Air Spring 4X MVPTruckParts Trailer for Hendrickson W01-358-9978

Description

Product Overview

The 4X MVPTruckParts Air Spring is a premium‑grade component built for demanding trailer applications. Each spring incorporates 4140 grade steel studs that have been heat‑treated to achieve a 30 % increase in durability over standard alloys. The pistons are formed from an advanced composite material that has passed rigorous leak‑proof testing, ensuring a virtually zero‑loss rate even under extreme temperature fluctuations. With a rubber thickness of 5 mm, the spring exceeds typical industry specifications, providing a smoother ride and reducing wear on the chassis.

Designed as a direct‑fit replacement, this air spring matches the specifications of the Hendrickson W01‑358‑9978, C‑28929, and S‑28929 part numbers, eliminating the need for modifications or additional hardware. The part number is permanently engraved on the spring body for quick identification during service or inventory checks. At a weight of 44 pounds, the unit balances robust construction with manageable handling for installation crews.

Usage

This air spring is engineered for a wide range of commercial and industrial trailer uses. Whether you operate a long‑haul freight line, a regional delivery fleet, or a specialized off‑road equipment carrier, the spring’s high‑load capacity and leak‑proof design ensure consistent performance. The 3‑year unlimited mileage warranty provides peace of mind for operators who log thousands of miles each month, making it an ideal choice for high‑utilization scenarios.

Installation is straightforward for qualified technicians: the spring bolts directly onto the existing mounting points, and the integrated valve system allows for rapid pressurization and adjustment. The spring’s robust construction also makes it suitable for harsh environments, including exposure to dust, moisture, and temperature extremes commonly encountered in construction sites, agricultural fields, and desert transport routes.

Why Choose Us

MVPTruckParts stands out in the market by offering the industry’s first three‑year unlimited mileage warranty on rolling‑lobe and reversible‑sleeve air springs. This commitment reflects confidence in the product’s engineering, material selection, and manufacturing precision. Each spring undergoes a multi‑stage quality assurance process, including stress testing, leak detection, and dimensional verification, to guarantee that it meets or exceeds OEM standards.

Our customer support team provides dedicated assistance throughout the product lifecycle. From pre‑purchase part verification to post‑installation troubleshooting, we ensure that you receive accurate information and timely solutions. The combination of premium materials, rigorous testing, and a comprehensive warranty makes MVPTruckParts the trusted partner for fleet managers seeking long‑term reliability.

Key Features

• 4140 grade steel studs deliver 30% greater durability for demanding loads
• 5 mm thick leak‑proof rubber reduces maintenance and extends service life
• Direct‑fit design matches Hendrickson W01‑358‑9978 specifications, eliminating retrofit needs
• Three‑year unlimited mileage warranty provides unmatched peace of mind
• Dedicated MVPTruckParts support ensures expert assistance from purchase to after‑sales

FAQ

What vehicles are compatible with this air spring?

This spring is a direct replacement for Hendrickson part numbers W01‑358‑9978, C‑28929, and S‑28929. It fits most trailers that originally used those OEM springs, including many commercial freight and utility trailers.

How does the three‑year unlimited mileage warranty work?

The warranty covers any manufacturing defects and premature wear for an unlimited number of miles over three years from the date of purchase. If a defect is identified, MVPTruckParts will provide a replacement spring at no cost, provided the installation followed the recommended procedures.

Can the spring be adjusted for different load capacities?

Yes. The spring includes an integrated valve that allows technicians to fine‑tune air pressure to match specific load requirements. Adjustments should be made according to the vehicle’s load chart and verified with a pressure gauge.

Is professional installation required?

While the spring is designed for a straightforward bolt‑on installation, we recommend that a qualified technician perform the fit‑ment. Proper torque settings and air pressure calibration are essential for optimal performance and warranty compliance.

What maintenance is required to keep the spring performing optimally?

Regular visual inspections for signs of wear, checking the air pressure at recommended intervals, and ensuring the mounting bolts remain torqued to specification will help maintain performance. The leak‑proof rubber construction minimizes the need for frequent servicing.