Dispositif de support hydraulique FAW pour la cabine: 5 Composants de pivot critiques pour la sécurité contre l'inclinaison

Welcome to this critical technical deep dive into the Dispositif de support hydraulique FAW pour la cabine (Lower Mount Assembly). This component group is the structural pivot and anchor point for the hydraulic cab tilt cylinder on the FAW Jiefang CA4251P66K24T1A3E5 6×4 tracteur semi-remorque diesel. C'est “logique” is to create a secure, high-strength pivot, allowing the hydraulic cylinder to articulate safely as it lifts the entire weight of the cab.

Le Dispositif de support hydraulique FAW pour la cabine is not the cylinder itself, but the assembly of hardware that connects the “œil” (lower loop) of the cylinder to the main chassis frame. Ce “pivot logic” is a high-stress, high-shear application. It must be strong enough to withstand the immense forces of lifting the cab, and durable enough to resist the constant, high-frequency vibrations from the engine and road.

This in-depth guide is an essential resource for chassis technicians and service managers. Nous déconstruirons l'ensemble Dispositif de support hydraulique FAW pour la cabine dans son 5 types de composants principaux. We will analyze the main ‘Pivot Pin’ (the core MSU), the vibration-damping ‘Soft Pads’, et la critique, à plusieurs étages “anti-vibration” fastener system that holds it all together.

MSU 1: Le “Pivot” – The Logic of the Lower Pivot Pin (5002023AB85)

Ce composant, the ‘Pin-hydraulic cylinder lower fixed point’ (5002023AB85), est le “plus long” and most critical MSU in the entire Dispositif de support hydraulique FAW pour la cabine. This single pin is the “essieu” on which the entire hydraulic cylinder pivots.

Shear-Load Logic: Le “logique” of this pin is to handle extreme shear force. When the hydraulic cylinder is actuated to lift the multi-ton cab, the entire weight and force is concentrated on this one pin. It is designed to resist being “sliced” in half. Pour y parvenir, this MSU is not a simple bolt; it is a precision-ground, high-tensile, hardened steel dowel.

Construction: This pin is likely made from a high-carbon alloy steel (comme 4140) that has been case-hardened. This process creates an ultra-hard, wear-resistant outer “peau” while maintaining a slightly softer, more ductile core. Le “logique” of this metallurgy is to provide a surface that resists wear from the pivoting bushings, while the core remains tough and resistant to the shock loads that could snap a brittle, fully-hardened pin. The surface is also polished to a low-friction finish to allow for smooth rotation.

Facilité d'entretien (MSU): This pin is a primary MSU and a key wear item. Over tens of thousands of tilt cycles, or from high vibration, the pin can begin to wear, créer un “cliquetis” ou “pente” in the lower cab mount. During service of the Entry_ID_475 (Cab Tilting Cylinder), this pin must be inspected. If any scoring, piqûre, ou “ovaling” (uneven wear) is present, the pin must be replaced. Failure to replace a worn pin will lead to the rapid destruction of the ‘Soft Pads’ (MSU 3) and eventual failure of the entire Dispositif de support hydraulique FAW pour la cabine.

MSU 3 & 4: The Vibration Damping “Logique” (Coussinets & Machine à laver)

This group of components provides the “cushioning” and spacing logic for the Dispositif de support hydraulique FAW pour la cabine.

1. ‘Soft pad-hydraulic cylinder lower fixed point’ (5002027-A01): La liste des pièces en appelle à deux (2) of these critical MSUs. These are the bushings for the pivot. Leur “logique” is to prevent metal-on-metal contact.

These pads are placed on either side of the cylinder’s “œil,” sandwiched between the cylinder and the chassis-mounted bracket. They are made from a high-durometer polymer or nylon. This design provides three functions:

• Amortissement des vibrations: They absorb high-frequency vibrations from the engine/chassis, protecting the hydraulic cylinder’s seals from damage.
• Noise Prevention: They prevent the “grinçant” et “gémissant” that would come from a steel-on-steel pivot.
• Sacrificial Wear: They are designed to be the “sacrificiel” composant. They are much cheaper to replace than the pin or the cylinder.

2. « Grande laveuse’ (Q40218): This single MSU works with the fastener system. C'est “logique” is load distribution. It is placed on the outside of the chassis bracket, providing a large, flat surface for the nut to tighten against. This prevents the nut from “digging into” ou “ovaling” the hole in the bracket, Assurer le Dispositif de support hydraulique FAW pour la cabine remains securely clamped.

MSU 2 & 5: Le “Anti-vibrations” Logique de fixation

This final group of MSUs is the hardware that secures the main ‘Pivot Pin’. Le “logique” here is all about anti-vibration, a critical safety feature for the Dispositif de support hydraulique FAW pour la cabine. The system uses two different nuts.

1. «Écrou à bride hexagonale’ (Q039620): This is likely the “primary” noix. The pin (MSU 1) is threaded on its end, passes through the bracket, the bushings, and the cylinder eye, and exits the other side. This nut, along with the ‘Large washer’ (MSU 4), is tightened to set the correct “précharger” on the soft pads. Le “bride” logic means it has an integrated washer, offrant un large, secure clamping face.

2. ‘Type 1 contre-écrou hexagonal à insert non métallique’ (Q32918T): This is the most critical safety component in the Dispositif de support hydraulique FAW pour la cabine. C'est un “Nyloc” noix. C'est “logique” is to be a *jam nut* or *locking nut*.

It is threaded onto the pin *after* the primary nut (Q039620). The internal nylon ring binds tightly to the threads, creating a powerful “couple dominant” that *prevents* the primary nut from backing off due to vibration. A standard nut *will* vibrate loose. This dual-nut, self-locking system is what guarantees the pivot pin cannot fall out, which would cause the cab to become detached from the tilt cylinder.

Facilité d'entretien (MSU): Both nuts are MSUs. The ‘Lock nut’ (Q32918T) is **strictly a single-use part**. Once it is removed, the nylon insert is permanently deformed and loses its locking ability. It *must* be replaced with a new nut every single time the Dispositif de support hydraulique FAW pour la cabine est desservi.

FAW Hydraulic Support Device For The Cab Parts List

Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 5 types de composants identifiés dans le Dispositif de support hydraulique FAW pour la cabine (Lower Mount) schéma du tracteur FAW CA4251P66K24T1A3E5.

Spécifications techniques et contexte d'assemblage

Les spécifications pour le Dispositif de support hydraulique FAW pour la cabine are defined by its function as a high-shear, anti-vibration pivot point. All components are critical safety MSUs.