Mercedes-Benz Vito W639 / Viano Cremallera hidráulica

Mercedes-Benz Vito W639 Hydraulic Power Steering Rack

The hydraulic power steering rack for Mercedes-Benz Vito W639 provides reliable steering assistance for this versatile mid-size commercial van. The W639 platform, produced from 2003 to 2014, was widely adopted across European and global markets for commercial transport, passenger carrying, and specialized body conversions.

This steering rack is engineered to match the W639 steering geometry and hydraulic system specifications. It delivers consistent power steering assistance that makes the Vito easy to maneuver in urban environments while providing stable, confident handling at highway speeds, whether the vehicle is empty or fully loaded.

W639 Platform Steering Architecture

The W639 Vito uses a rack and pinion steering system with hydraulic power assistance. The steering rack is mounted on the front subframe and connects to the front wheel hubs through tie rod ends. The hydraulic circuit includes a vane-type pump driven by the engine serpentine belt, a fluid reservoir, and high-pressure and return lines connecting the pump to the rack.

The W639 steering system was designed for durability in commercial service, with the rack housing featuring integrated mounting points that distribute loads evenly across the subframe. The internal valve assembly provides speed-sensitive steering feel that balances easy low-speed maneuvering with appropriate highway stability.

Seal Technology and Leak Prevention

Steering rack leaks are a common concern on aging W639 Vito models, particularly those that have accumulated high mileage in commercial service. The seals within the rack are subject to wear from constant hydraulic pressure cycling, temperature variations, and contamination from road debris that may enter through damaged boots.

This replacement rack incorporates advanced seal materials that resist degradation from heat, pressure, and chemical exposure. The rack boots are manufactured from durable rubber compounds that maintain flexibility across a wide temperature range, protecting the internal components from contamination and extending the service life of the seals.

Compatibility with Vito Variants

The W639 Vito was produced in multiple configurations including panel van, crew bus, and mixto variants with different wheelbases and gross vehicle weights. This steering rack is compatible with the standard W639 steering configuration used across these variants, but it is important to verify fitment against your specific vehicle specifications before ordering.

Engine variants including the 109 CDI, 111 CDI, 115 CDI, 120 CDI, and petrol models all use the same steering rack within the W639 range. However, vehicles with special steering modifications or aftermarket systems may require different components. Consult with our technical team if you have any doubts about compatibility.

Installation Tips for W639 Vito

When replacing the steering rack on a W639 Vito, begin by raising the vehicle and securing it on jack stands. Remove the front wheels and disconnect the tie rod ends from the steering knuckles. Access the steering rack mounting bolts from below, noting the position of any brackets or heat shields that may need to be removed for access.

Before installing the new rack, compare it with the removed unit to verify identical mounting points, port locations, and input shaft configuration. Apply thread locker to mounting bolts and torque to specification. After connecting hydraulic lines and tie rods, bleed the system and perform a four-wheel alignment to correct any toe angle changes from the replacement process.

KITLAMT Steering Solutions for Mercedes Vans

KITLAMT offers a comprehensive range of steering components for Mercedes-Benz commercial vehicles including the Vito, Sprinter, and Viano. Our products are sourced from quality-controlled manufacturing facilities and undergo individual testing before dispatch. We understand the importance of reliable steering for commercial vehicles and stand behind our products with responsive customer service.

Order your W639 Vito steering rack from KITLAMT for fast delivery and competitive pricing. We ship worldwide and offer technical support to assist with fitment verification and installation queries. Fleet operators and trade customers can access preferential pricing by contacting our sales team directly.