

Bienvenue dans ce guide technique critique sur le Mécanisme de commande d'embrayage FAW, the complete hydraulic and pneumatic actuation system for the FAW Jiefang CA4251P66K24T1A3E5 6×4 tracteur semi-remorque diesel. This system is the vital link between the driver’s foot and the engine’s clutch.
Le Mécanisme de commande d'embrayage FAW est un “logique” system designed for one purpose: to multiply the force from the driver’s pedal, making it possible to disengage the massive, high-torque clutch. It uses a ‘Clutch Booster Assembly’ (1602305A70A) that is powered by the truck’s air brake system to provide this power assist.
Ce guide est une ressource essentielle pour les techniciens professionnels et les gestionnaires de flotte. Nous déconstruirons l'ensemble Mécanisme de commande d'embrayage FAW dans son 12 composants réparables, including the booster, la fourchette de dégagement, the hydraulic piping, and all critical fasteners and seals.
Le coeur du Mécanisme de commande d'embrayage FAW is the ‘Clutch Booster Assembly’ (1602305A70A). C'est le “direction assistée” for the clutch. Disengaging a heavy-duty truck clutch requires thousands of pounds of force, which is impossible for a driver to generate with their leg alone. This booster assembly is an air-over-hydraulic unit that multiplies the driver’s effort.
**How it works:** Le Mécanisme de commande d'embrayage FAW‘s logic is simple. Lorsque le conducteur appuie sur la pédale d'embrayage, it sends a small amount of hydraulic fluid (brake fluid) from the clutch master cylinder into this booster. This small hydraulic pressure opens an internal air valve.
This valve then releases a large volume of high-pressure air (100+ psi) from the truck’s main air brake tanks. This high-pressure air pushes on a large piston inside the booster, which in turn pushes a hydraulic piston, sending a massive, amplified hydraulic force out of the booster and to the clutch fork. Ce “logique” of using a small hydraulic signal to control a large pneumatic force is what makes the Mécanisme de commande d'embrayage FAW so effective, reducing pedal effort by 70% ou plus.
Un échec Mécanisme de commande d'embrayage FAW booster is a common fault. It can fail internally, causing the clutch pedal to become rock-hard and impossible to press. It can also fail by leaking air from its seals, or by allowing hydraulic fluid to leak into the air system (ou vice-versa). Le Mécanisme de commande d'embrayage FAW is typically replaced as a complete assembly.
The ‘Release fork & bracket assembly’ (1602420A70A) est le “muscle” de la Mécanisme de commande d'embrayage FAW. C'est un véhicule robuste, forged steel lever that pivots on a bracket inside the transmission’s bell housing.
Its function is to transfer the amplified force from the ‘Clutch Booster Assembly’ to the clutch’s ‘Release Bearing’ (le “throw-out bearing”). The booster’s push rod presses on the outside of this fork. The fork then pivots, et le “forked” end on the inside of the bell housing slides the release bearing forward along the transmission shaft.
This forward motion is what presses the bearing against the spinning pressure plate, disengaging the clutch. This fork and its pivot bracket are under immense, repeated stress. Wear on the pivot points or “coussinets” where the fork touches the bearing is a common issue that can lead to a “spongieux” ou “doux” pédale, or a clutch that will not fully disengage, making it hard to shift. This is a critical mechanical link in the Mécanisme de commande d'embrayage FAW.
The hydraulic “tuyauterie” de la Mécanisme de commande d'embrayage FAW is responsible for transmitting the fluid. This system uses brake fluid, which is non-compressible.
The ‘Pipe assembly-clutch’ (1602200-90R.) is the main hydraulic line. It is a pre-bent, rigid steel pipe with flexible, high-pressure rubber sections at each end. This flexible design is critical, as it must absorb the constant vibration and movement of the engine/transmission relative to the stationary truck cab (where the master cylinder is).
The ‘Straight pipe joint assembly’ (1602325-1500) and ‘Pipe joint’ (1602241A70A) are the high-pressure adapter fittings that connect this main pipe assembly to the ‘Clutch Booster Assembly’ (1602305A70A). A leak in any of these lines or fittings will introduce air into the hydraulic side of the Mécanisme de commande d'embrayage FAW.
Air in a hydraulic line is a critical failure. Because air is compressible, pressing the clutch pedal will only “squish” the air bubble instead of moving the fluid. This results in a “mort” pedal that goes straight to the floor with zero resistance, leaving the driver unable to disengage the clutch. Bleeding this air from the Mécanisme de commande d'embrayage FAW is a key maintenance procedure.
L'ensemble Mécanisme de commande d'embrayage FAW is a high-pressure system that relies on its seals and fasteners. The ‘Seal washer’ (1602242A70A) est une critique, single-use component. C'est un “rondelle d'écrasement,” likely made of soft copper or aluminum, used to seal one of the high-pressure banjo-bolt fittings (like 1602241A70A). It must be replaced to prevent leaks.
The mounting hardware is also specialized. The ‘Hex head flange bolt’ (Q1851890T et Q1851450T) and ‘Hex head bolt’ (CQ1500825) are high-tensile fasteners used to secure the ‘Release fork & bracket assembly’ and the ‘Clutch Booster Assembly’ to the transmission bell housing. Le “bride” heads distribute the load to prevent cracking the aluminum housing.
Le 12 « Écrou hexagonal’ (CQ34010) et 12 'Joint à ressort’ (Q40310) units are likely used for the ‘Pipe assembly-clutch’ (1602200-90R.) and its support brackets. The spring gaskets (rondelles de blocage) are vital for preventing the nuts from vibrating loose, which would lead to a fluid leak or a fractured pipe. This robust hardware is essential for the long-term reliability of the Mécanisme de commande d'embrayage FAW.
Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 12 components identified in the ‘Clutch Control Mechanism’ schéma du tracteur FAW CA4251P66K24T1A3E5. A fully-functional Mécanisme de commande d'embrayage FAW is essential for safe operation.
| Marque | Partie no. | Nom de la pièce | Quantité |
|---|---|---|---|
| 1 | Q1851890T | Boulon à bride à tête hexagonale | 1 |
| 2 | Q1851450T | Boulon à bride à tête hexagonale | 1 |
| 3 | 1602420A70A | Fourche de déverrouillage & bracket assembly | 1 |
| 4 | Q40308 | Joint à ressort | 4 |
| 5 | CQ1500825 | Boulon à tête hexagonale | 4 |
| 6 | 1602305A70A | Clutch Booster Assembly | 1 |
| 7 | 1602242A70A | Seal washer | 1 |
| 8 | 1602241A70A | Pipe joint | 1 |
| 9 | 1602325-1500 | Ensemble de joint de tuyau droit | 1 |
| 10 | 1602200-90R. | Pipe assembly-clutch | 1 |
| 11 | CQ34010 | Écrou hexagonal | 12 |
| 12 | Q40310 | Joint à ressort | 12 |
Les spécifications pour le Mécanisme de commande d'embrayage FAW are defined by its function as a hybrid air-over-hydraulic assist system. L'ensemble Mécanisme de commande d'embrayage FAW is designed to multiply pedal force.
| Demande de véhicule | FAW Jiefang CA4251P66K24T1A3E5 6×4 Tracteur |
| Groupe de composants | Mécanisme de commande d'embrayage FAW |
| Type de système | Pneumatic Assist (Air-over-Hydraulic) |
| Main Actuator | 1x Clutch Booster Assembly (1602305A70A) |
| Liaison mécanique | 1x Release fork & bracket assembly (1602420A70A) |
| Conduite hydraulique | 1x Pipe assembly-clutch (1602200-90R.) |
| Hydraulic Fluid | Liquide de frein (Par exemple, POINT 4) |
| Pneumatic Source | Vehicle’s Main Air Brake System |
| Critical Seal | 1x Seal washer (1602242A70A) |
| Fonction principale | To use pneumatic pressure to multiply the driver’s hydraulic pedal force, enabling disengagement of the heavy-duty clutch. |
Pièces FAW, y compris l'ensemble bloc-cylindres, sont emballés avec soin pour garantir une livraison en toute sécurité. Chaque composant est sécurisé dans des matériaux de protection pour éviter tout dommage pendant le transport. Le réseau logistique garantit des expéditions ponctuelles dans le monde entier, soutenir des opérations de maintenance efficaces. Vous trouverez ci-dessous une image illustrant l'emballage standard des pièces de camion FAW., mettant en valeur l’attention portée aux détails dans la manipulation et le stockage.
Cette approche d'emballage minimise le risque de corrosion ou de dommages causés par les chocs., s'assurer que les pièces comme l'ensemble bloc-cylindres FAW arrivent en parfait état. Les clients peuvent compter sur la logistique de FAW pour une qualité et une fiabilité constantes.