FAW J6P Zhongqiao: Deconstructing 105 Critical Parts for Flawless Tandem-Axle Power

This is the definitive guide to the FAW J6P Zhongqiao (Middle Axle) for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This complete deconstruction analyzes 105 serviceable parts, providing a full service-level overview of this critical through-axle.

The FAW J6P Zhongqiao (Part No. 2500010AA6E) is the engineering core of the 6×4 tandem-axle system. It is not a simple axle; it is the ‘through-axle’ or ‘forward-axle’ of the pair. Its primary role is twofold: first, to receive power from the transmission and perform a main gear reduction (i=1.333), and second, to house the inter-axle differential, which splits power between the middle axle itself and the rearmost axle. This guide will explore the main reducer, the power divider, the wheel differential, and the dual-lock systems that make the FAW J6P Zhongqiao a robust, essential solution for heavy-haul applications.

Core 1: The “Input & Reducer” Logic (The Pinion Assembly)

This assembly receives power from the main driveshaft and performs the first stage of gear reduction (i=1.333) for the entire FAW J6P Zhongqiao. The precision of this setup dictates the axle’s lifespan.

1. Component: Bearing & Support Group (32315, 32314, 2502121-A0E)
The ‘Driven pinion’ (Comp 9, 2502036AA6E) is the main input gear. It is rigidly supported by a set of heavy-duty tapered roller bearings, including ‘32315’ (Comp 10) and ‘32314’ (Comp 17), which sit in the ‘Outer race’ (Comp 11). This Tapered Roller Logic allows the pinion to handle immense radial (sideways) and axial (thrust) forces generated by the helical-cut gears.

2. Component: ‘Adjustment shim-driven pinion’ (2402097~98-A0E) – Qty As Req.
This (Comp 8) is a set of precision shims, provided in thicknesses like 0.5mm, 0.15mm, and 0.10mm. The Pinion Pre-load Logic is a high-precision assembly task. These shims are used to set the precise rotating torque (pre-load) on the pinion bearings (Comp 10 & 17). This adjustment is critical to the service life of the FAW J6P Zhongqiao.

3. Component: Lubrication & Sealing Group (2509015-A0E, 2502055-A0E)
This group includes the ‘Filter-oil house assy’ (Comp 13), an internal filter screen that protects the gears and bearings from debris. It also includes the ‘Oil seal-driven pinion’ (Comp 65), ‘Dust cap’ (Comp 66), and ‘Flange-main reducer’ (Comp 68). This system keeps the gear oil clean, prevents leaks, and protects the input of the FAW J6P Zhongqiao.

Core 2: The “Inter-Axle Differential” Logic (Power Divider)

This is the ‘brain’ of the FAW J6P Zhongqiao. It is a differential *within* the axle that splits torque not between the wheels, but between the middle axle and the rear axle (the ‘through-axle’ function).

1. Component: ‘Inter-axle differential assy’ (2502105-A0E) – Qty 1
This (Comp 45) is the complete serviceable unit. It is built into the ‘Front case-inter-axle diff’ (Comp 46, 2507057-A0E) and ‘Rear case’ (Comp 50, 2507058-A0E), which are bolted together with 12 ‘Shim’ bolts (Comp 51). This entire unit manages the front-to-rear power split.

2. Component: ‘Cross-inter-axle diff’ (2507081-A0E) & ‘Planetary gear’ (2507076-A0E)
This (Comp 47 & 49) is the Planetary Logic of the power divider. The ‘Cross’ (spider) holds four ‘Planetary gears’, which are supported by ‘Shims’ (Comp 48). These gears are what allow the middle and rear axles to rotate at different speeds when cornering, preventing drivetrain binding. This is essential for the on-road handling of the FAW J6P Zhongqiao.

3. Component: ‘Driven pinion’ (2502108-A6E) & ‘Rear half shaft gear assy’ (2507065-A0E)
This (Comp 18 & 52) shows the power flow. The ‘Driven pinion’ (Comp 18) is the input gear for the inter-axle differential. The ‘Rear half shaft gear assy’ (Comp 52) is the output gear that sends power to this axle’s *own* wheel differential. The other output (Comp 76) sends power to the rear-most axle, completing the FAW J6P Zhongqiao through-axle design.

Core 3: The “Dual-Lock” Logic (Pneumatic Control)

The FAW J6P Zhongqiao features a sophisticated dual-locking system. It has one lock for the inter-axle differential (power divider) and another for its own wheel-to-wheel differential.

1. Component: Pneumatic Activation Group (Qty 2 of each)
The BOM shows ‘Qty 2’ for all pneumatic parts (Comp 30-39). This includes the ‘Switch assy-diff lock indicator’ (Comp 30), ‘Air cylinder’ (Comp 37, 2406011-A0E), ‘Piston’ (Comp 36, 2406013-A0E), and ‘O type ring’ (Comp 35, 2406014-A0E). This is because one set controls the inter-axle lock and the second set controls the wheel-axle lock on this FAW J6P Zhongqiao.

2. Component: Inter-Axle Lock Mechanism (Comp 40, 42)
The first air actuator (Comp 37) moves the ‘Fork-inter-axle diff lock’ (Comp 42, 2508024-A0E), which slides the ‘Sliding sleeve’ (Comp 40, 2508032-A0E) to lock the power divider. This forces a 50/50 power split between the middle and rear axles for extreme traction.

3. Component: Wheel-Axle Lock Mechanism (Comp 78, 80)
The second air actuator (the other Comp 37) moves the ‘Fork-wheel diff lock’ (Comp 78, 2406024-A0E), which slides its own ‘Sliding sleeve’ (Comp 80, 2406032-A0E). This locks the wheel differential (Comp A), forcing both wheels on the FAW J6P Zhongqiao to spin at the same speed.

Core 4: The “Wheel Differential” Logic (Torque to Wheels)

Separate from the power divider, the FAW J6P Zhongqiao contains a complete, conventional differential for splitting torque between its own left and right wheels.

1. Component: ‘Differential assy’ (2403015AA0E) – Qty 1
This (Comp A) is the complete wheel differential carrier. It is bolted to the ‘Driven pinion’ (Comp 93, 2403037BA0E), which is the main ring gear for the wheel differential. It is secured by 16 ‘Bolts’ (Comp 85, 2402063AA0E).

2. Component: Planetary & Spider Group (Comp 89, 90, 91, 92)
This Wheel Planetary Logic consists of the ‘Cross’ (Comp 92, 2403061-A0E) which holds four ‘Planetary gears’ (Comp 91, 2403056-A0E). These gears mesh with the two ‘Half shaft gears’ (Comp 89, 2403051-A0E), allowing the ‘Left half shaft’ (Comp 101) and ‘Right half shaft’ (Comp 102) to rotate at different speeds.

3. Component: Carrier Bearing & Adjustment Group (Comp 83, 84)
The entire differential assembly (Comp A) is supported in the reducer housing (Comp 6) by two massive ‘Tapered roller bearings’ (Comp 84, 32216/YA6E). The Backlash Logic is set here. Technicians use the ‘Adjustment shim-differential bearing’ (Comp 83, 2403071-A0E) to move the carrier left or right, setting the precise tooth contact pattern (backlash) between the pinion and ring gear. This is a final, critical adjustment for the FAW J6P Zhongqiao.

FAW J6P Zhongqiao: Complete 105-Part Breakdown

The following table provides the complete, detailed breakdown of all 105 component types in the FAW J6P Zhongqiao assembly (2500010AA6E) for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This list is essential for ordering spare parts and performing a complete overhaul of the FAW J6P Zhongqiao.

Core Specifications

The specifications for the FAW J6P Zhongqiao are defined by its critical role as a heavy-duty, through-axle with an integrated power divider and dual-lock system. These specifications are key to understanding the component’s capabilities and ensuring correct service. The FAW J6P Zhongqiao is a complex and robust assembly.