FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly: Why These 18 Critical Parts Matter

Welcome to this critical technical guide on the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly. This is the complete “forward” or “middle” drive axle for the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This is the core component that makes the “6×4” drive system possible.

The FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly is a complex, “through-drive” axle. Its “logic” is to perform two functions simultaneously: first, it receives power from the main driveshaft and sends it to its own wheels via the ‘Half-Shafts’. Second, it passes that power *through* its differential carrier via the ‘Through-Shaft’ to the rearmost drive axle.

This in-depth guide is an essential resource for professional driveline technicians and parts specialists. We will deconstruct the entire FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly into its 18 serviceable components, including the main ‘Centre axle housing’, the ‘Left’ and ‘Right’ half-shafts, and the critical ‘Through-shaft’ bearing and seal assembly.

Core Component: The ‘Centre Axle Housing’ (2501010BA6T)

The foundation of the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly is the ‘Centre axle housing assembly’ (2501010BA6T). This is the main structural component, often called the “banjo” or “carrier.” It is a massive, high-strength casting, typically made of ductile cast iron, designed to handle the entire weight of the tractor’s rear and its cargo, as well as the immense torque loads from the driveline.

This housing performs three critical functions. First, it is the “skeleton” that provides the mounting points for the truck’s suspension. Second, it is the rigid “case” that holds the differential (the ring and pinion gearset) in perfect, precision-machined alignment. Third, it acts as the “axle tubes,” extending outwards to hold the wheel hub bearings.

A crack or bend in this FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly (e.g., from an impact or overloading) is a catastrophic, vehicle-ending failure. Its structural integrity is paramount.

The “Half-Shafts”: Left (2503081-A6T) & Right (2503082-A6T)

The “Half-Shafts” components of the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly are the ‘Centre axle left half-shaft’ (2503081-A6T) and the ‘Centre axle right half-shaft’ (2503082-A6T). These are the “axles” themselves. They are solid, forged shafts made from an incredibly tough and ductile steel alloy (like 4340 chromoly), designed to twist slightly under extreme torque without breaking.

These are **full-floating** axles. This is a critical design feature for a heavy-duty truck. In this system, the axle shafts “float” inside the housing. Their *only* job is to transmit torque from the differential to the wheels. They do *not* support the weight of the vehicle. The vehicle’s weight is supported by the ‘Centre axle housing assembly’ itself, via the large wheel hub bearings.

This “full-float” design means that if a FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly‘s shaft were to break, the wheel *will not fall off* the truck. The shafts are splined on their inner end (to engage with the differential’s “side gears”) and flanged on their outer end, where they are secured to the wheel hub by the 20 ‘Hex flange bolts’ (Q1851650TF2K). The reason for a separate “Left” and “Right” half-shaft is simply their different lengths to accommodate the central differential.

The “Through-Shaft Logic”: Powering the 6×4

The most critical “logic” of the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly is the “Through-Shaft.” This is what makes it a “centre” (or “middle”) axle. This system allows the main driveshaft to send power *through* this axle to the rearmost axle.

This is achieved with several key components:

• **’Through-shaft’ (2502161-A9T):** This is the main shaft that passes *through* the differential carrier, driven by the pinion.
• **’Centre axle output flange assembly’ (2502165-A6T):** This is the flange splined to the *end* of the through-shaft, where the inter-axle driveshaft (see assembly 326) connects.
• **’Tapered roller bearing assembly’ (2502040-A6T-C00):** This massive bearing supports the through-shaft, handling the immense radial and axial loads.

This bearing is held in place by the ‘Bearing cap-through-shaft’ (2502168K5H) and its ‘Gasket-bearing cap’ (2502169K5HB1). This entire sub-assembly is then sealed by the ‘Through-shaft oil seal assembly’ (2502170-A8T-C00) and its ‘O-ring’ (CQ7345475C), which are critical for preventing gear oil from leaking out the back of the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly. This “pass-through” design is the core of the 6×4 drivetrain’s logic.

Service, Sealing, and Fasteners

The FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly is designed for heavy-duty service. It includes three critical service plugs:

• **’Oil filler plug’ (2401051-A0R):** The “fill” and “level check” port.
• **’Inner hex tapered magnetic screw plug’ (T62104M):** The “drain” plug. Its magnet is a key diagnostic tool, as it traps metal particles from wear, indicating the health of the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly.
• **’Breather plug’ (T905):** This essential vent prevents pressure from building up in the housing as it heats, which would blow out the ‘Through-shaft oil seal’ (2502170-A8T-C00) and wheel seals.

The system is sealed with ‘Gasket rings’ (CQ72324T5) for the plugs. The entire assembly is held together with high-tensile fasteners. The 20 ‘Hex flange bolts’ (Q1851650TF2K) are for the axle shafts, while ‘Hex head bolts’ (CQ1501445), ‘Spring gaskets’ (Q40314), and the ‘Nut-pinion shaft bearing’ (2402071K5H) are used to secure the bearing caps and through-shaft flange. This robust hardware is essential for the reliability of the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly.

FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly Parts List

The following table provides the complete, detailed breakdown of all 18 components identified in the ‘Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly’ diagram for the FAW CA4251P66K24T1A3E5 tractor.

Technical Specifications and Assembly Context

The specifications for the FAW Centre Axle Housing, Half-Shafts And Through-Shaft Logical Assembly are defined by its complex, multi-part design as a load-bearing, “through-drive” axle.