Mercedes W251 Rear Tailgate Hydraulic Pump Trunk Boot Lid Motor Unit A2518001448

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 Mercedes vehicles with a hydraulically operated tailgate. This used component from the Tailgates and rear parts category allows for restoring the proper operation of the mechanism without the need for a costly replacement of the entire system.

Specifications and technical data

• SKU: A2518001448
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2518001448
• Substitutable numbers: A2518001448, A 251 800 14 48, A2518001848, A 251 800 18 48, A2518000097, A 251 800 00 97
• Location on the vehicle: Rear
• Category: Boot & Hatch Lids

Purpose and function of the hydraulic pump

The described pump is responsible for generating pressure in the tailgate hydraulic system, which enables its smooth lifting and lowering. The component is designed for installation in the rear of the vehicle, in the trunk area, where it works in conjunction with hydraulic lines, actuators, and electrical controls. Thanks to the proper selection of the component, it is possible to maintain the factory operating characteristics of the tailgate – both in terms of movement speed and operational smoothness.

Benefits of using an original pump in the Mercedes W251

Using a dedicated hydraulic pump in the W251 model ensures:

• compatibility with the factory tailgate control system,
• stable operation of the mechanism in the rear of the body,
• reduced risk of leaks and pressure drops in the system,
• easier diagnostics of potential future faults.

For the user, this means predictable tailgate operation, convenience in daily use, and the ability to use the cargo space without any issues.

Selection and compatibility regarding part numbers

The pump has an assigned OEM part number and a set of interchangeable numbers, which facilitates clear identification of the component in service catalogs and parts selection systems. When purchasing, it is worth comparing the markings with the vehicle data to confirm compatibility with the specific equipment version and tailgate system configuration. This minimizes the risk of installing a component with different operating characteristics or one intended for a different body configuration.

Installation and operational characteristics

The tailgate hydraulic pump is structurally adapted to operate in the rear of the vehicle, under conditions of variable temperature and exposure to vibrations. Installation takes place within the luggage compartment or its vicinity, using factory mounting points and original connectors. This used component allows for an economical repair of the system while maintaining proper functionality and compatibility with other system elements.

Rear vehicle zone and related components

The pump works with other components responsible for tailgate operation, such as actuators, hydraulic lines, valves, and control modules. Proper operation of the entire system requires a leak-free installation and correct bleeding after assembly. In the case of symptoms such as uneven lifting, the tailgate stopping halfway, or noise during operation, replacing the pump is one of the key diagnostic steps.

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

When working with used hydraulic components, it is worth knowing the basic principles of assessing their technical condition and signs of wear – you will find practical tips in the article How to buy a used car engine and not get scammed – a step-by-step guide, which discusses universal principles for the safe selection of used mechanical components.