This maintenance manual provides comprehensive instructions for the service and repair of Meritor Front Non-Drive Steer Axles, including the MFS (New Meritor Front Steer) series and earlier models like the FF and FL series. These axles are designed for a wide range of load ratings from 6,000 lbs (2,724 kg) to 20,000 lbs (9,080 kg).

1. Axle Identification and Nomenclature

The manual utilizes a standardized model nomenclature to identify axle specifications:

MFS Series: Identified by the axle series (MFS), load rating (GAWR), beam/kingpin variation, and brake attachment.
Brake Types: Axles may be equipped with various brake configurations, denoted by letters such as C (Air Disc Brake), L (Q Plus Cam Brake), P (Cam-Master “P” series), or W (Cam-Master “W” series) .
Beam Variations: Variations include forged I-beams with straight or tapered kingpins using non-metallic, needle, or bronze bushings .

2. Technical Specifications

Key technical data and dimensions are provided for various axle models:

King Pin Intersection (KPI): Varies by model, ranging from 65.25 inches (1657.4 mm) to 80.0 inches (2032.0 mm).
Axle Beam Drop: Standard drops include 3.5, 3.74, and 5.0 inches, providing flexibility for vehicle chassis height requirements.
Wheel-End Series: Categorized into four series (A, B, C, D) based on the hub (Conventional or Unitized) and knuckle design (Standard or Integral Tie Rod).

3. Core Component Variations

The manual details several engineering variations used across different production years:

Major Variations: Includes pre-FMVSS-121 designs, sealed kingpin construction, Easy Steer® designs, and unitized axle designs.
Design Variations: Differentiates between tapered and straight kingpins, special tie rods, and specific drop dimensions from the center of the spindle to the pad .
Double Drop Beams: Specific configurations for 12,000 lbs and 13,200 lbs GAWR axles .

4. Application Guidelines

Approval Required: All axle installations and applications must be approved by ArvinMeritor engineering; failure to obtain approval can void the warranty .
Service Factors: Capacity ratings vary based on tire size, transmission, engine power, duty cycle, and route terrain.
Rescue Applications: Only specifically listed products are approved for use in rescue vehicle applications.