FAW Front Spring Suspension Ring Assembly: Deconstructing the 18 Critical Components

Welcome to this critical technical guide on the FAW Front Spring Suspension Ring Assembly. This is the complete “shackle” and “pin” assembly for the rear mounting point of the front leaf springs on the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This assembly is the critical pivot point for the entire front suspension system.

The FAW Front Spring Suspension Ring Assembly, also known as the shackle, has a vital “logic.” It must allow the heavy-duty leaf spring to change its length as it flexes. When the spring compresses over a bump, it flattens and becomes *longer*. This shackle assembly acts as a swinging pivot, allowing for this elongation without binding the spring.

This in-depth guide is an essential resource for professional suspension technicians and parts specialists. We will deconstruct the entire FAW Front Spring Suspension Ring Assembly into its 18 serviceable components, including the main ‘Hangers’ (shackles), the high-strength ‘Pins’, the ‘Grease fittings’, and the critical mounting hardware.

Core Component: The ‘Hanger’ (Shackle) (2902466A50A)

The heart of the FAW Front Spring Suspension Ring Assembly is the ‘Hanger-Front Leaf Spring’ (2902466A50A). The parts list calls for two of these, one for each side of the vehicle. This component is the “shackle” itself. It is a heavy-duty, forged or cast steel “swinging link” that connects the rear “eye” of the leaf spring to the truck’s main frame rail (via a fixed hanger bracket, not pictured).

The “logic” of this FAW Front Spring Suspension Ring Assembly is to manage spring elongation. A leaf spring is not a coil; it is an arc of steel. When the truck hits a bump, the spring compresses, causing this arc to flatten. As it flattens, its overall length from “eye-to-eye” increases. The front eye of the spring is in a fixed mount. This rear shackle must be able to pivot, or “swing” backward, to accommodate this increase in length.

Without this swinging “Hanger,” the FAW Front Spring Suspension Ring Assembly would be rigid. The first large bump would cause the leaf spring to bind and snap, or it would tear the spring hanger from the truck’s frame. These two ‘Hanger’ components are therefore essential for the suspension to articulate, handling the full weight of the front-end and absorbing the constant, violent forces from the road.

The Pivot: Shackle Pins (2902481-50A)

The ‘Hanger’ (shackle) is a link, but it must pivot on something. This is the job of the ‘Pin-Front leaf spring rear bracket’ (2902481-50A). The parts list calls for four of these pins, which is a complete set for both sides of the truck (two pins per shackle).

One pin is used to connect the “top” of the shackle to the fixed frame bracket, and the other pin connects the “bottom” of the shackle to the “eye” of the leaf spring. These pins are the “axles” or “hinges” of the FAW Front Spring Suspension Ring Assembly.

These are not simple bolts. They are precision-ground, high-strength, case-hardened steel pins. They must be strong enough to withstand the “shear” force of the entire front-end load, and hard enough to resist wear from the constant pivoting motion. A worn or “ovaled” pin in the FAW Front Spring Suspension Ring Assembly will create a “clunking” noise on bumps and lead to “sloppy” steering and alignment issues.

The “Logic”: The Lubrication System (C070145)

The true “logic” of this specific FAW Front Spring Suspension Ring Assembly is revealed by its serviceable design. The list calls for four ‘Bent neck grease fitting’ (C070145) components. This is a 1:1 ratio with the four ‘Pins’ (2902481-50A).

This means the FAW Front Spring Suspension Ring Assembly is not a “sealed-for-life” unit. It is a **serviceable** assembly. The ‘Pins’ are drilled with grease channels, and these “grease fittings” (or “zerks”) are threaded into them. This allows a technician to use a grease gun to force heavy-duty chassis grease into the assembly as part of a regular maintenance schedule.

This lubrication logic is critical for two reasons:

1. **1. Lubrication:** The grease creates a high-pressure film between the steel ‘Pin’ and the (unlisted, but implied) bronze or rubber bushings inside the shackle and spring eye. This allows the shackle to pivot smoothly and silently, preventing the “squeaking” and “groaning” common with dry leaf springs.
2. **2. Protection:** This is the most important function. The act of “purging” the joint with new grease forcefully pushes *out* the old, contaminated grease. This process expels the dirt, road salt, and water that try to work their way into the joint. Without this, the water would cause the pin to rust and “seize” inside its bushing.

A seized shackle pin is a critical failure of the FAW Front Spring Suspension Ring Assembly. It prevents the shackle from pivoting, which means the leaf spring can no longer elongate. This results in an incredibly harsh, unyielding ride and will, in a very short time, cause the leaf spring to snap or the main frame hanger to be torn off the chassis. Regular greasing of these 4 fittings is the most important maintenance task for the FAW Front Spring Suspension Ring Assembly.

The Foundation: Fastener System (CQ1511280 & CQ34112)

The final components of the FAW Front Spring Suspension Ring Assembly are the ‘Hex head bolt’ (CQ1511280) and ‘Hex nut’ (CQ34112) units. The list calls for four of each.

These are *not* the shackle pins. These are the heavy-duty fasteners (likely M12, 10.9-grade) that are used to mount the **fixed frame hanger** (the bracket that the *top* shackle pin pivots in) to the truck’s main C-channel frame rail.

These four bolts (two per side) are the structural foundation of the entire FAW Front Spring Suspension Ring Assembly. They must be torqued to a precise specification to ensure the hanger bracket is rigidly attached to the frame. A loose hanger bracket, caused by failed or improperly torqued bolts, will create a “popping” noise, cause severe steering and alignment problems, and will quickly “oval” the bolt holes in the chassis, leading to a very expensive repair.

FAW Front Spring Suspension Ring Assembly Parts List

The following table provides the complete, detailed breakdown of all 5 component types (totaling 18 pieces) identified in the ‘Front Spring Suspension Ring Assembly’ diagram for the FAW CA4251P66K24T1A3E5 tractor.

Technical Specifications and Assembly Context

The specifications for the FAW Front Spring Suspension Ring Assembly are defined by its function as a serviceable, high-load pivot for the leaf spring suspension. The FAW Front Spring Suspension Ring Assembly is a key component for ride quality and safety.