based on the existing vehicle architecture, without the need to interfere with the body structure or modify the wiring.

Benefits of using the original hydraulic unit

Using the original rear tailgate hydraulic pump in a Mercedes W251 allows for maintaining the operating parameters specified by the vehicle manufacturer. In practice, this translates into:

• smooth and even opening of the tailgate while maintaining proper system pressure,
• stable closing of the lid without jerking or excessive mechanical stress,
• consistency with the factory safety and comfort system for the rear of the vehicle.

A used original part is also a favorable compromise between cost and maintaining the proper operating characteristics of the system, especially for vehicles used on a daily basis.

Selection by numbers and vehicle compatibility

The Mercedes W251 Rear Tailgate Hydraulic Pump Trunk Boot Lid Motor Unit belongs to a group of components where compliance with manufacturer markings is crucial. Proper selection by part number and interchangeable numbers helps avoid installation problems and ensures correct cooperation with the vehicle's electronics. It is worth verifying compatibility with your specific vehicle using OEM data and catalog information.

If you are planning a broader upgrade of the tailgate opening system – for example, along with replacing actuators, hinges, or mounting elements – consistent selection of components within the same Mercedes model platform helps reduce the risk of the entire system malfunctioning.

Expanding the tailgate system in a Mercedes

If you are planning a comprehensive repair or upgrade of the rear body area in your Mercedes and need other elements from the same group, such as tailgate hinges, actuators, or lid locks, check the available parts in the Mercedes Tailgates and rear components category.

Expert knowledge and purchasing used components

When choosing used drive and hydraulic system components, it is worth relying on reliable technical data and OEM number selection procedures. This helps reduce the risk of an incorrect purchase and ensures predictable component durability. For users who want to better understand the specifics of the used parts market and how to verify compatibility, our expert guide may be helpful: Why it is worth buying used gearboxes and engines – facts instead of myths.