Support de roue de secours FAW: Le 3 Groupes de composants critiques à l’intérieur

Bienvenue dans ce guide technique critique sur le Support de roue de secours FAW assemblée (Assemblée 532). C'est le complet, heavy-duty carrier system for the spare wheel on the FAW Jiefang CA4251P66K24T1A3E5 6×4 tracteur semi-remorque diesel. This assembly is a critical component for both safety and legal road-readiness.

Le Support de roue de secours FAW is a multi-part, chassis-mounted assembly. C'est “logique” is to securely store a heavy (100kg+) truck wheel and tyre, ensuring it is safe from theft, protected from road debris, and does not vibrate loose. A loose spare wheel is a catastrophic road hazard.

This in-depth guide is an essential resource for professional chassis technicians, body builders, et spécialistes des pièces détachées. Nous déconstruirons l'ensemble Support de roue de secours FAW système dans son 3 main serviceable component groups, including the ‘Bottom plate assy’ (3105015-91R.), the ‘Upright hook assy’ (3105020-91R.), and the critical ‘SPL lock nut’ (T32718).

Composant principal 1: The ‘Bottom Plate Assembly’ (3105015-91R.)

La fondation du Support de roue de secours FAW is the ‘Spare tyre bracket bottom plate assy’ (3105015-91R.). This is the main structural component that bears the entire weight of the spare wheel and tyre. This assembly is a heavy-duty fabrication of welded, acier à haute résistance.

This component bolts directly to the truck’s main C-channel frame rails. C'est le “shelf” that the wheel rests on. Cet assemblage (Marque 2) also includes the ‘Base plate-spare tyre bracket’ (3105011-91R.), which is the main plate, and the two ‘Locating pin-spare tyre bracket’ (3105013-91R.) unités.

Le “logique” of these ‘Locating pins’ est critique. They are hardened steel dowels that stick up from the base plate. The bolt holes of the spare wheel are slid *over* these pins. This is a key safety and ease-of-use feature of the Support de roue de secours FAW. It allows the technician to “hang” the heavy wheel on these pins, supporting its weight *before* they have to install the fasteners. This prevents the wheel from sliding off and makes installation a one-person job. More importantly, these pins absorb all the “tondre” forcer (the force of the wheel trying to slide off) during braking and cornering, taking the load off the fasteners. This is a critical part of the Support de roue de secours FAWla conception.

Composant principal 2: The ‘Upright Hook Assembly’ (3105020-91R.)

The second key “logique” de la Support de roue de secours FAW is the ‘Spare tyre bracket upright hook assy’ (3105020-91R.). C'est le “clamping” mechanism that holds the wheel down. Cet assemblage (Marque 3) is a multi-part welded fabrication that includes:

• **’Fixed spare tyre bracket upright post’ (3105012-91R.):** The main vertical steel post.
• **’Spare tyre bracket locating plate’ (3105014-91R.):** A plate that presses against the tire.
• **’Spare tyre bracket locating hook’ (3105016-91R.):** Le “hook” ou “T-bolt” that provides the clamping force.

Ce composant “logique” is simple but effective. The ‘Upright post’ is bolted to the truck’s frame. The spare wheel is hung on the ‘Locating pins’ of the base plate. Then, this ‘Upright hook assy’ is swung into place. The ‘Locating hook’ is a long, threaded rod (like a J-hook or T-hook) that passes through a bolt-hole on the wheel.

The ‘Locating plate’ acts as a large, flat washer, spreading the clamping force over a wide area of the wheel to prevent damage. This entire hook assembly is what provides the “clamping” force for the Support de roue de secours FAW, pressing the wheel firmly against the vertical post and down onto the base plate, creating a rigid, vibration-proof mount. Le Support de roue de secours FAW relies on this hook for its security.

Composant principal 3: The ‘SPL Lock Nut’ (T32718)

La finale “logique” de la Support de roue de secours FAW is its single, critical fastener: the ‘SPL hex small flange lock nut’ (T32718). This is the *only* part listed under Mark 1, highlighting its importance.

This is not a standard nut. It is an “SPL” (Stover Prevailing-torque Locknut) noix. C'est “logique” is that the top threads are intentionally deformed (crimped) into a slight oval. When this nut is threaded onto the ‘Locating hook’ (3105016-91R.), this deformed section creates an immense, “elastic” friction grip on the threads.

This is the safety-critical “logique” de la Support de roue de secours FAW. A standard nut would, under the constant, high-frequency vibration of a truck’s chassis, slowly “marcher” ou “back off” the threads. This would eventually cause the ‘Upright hook assy’ to become loose, allowing the 100kg spare wheel to detach from the Support de roue de secours FAW and fall onto the highway, a catastrophic and potentially fatal event.

Ce “SPL” lock nut is designed to be **immune** to vibration. It *cannot* back off on its own. This single, inexpensive part is the ultimate safety guarantee for the entire Support de roue de secours FAW assemblée. It is often a “single-use” ou “limited-use” item; once it has been removed and re-installed multiple times, its locking properties diminish, and it must be replaced to ensure the continued safety of the Support de roue de secours FAW.

FAW Spare Wheel Bracket Parts List

Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 3 component groups (totaling 8 pièces) identified in the ‘Spare Wheel Bracket’ (532) schéma du tracteur FAW CA4251P66K24T1A3E5.

Spécifications techniques et contexte d'assemblage

Les spécifications pour le Support de roue de secours FAW sont définis par sa fonction de poids lourd, vibration-proof carrier. Le Support de roue de secours FAW is a critical safety and compliance assembly.