Conjunto de cilindro auxiliar FAW: O 8 Componentes abrangentes explicados

Bem-vindo a este guia técnico abrangente sobre o Conjunto de cilindro auxiliar FAW. Este é o pneumático completo “músculo” e “lógica” system that actuates the high/low range splitter for the auxiliary “subcaixa” of the FAW Jiefang CA4251P66K24T1A3E5 6×4 trator semirreboque diesel.

O Conjunto de cilindro auxiliar FAW is the component that physically moves the synchronizer fork to shift the transmission from its “baixo” faixa (for pulling heavy loads) to its “alto” faixa (for highway cruising). It is powered by the truck’s main compressed air system and controlled by an electronic solenoid.

This in-depth guide is a critical resource for professional transmission technicians and fleet managers. Vamos desconstruir todo Conjunto de cilindro auxiliar FAW em seu 8 componentes reparáveis, including the main cylinder and shaft, the shift fork, the air fittings, and the critical locking hardware.

Componente principal: O conjunto do cilindro (1701640-A2V)

O coração do Conjunto de cilindro auxiliar FAW is the ‘Cylinder assembly-sub box’ (1701640-A2V). This is the main pneumatic actuator. This component is a high-reliability air cylinder, typically mounted to the side of the transmission’s rear housing.

Isso é “lógica” is simple but powerful. The cylinder contains an internal piston and a robust seal. Quando o motorista vira o “range selector” switch in the cab, an electronic solenoid (uma parte separada) directs high-pressure air (100+ PSI) from the truck’s main air system into one of the ’90-degree elbow joint assembly-cylinder’ (1701755-A8L) portos.

This blast of air slams the piston forward, moving the ‘Cylinder fork shaft assembly’ (1701640Aa9p, a sub-part) that is attached to it. When the driver selects the other range, the solenoid vents the air from the first port and pressurizes the second port, slamming the piston and shaft in the opposite direction. This pneumatic “músculo” provides the several hundred pounds of force required to move the shift fork.

A failure of the internal piston seal in this Conjunto de cilindro auxiliar FAW will cause an air leak. This leak is critical: it not only prevents the transmission from shifting ranges but also creates a parasitic drain on the truck’s main air brake system, o que é um grande risco à segurança. A confiabilidade do Conjunto de cilindro auxiliar FAW is therefore paramount.

O “Músculo”: Shift Fork (1701632-A2V)

The ‘Fork – sub-box synchronizer’ (1701632-A2V) is the mechanical link between the air cylinder and the gearbox internals. Este componente do Conjunto de cilindro auxiliar FAW é um serviço pesado, aço forjado “yoke.”

It is attached to the end of the pneumatic ‘Cylinder fork shaft’ (1701640-A2V). The two “tines” of the fork ride in a deep groove on the “sliding sleeve” of the sub-box output shaft’s synchronizer (veja Montagem 149). When the air cylinder moves the shaft, this fork moves with it, physically sliding the synchronizer hub to engage either the high-range or low-range gear set.

This fork is a high-wear, high-stress component. O “almofadas” on the end of the fork tines are in constant, light contact with the spinning synchronizer sleeve. Over hundreds of thousands of shifts, these pads can wear down. Excessive wear will cause a “sloppy” mudança, incomplete gear engagement, ou “popping out” of range. A cracked fork is a critical failure of the Conjunto de cilindro auxiliar FAW.

Air Supply and Plumbing Components

O Conjunto de cilindro auxiliar FAW is powered by air, requiring a leak-free plumbing system. The two ’90-degree elbow joint assembly-cylinder’ (1701755-A8L) fittings are the “entrada” e “tomada” ports for the air cylinder.

These are high-pressure, threaded fittings that allow the air lines to be connected at a 90-degree angle, which is essential for routing hoses in the tight confines of the transmission tunnel.

The ‘Terminal-type pipe joint – tapered pipe connection’ (C063005) é o principal “fornecer” encaixe. It is likely where the main air-feed line from the solenoid block connects to the rigid piping of the Conjunto de cilindro auxiliar FAW.

A leak in any of these high-pressure fittings is a major fault. It will cause the Conjunto de cilindro auxiliar FAW to be weak or unresponsive. Mais importante, it creates a parasitic leak on the main brake system, forcing the engine’s air compressor to run constantly, which is a major safety concern.

The Critical Fastener & Locking Wire System (1701578-A2K)

O hardware de montagem para o Conjunto de cilindro auxiliar FAW is designed for maximum security in a high-vibration environment. Os 'parafusos de flange sextavados’ (Q1841040S) e 'Juntas de mola’ (Q40310) are used to secure the main cylinder body to the transmission housing. The flange head and spring washer work together to provide a high-clamping force that resists vibration.

No entanto, the most critical fasteners in this Conjunto de cilindro auxiliar FAW are the ‘Hex head bolt with hole’ (1701633-A7G) unidades. A lista pede dois. These are used for a “cannot-fail” conexão, almost certainly to attach the ‘Fork’ (1701632-A2V) to the ‘Cylinder fork shaft’.

These bolts have a hole drilled through their heads. This is for the ‘Steel locking wire’ (1701578-A2K). This is a critical safety “lógica.” After the technician torques these bolts to the correct specification, this steel wire is threaded through the holes in both bolt heads and then twisted taut.

Esse “lock wire” makes it physically impossible for the bolts to rotate or back out from vibration. If these bolts came loose, the shift fork would detach from the cylinder, and the driver would be permanently stuck in whatever range they were in (either high or low). A missing lock wire is a sign of an incomplete repair and a critical safety risk. This entire hardware set is essential to the function of the Conjunto de cilindro auxiliar FAW.

FAW Auxiliary Cylinder Assembly Parts List

A tabela a seguir fornece o completo, detalhamento de todos 8 components identified in the ‘Auxiliary Cylinder Assembly’ diagrama para o trator FAW CA4251P66K24T1A3E5. O Conjunto de cilindro auxiliar FAW é o “músculo” for the transmission’s range selector.

Especificações Técnicas e Contexto de Montagem

As especificações para o Conjunto de cilindro auxiliar FAW are defined by its function as a high-force, pneumatic actuator for the transmission’s range selector. O Conjunto de cilindro auxiliar FAW is a safety-critical part.