Cardone 21-123 Power Steering Pump

Cardone 21-123 Power Steering Pump

Restore steering assist with this remanufactured Cardone power steering pump, engineered to meet or exceed original equipment performance. Built for select Mercedes-Benz GL320, ML320, and R320 applications, Cardone 21-123 is tested for hydraulic efficiency, pressure, flow, valve operation, and noise before it leaves the remanufacturing process.

The Cardone Power Steering Pump line focuses on OE-style fit and function with upgraded wear components where applicable. This remanufactured unit uses new O-rings, premium HNBR seals, and calibrated pressure relief valves to support dependable operation in demanding steering systems.

Key Features

• Remanufactured OE-style power steering pump for precise vehicle fit
• Triple-tested critical components, including cam packs and spool valves
• Computer-tested final assembly for pressure, bypass, fluid flow, valve operation, steering effort, and noise
• 100% new O-rings and premium HNBR seals to help resist heat-related seal breakdown
• Surfaced shafts to precise specifications to reduce premature seal wear
• Hydraulic efficiency testing for consistent, long-lasting performance
• Aluminum housing with O-ring hose port type
• Remote reservoir design; reservoir not included

Detailed Description

Cardone 21-123 is a remanufactured power steering pump for 2007-2008 Mercedes-Benz ML320, 2007-2008 Mercedes-Benz R320, and 2007 or 2008 Mercedes-Benz GL320 applications, with the 2008 GL320 fitment limited to vehicles built before 02/19/2008. This part cross-references Mercedes-Benz 0044668301 for the same application. It is built to restore hydraulic steering performance with OE-style dimensions and tested internal components, making it a direct replacement choice for Mercedes-Benz GL320, ML320, and R320 steering repairs.

As a remanufactured original equipment part, this pump is processed to improve durability where possible while preserving factory fit. The unit includes a hydraulic pump, instruction sheet, and sealing kit. It uses a press-on pulley attachment type, a threaded outlet, a hose barb inlet attachment type, and a 16x1.5 outlet thread size.

What It Can Help Fix

• Hard steering at low engine speed
• Whining or noisy power steering pump operation
• Loss of steering assist after pump failure
• Fluid leakage from worn seals or O-rings
• Inconsistent hydraulic pressure or flow

Installation Notes and Tips

• Fits 2007 Mercedes-Benz GL320, N/A
• Fits 2008 Mercedes-Benz GL320, N/A, before 02/19/2008
• Fits 2007-2008 Mercedes-Benz ML320, N/A
• Fits 2007-2008 Mercedes-Benz R320, N/A
• Reservoir is not included; reuse or replace related components as needed
• For warranty purposes, install an in-line filter, use the suggested OE fluid, and flush the system
• If the original pulley has a loose fit after removal, replace the pulley
• If steering assist only returns at higher rpm, inspect the flow control valve and system contamination
• Check the steering gear and fluid condition if hard steering remains in one direction

Quality Assurance

Cardone remanufacturing reduces raw material and energy use compared with producing a new part, while still applying testing to critical internal components and the completed pump. Each unit is hydraulically efficiency-tested to verify reliable operation before release.