FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock: A Critical Analysis of 34 Components

Welcome to this critical analysis of the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly (Part No. 2502010QA6T). This is the complete “forward” or “centre” drive axle differential carrier for the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor.

The FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly is the “brain” of the 6×4 drive system. Its “logic” is twofold: first, the ‘Inter-Shaft Differential’ (轴间差速器) splits power between the front and rear drive axles. Second, the ‘Differential Lock’ provides a pneumatic, driver-controlled mechanism to *override* this logic for maximum traction.

This in-depth guide is essential for driveline technicians. We will deconstruct the entire FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly into its 34 serviceable components, including the main ‘Housing’, the ‘Active Cylindrical Gears’ (pinion and side gears), and the complete ‘Differential Lock Logic Assembly’.

The “Housing” and “Drive Bevel Gear” (Pinion)

The FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly is a complete “carrier” or “pumpkin” unit. The ‘Housing’ (2502015-A6T / 2502018-A6T from the sub-list) is the massive, ribbed cast-iron foundation that holds all components in perfect, micromillimeter alignment.

The ‘Drive Bevel Gear’ component is the ‘Pinion shaft assembly’ (2502065-A6T). This is the “input” shaft, which receives power from the main driveshaft. It is supported by two massive ‘Tapered roller bearing assembly’ units (2402060-A8T-C00 and 2402050-A8T-C00). These bearings are critical, as they must handle both the extreme radial load and the axial (thrust) load from the helical gear mesh.

This pinion shaft is sealed by the ‘Centre axle input shaft oil seal assy’ (2502055-A6T-C00), which prevents gear oil from leaking out the front. The ‘Nut-pinion shaft bearing’ (2402069-A0E) is the critical fastener that sets the “preload” on these bearings. This preload is a precise “squeeze” set by the technician using the “as needed” (按需) ‘Adjustment gaskets’ (2402097-A6T, 2402098-A6T, 2402099-A6T). An incorrect preload on the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly will lead to rapid bearing failure.

The “Shaft Differential” (Inter-Axle Differential Logic)

This component is often mistaken, but the “Shaft Differential” (轴间差速器) in the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly is the **Inter-Axle Differential**. Its logic is to split power *between* the front-drive-axle and the rear-drive-axle.

This differential is a planetary gearset housed inside the ‘Inter-axle differential housing’ (2502105-A6T). It consists of:

• **’Planetary gear-inter-axle differential’ (2507076-A0E) – 4 units:** These are the “spider gears.”
• **’Inter-axle differential cross’ (2507081-A6T):** The “cross” that holds the spider gears.
• **’Front side gear-inter-axle differential’ (2507057-A6T):** This gear sends power to the centre axle’s own ring gear.
• **’Rear side gear-inter-axle differential’ (2507066-A6T):** This gear sends power to the “through-shaft” (2502136-A6T), which leads to the rear-most axle.

When the truck turns, the front and rear axles travel different distances. This differential “logic” allows the ‘Front side gear’ and ‘Rear side gear’ to spin at different speeds, preventing “driveline bind-up” and saving the axles from immense stress. This is a core function of the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly.

The “Differential Lock Logic Assembly”

The “Differential Lock Logic Assembly” is the system that *overrides* the inter-axle differential. In low-traction (mud, snow, or ice), allowing the front and rear axles to spin at different speeds is a weakness. The driver needs to “lock” them together. This FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly uses a pneumatic (air-powered) system.

When the driver flips the “Inter-Axle Lock” switch, high-pressure air is sent to the ‘Air cylinder-inter wheel diff lock’ (2406011-A0E) and ‘Air cylinder’ (2406016-A6T). This air pushes the ‘Piston-inter wheel differential lock’ (2406013-A0E).

The piston moves the ‘Fork assembly’ (2406025-A3C), which then pushes the ‘Sliding sleeve-inter-axle diff lock’ (2508032-A0E). This sleeve slides over and engages a set of “dog teeth,” physically locking the ‘Front side gear’ and ‘Rear side gear’ together. This forces both axles to spin at the same speed, providing a 50/50 torque split and maximum traction.

The ‘Return spring’ (2406028-A0E) disengages the lock when the air pressure is released. The ‘Inter-axle differential lock switch assembly’ (3834050-A0E) is the sensor that confirms the lock is engaged, turning on the dashboard indicator light. This pneumatic-mechanical “logic” is a critical feature of the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly.

The “Active Cylindrical Gears” and Bearings

The “Active Cylindrical Gears” from the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly keyword refers to the ‘Active cylindrical gear’ (2502136-A6T) and the planetary/side gear set. The ‘Active cylindrical gear’ is the main “through-shaft” that is locked to the ‘Rear side gear’ (2507066-A6T). It passes *through* the center of the ‘Pinion shaft’ (2502065-A6T), supported by the ‘Thrust needle bearing and holder assembly’ (AXK 80105).

This entire rotating assembly is supported by a series of ‘Cylindrical roller bearing assembly’ (2402075-A6T-C00) and ‘Tapered roller bearing assembly’ (2502050-A6T-C00) units. The ‘Adjustment gasket-reducer bearing’ (2403074-A9T, 2403072-A6T, 2403073-A6T) shims are used to precisely set the preload on these critical bearings.

This FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly is a complex, “gear-within-a-gear” system. The pinion shaft spins, the inter-axle differential spins inside it, and the “through-shaft” passes through the center of it all.

FAW…Differential Lock Logic Assembly Parts List (1/2)

The following table provides the first part of the detailed breakdown for the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly.

FAW…Differential Lock Logic Assembly Parts List (2/2)

This table details the remaining components for the FAW Gearbox Housing, Drive Bevel Gear, Inter-Wheel Differential And Differential Lock Logic Assembly.

Technical Specifications and Assembly Context

The specifications for the FAW Logic Assembly For Active Cylindrical Gears, Housing, Shaft Differential And Differential Lock Logic Assembly are defined by its complex, multi-part design for both gear reduction and traction control.