

Bem-vindo a este guia técnico especializado sobre o Bomba de direção hidráulica FAW (Parte não. 3407020-93W-C00), the hydraulic heart of the steering system for the FAW Jiefang CA4251P66K24T1A3E5 6×4 trator semirreboque diesel. This component is essential for driver control and safety.
A função do Bomba de direção hidráulica FAW is to provide hydraulic assistance, reducing the immense physical effort required to turn the front wheels of a fully-loaded tractor. It does this by generating high-pressure hydraulic fluid (muitas vezes excedendo 1,500 PSI) that is fed to the steering gear.
Este guia detalhado é um recurso fundamental para técnicos profissionais e gestores de frota. Vamos desconstruir todo Bomba de direção hidráulica FAW mounting assembly into its 3 menores unidades utilizáveis: the main pump, its critical mounting gasket, and the high-tensile fasteners that secure it to the engine.
The main component is the ‘Power Steering Pump Assembly’ (3407020-93W-C00). This is the heart of the hydraulic assist system. For a heavy-duty diesel engine, o Bomba de direção hidráulica FAW is not a belt-driven accessory as in a passenger car. Em vez de, it is a robust, gear-driven pump that mounts directly to the engine’s timing gear case. This direct gear-drive is essential for reliability, as it eliminates the risk of a slipping or breaking belt, which would instantly make the truck incredibly difficult to steer.
Esse Bomba de direção hidráulica FAW is a positive-displacement pump, most likely a high-volume **gerotor** or **vane-type** pump. In a vane pump design, a slotted rotor spins inside an eccentric (off-center) habitação. Vanes slide in and out of the rotor slots, creating expanding chambers on the inlet side (which draw in low-pressure fluid from the reservoir) and shrinking chambers on the outlet side. Esse “shrinking” action is what compresses the fluid and generates the high pressure needed for the steering gear.
A critical feature of the Bomba de direção hidráulica FAW is its internal **flow control valve**. This valve is essential because a gear-driven pump’s output volume increases with engine RPM. Se não controlado, the steering would be overly sensitive at high speeds and normal at idle. The flow control valve, which is a spring-loaded spool valve, bleeds off excess fluid at higher RPMs, ensuring that the *volume* of fluid sent to the steering gear is constant. Isto fornece uma consistência, predictable steering “sentir” whether the truck is idling or at highway speed.
Also housed within the Bomba de direção hidráulica FAW assembly is a **pressure relief valve**. This is a safety poppet valve. When the driver turns the steering wheel all the way to a “trancar” (Por exemplo, in a parking lot), the steering gear is blocked and can no longer accept fluid. The pressure in the hose would spike almost instantaneously, high enough to rupture the hose or damage the pump. The relief valve senses this pressure spike (Por exemplo, >1500 PSI) and opens, dumping the high-pressure fluid directly back to the inlet side, protecting the entire system. O “lamentar” you hear when holding the wheel at a full lock is the sound of this valve in operation. Uma falha do Bomba de direção hidráulica FAW often means one of these internal valves has failed, or the gerotor/vane assembly itself is worn out, causing low pressure and stiff steering.
The ‘Gasket-Power Steering Pump’ (3407024-26D) is the single most critical serviceable part in this assembly. Porque o Bomba de direção hidráulica FAW is gear-driven, it mounts directly to the engine’s timing gear case with a flange, just like the fuel injection pump or air compressor. This one gasket must seal this complex interface.
This gasket has two primary, high-stakes functions. Primeiro, it must seal the “limpar” hydraulic steering fluid from the “sujo” óleo de motor. The main drive gear of the Bomba de direção hidráulica FAW is lubricated by the engine’s timing gear case, which is filled with engine oil. The pump’s main shaft must pass through this interface. Esta junta (along with a shaft seal) prevents the two fluids from ever mixing. A failure here would contaminate the entire power steering system with abrasive engine oil and soot, destroying the steering gear.
Segundo, this gasket must also seal the pump’s internal hydraulic passages. O Bomba de direção hidráulica FAW‘s flange has a low-pressure “entrada” porta (drawing fluid from the reservoir) and a high-pressure “tomada” porta (feeding the steering gear). This gasket creates a high-pressure seal for the outlet port, prevenindo 1,500+ PSI hydraulic fluid from leaking externally.
A failure of this gasket on the inlet side would cause the Bomba de direção hidráulica FAW to suck in air, leading to cavitation (a loud whining or grinding noise) and foamy, unresponsive steering. A failure on the outlet side would result in a massive, high-pressure hydraulic fluid leak. This gasket is a non-reusable, “replace-on-sight” componente.
The final components listed are the two ‘Hex flange bolt, haste grossa (Tipo padrão)’ (Q1841030) fixadores. These are the two high-tensile bolts that secure the entire Bomba de direção hidráulica FAW assembly to the engine’s gear case.
These bolts must perform a critical task: they must provide the precise and even clamping force required to compress the ‘Gasket-Power Steering Pump’ (3407024-26D) and create a perfect seal. Além disso, they must resist the immense rotational “shearing” force that the drive gear exerts on the Bomba de direção hidráulica FAW.
O “mesa” head design is a deliberate engineering choice. The integrated washer head distributes the clamping load over a wider surface area of the pump’s mounting flange. This is critical to prevent the hard steel bolt from cracking the (provável) aluminum pump housing, and it also resists loosening from the constant vibration of the diesel engine. A integridade do Bomba de direção hidráulica FAW‘s mount is entirely dependent on these two high-strength bolts.
A tabela a seguir fornece o completo, detalhamento de todos 3 components identified in the ‘Power Steering Pump’ diagrama para o trator FAW CA4251P66K24T1A3E5. Um serviço profissional da Bomba de direção hidráulica FAW requires replacing the gasket.
| Marca | Parte não. | Nome da peça | Quantidade |
|---|---|---|---|
| 1 | Q1841030 | Parafuso de flange sextavado, haste grossa (Tipo padrão) | 2 |
| 2 | 3407020-93W-C00 | Conjunto da bomba de direção hidráulica (conforme amostra) | 1 |
| 3 | 3407024-26D | Bomba de direção com força de junta | 1 |
As especificações para o Bomba de direção hidráulica FAW são definidos por sua função como um sistema de alta pressão, gear-driven hydraulic pump. A confiabilidade do Bomba de direção hidráulica FAW is critical for vehicle control.
| Aplicação em veículos | FAW Jiefang CA4251P66K24T1A3E5 6×4 Trator |
| Grupo de Componentes | Bomba de direção hidráulica FAW |
| Conjunto da bomba principal P/N | 3407020-93W-C00 |
| Tipo de bomba | Positive Displacement (Vane or Gerotor Type) |
| Sistema de acionamento | Direct-driven (from Engine Timing Gear) |
| Internal Regulation | Internal Flow Control Valve & Pressure Relief Valve |
| Main Gasket P/N | 3407024-26D (Mounting Flange Gasket) |
| Fixadores de montagem | 2x Hex Flange Bolts (Q1841030) |
| Associated Fluid | Power Steering Hydraulic Fluid |
| Função Primária | Generates high-pressure hydraulic fluid to provide steering assist, reducing driver effort. |
Peças FAW, incluindo o conjunto do bloco de cilindros, são embalados com cuidado para garantir uma entrega segura. Cada componente é protegido por materiais de proteção para evitar danos durante o transporte. A rede logística garante envios pontuais em todo o mundo, apoiando operações de manutenção eficientes. Abaixo está uma imagem ilustrando a embalagem padrão para peças de caminhão FAW, mostrando a atenção aos detalhes no manuseio e armazenamento.
Esta abordagem de embalagem minimiza o risco de corrosão ou danos por impacto, garantindo que peças como o conjunto do bloco de cilindros FAW cheguem em perfeitas condições. Os clientes podem confiar na logística da FAW para obter qualidade e confiabilidade consistentes.