Unité de commande d'inclinaison de cabine FAW: Le 2 en 1 “Double logique” Système pour un accès total à la cabine

Welcome to this in-depth technical breakdown of the Unité de commande d'inclinaison de cabine FAW. This is the complete hydraulic and electric assembly responsible for lifting the entire cab-over-engine on the FAW Jiefang CA4251P66K24T1A3E5 6×4 tracteur semi-remorque diesel. This is one of the most critical safety and maintenance systems on the vehicle, as its “logique” is to provide technicians with safe, reliable access to the engine and transmission.

Le “Assemblage logique” designation for the Unité de commande d'inclinaison de cabine FAW est la clé. This is not one system, but a “double logique” ou “hybride” système. It combines a primary ‘Electric pump assy’ (5002075B91W-C00) for effortless, push-button operation, with a secondary, “backup” ‘Manual pump assy’ (5002070B91W-C00). This built-in redundancy is a critical safety “logique,” ensuring that a technician can *always* lift the cab, even if the truck’s battery is dead.

This expert guide is an essential resource for technicians and fleet operators. Nous déconstruirons l'ensemble Unité de commande d'inclinaison de cabine FAW dans son 23 types de composants. Nous analyserons le “Electric Logic” (the motor, pompe, and relay), le “Manual Logic” (the hand pump and switch), the shared “Hydraulic Network” (the hoses), et le “Fastening Logic” (the critical anti-vibration hardware).

Cœur 1: Le “Electric Logic” Système (MSU 19-22)

This is the primary, convenience-focused part of the Unité de commande d'inclinaison de cabine FAW. This system allows the driver or technician to lift the cab by simply pressing the ‘Hydraulic cab tilt switch assy’ (3735080-A01) inside the cab.

1. ‘Electric pump assy’ (5002075B91W-C00): C'est le “brain and muscle” of the electric system. This MSU is an integrated unit that combines the hydraulic pump and the electric motor into one assembly.

2. ‘Electric pump motor’ (5002180AA01-C00): This is the high-torque, 24V DC motor that drives the pump. C'est “logique” is to provide high power for a short, intermittent duration. It draws a massive amount of current, which is why it cannot be wired directly to the dashboard switch.

3. ‘Electric pump relay assy’ (5002190B91W-C00): C'est le “logique” that makes the system safe. The in-cab switch (3735080-A01) sends a small, low-amperage signal to this relay. This relay (a heavy-duty solenoid) then closes, handling the massive, high-amperage current needed by the motor. This protects the cab’s wiring from melting. This relay is a critical MSU.

4. ‘Electric pump shield assy’ (5002185B91W-C00): This is the system’s “armor.” This MSU protects the entire electric pump assembly from road debris, water spray, and ice. A missing shield is a common cause of premature motor corrosion and failure.

Cœur 2: Le “Manual Logic” Backup System (MSU 1-4)

C'est le “redundancy logic” built into the Unité de commande d'inclinaison de cabine FAW. This system ensures that even with a dead battery, a failed motor, or a blown relay, the cab can still be lifted for service.

1. ‘Manual pump – cab lift’ (5002070B91W-C00): This is the core of the manual system. It is a hydraulic hand pump, similar to a bottle jack. The technician inserts the truck’s jack handle (from the tool kit) into this pump’s socket and manually pumps it to raise the cab.

2. ‘Manual switch bracket assy’ (5002120B91W): This bracket holds the manual pump. More importantly, it holds the “changeover switch” ou “selector valve.” Le “logique” is that a technician must *first* turn this valve (often with the same jack handle) to change the hydraulic circuit from “electric mode” à “manual mode.” This prevents the manual pump from trying to push fluid “backwards” through the electric pump.

3. ‘Gasket’ (5002133B91W): This MSU provides the critical seal between the manual pump and its mounting bracket, preventing hydraulic fluid leaks under high pressure.

Cœur 3: Le “Double logique” Hydraulic Network (MSU 8-13)

Ce groupe de MSU est le “plumbing” de la Unité de commande d'inclinaison de cabine FAW. These high-pressure hydraulic hoses are the arteries that connect *both* pumps to the main tilt cylinder.

1. The 3-Way Logic: ‘Hose assy – connect pump to 3-way joint’ (5002085B91W-C00)

C'est le “logique” that allows the dual-pump system to work. Le “3-way joint” (or a T-junction) is the point where the fluid line from the electric pump and the fluid line from the manual pump *meet*. From this junction, a single line then proceeds to the main tilt cylinder. This hose is the MSU that makes this “combined” logic possible.

2. Le “Push/Pull” Logique: (MSU 11 & 12)

The system uses a dual-action cylinder, which requires two hoses:

• ‘Hose assy – hydraulic cylinder push oil port’ (5002080B91W-C00): C'est le “lift” line. The pumps push high-pressure fluid through this hose to *extend* the cylinder and lift the cab.
• ‘Hose assy – hydraulic cylinder pull oil port’ (5002100B91W-C00): C'est le “lower” line. To lower the cab, the changeover valve is opened, allowing the cab’s weight to push fluid *out* of the cylinder and back to the reservoir through this hose.

3. Protection & Routing (MSU 13, 16, 17):

Ce sont les points critiques, often-overlooked MSUs. A ‘Deflector plate’ (5002141B91W) and ‘Shield-hydraulic oil pipe’ (5002146B91W) protect these vital hoses from road debris, stone chips, and high heat from the exhaust. A ‘Rubber seal’ (3724032-50UN) protects a hose as it passes through a chassis member. A failure of these protective MSUs leads to a chafed, burst hose, qui est le #1 failure point for any hydraulic system.

Cœur 4: Le “Anti-vibrations” Logique de fixation (MSU 5, 6, 14, 15, 18)

L'ensemble Unité de commande d'inclinaison de cabine FAW is subject to massive vibration. The fastener system is not just hardware; it is an engineered “anti-vibration” logic to prevent the pumps from shaking themselves loose.

‘Combination bolt’ (CQ1461035, CQ1460825, CQ1460820): The parts list calls for a total of eight (8) de ceux-ci. Le “Combinaison” logic is the most important feature. These bolts have a *captive, rondelle frein pré-fixée* (either a spring washer or serrated head). This lock washer provides constant tension, making it physically impossible for the bolt to back out from vibration.

‘Hexagon nut’ (CQ34008): These four nuts are used on the other side of the bolts (Par exemple, CQ1460820). Ils sont à haute résistance, couple dominant “Nyloc” des noisettes. Their nylon insert binds to the threads, providing a *second layer* of anti-vibration logic. This dual-system (rondelle de blocage + contre-écrou) is what ensures the Unité de commande d'inclinaison de cabine FAW remains securely fastened for the life of the vehicle.

FAW Cab Tilt Control Unit Parts List

Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 23 types de composants identifiés dans le Unité de commande d'inclinaison de cabine FAW schéma du tracteur FAW CA4251P66K24T1A3E5.

Spécifications techniques et contexte d'assemblage

Les spécifications pour le Unité de commande d'inclinaison de cabine FAW are defined by its critical, dual-logic function. It combines a primary electric system for convenience and a manual backup system for safety and service redundancy.