Крыша FAW в сборе: The 33 Критические компоненты, которые управляют вашими механизмами

Добро пожаловать в это важное техническое руководство по Крыша FAW в сборе (Часть №. 1702111БА9П). Этот компонент является “Top Cover” или “Shifter Tower” assembly for the main gearbox in the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач. Это полный “логика” system that translates driver input into gear selection.

The Крыша FAW в сборе is the command center for the manual transmission. It is not part of the vehicle’s cabin, but rather the complex, serviceable “top lid” of the transmission housing. It contains all the forks, shafts, and interlocks that physically move the synchronizers inside the gearbox. The precision of this Крыша FAW в сборе is what ensures a smooth, clean, and reliable shift.

This in-depth guide is an essential resource for professional transmission technicians and fleet managers. Мы разберем всю Крыша FAW в сборе в свой 33 исправные компоненты, including the main ‘Shift arm’ (1702226АА0Л), the ‘Shift shaft’ (1702121БА9П), the ‘Neutral switch’ (3774010-367), and all the critical detent springs and seals.

Основной компонент: The ‘Top Cover’ Жилье (1702111БА9П)

Сердце Крыша FAW в сборе is the ‘Top cover’ (1702111БА9П). This is the main structural housing, precision-cast from aluminum or iron, that bolts to the top of the main transmission case. Этот компонент является “скелет” for all the other internal control components.

This housing is not just a lid. It is precision-machined with multiple parallel bores that are designed to hold the shift shafts (или “rails”). The alignment of these bores must be perfect, as they ensure the shift forks are held in the exact correct position over the synchronizer sleeves. Any warping or damage to this main housing will make shifting impossible. This core component is the foundation of the Крыша FAW в сборе.

This ‘Top cover’ also serves as the main sealing surface. It is sealed to the transmission case by a large gasket (нет в списке) to prevent gear oil from leaking out. The ‘Dust cover-top cover’ (1702231EA7G) is a critical rubber boot that seals the point where the main shift arm (1702226АА0Л) exits the housing, предотвращение воды, пыль, and road grime from entering the transmission and contaminating the oil. Весь Крыша FAW в сборе is designed as a sealed unit.

The “Логика” 1: Shift Linkage (Shafts, Arms, and Forks)

The “логика” принадлежащий Крыша FAW в сборе is how it converts the driver’s “H-pattern” shift into the movement of a single, specific shift fork. This begins with the ‘Shift arm’ (1702226АА0Л), which is the main lever that the external gear stick connects to. This arm pivots on the ‘Shaft-shift’ (1702121БА9П), a hardened steel shaft.

When the driver moves the stick left or right (selecting a “gate,” НАПРИМЕР., 1-2 против 3-4), this ‘Shift arm’ moves the ‘Shaft-shift’ to line up with a specific ‘Shift fork head/lug’ (1702226БА9П). When the driver pushes the stick forward or back, the arm then pushes or pulls this specific lug.

This ‘Shift fork head/lug’ is attached to a rail, which in turn is attached to the main shift forks (detailed in Assembly 153). This action slides the fork, engaging the gear. The ‘Sliding bushing-top cover’ (1702168BA9P and 1702214BA9P) units are the low-friction bronze bushings that allow the shift shafts to slide smoothly with minimal effort. This mechanical logic is the “мышца” принадлежащий Крыша FAW в сборе.

The “Логика” 2: Detent and Interlock System

The Крыша FAW в сборе also contains a critical “detent” система. This is what gives the shifter its positive “click” and prevents the transmission from vibrating out of gear. This system is comprised of springs, plungers, and balls:

• ‘Return spring-high gear’ (1702131Б73Б)
• ‘Return spring-low gear’ (1702132БА9П)
• ‘Spring’ (1702146-A6H)
• ‘Steel ball’ (Q967105)
• ‘Spring-reverse pin’ (1702147БА9П)
• ‘Plunger’ (1702146-А8Л)

Each shift rail (вал) has small grooves or “detents” machined into it (one for each gear, and one for neutral). A ‘Plunger’ and ‘Spring’ are aligned with each rail. When a gear is selected, the ‘Steel ball’ or ‘Plunger’ is forced by the spring into one of these grooves. Этот “locks” the rail in place, preventing vibration from “popping it out of gear.” The “click” the driver feels is this ball dropping into its groove. These springs are a critical part of the Крыша FAW в сборе‘s “feel.”

Этот Крыша FAW в сборе also contains the interlock system, which is a set of pins (like ‘Parallel cut pin’ 1701656-A2K and ‘Post pin’ 1702242-A9p) that physically block the *other* shift rails from moving once one rail has been selected. This is the safety logic that makes it impossible to select two gears at once.

Электронный датчик: Neutral Switch (3774010-367)

A key electronic component of the Крыша FAW в сборе is the ‘Neutral switch assembly’ (3774010-367). This is a simple but critical sensor. It is a plunger-style switch that is threaded into the ‘Top cover’.

When all the shift rails are in their “neutral” позиция, a groove aligns under this switch, allowing its plunger to drop, which closes an electrical circuit. This sends a “Neutral” signal to the truck’s main ECU. This signal is essential for:

• **Safety Start:** It is part of a safety interlock that prevents the engine from being started “in gear.”
• **Idle Control:** It tells the ECU that the engine is not under load, allowing it to enter its “idle” map for fuel efficiency.
• **PTO Logic:** It is often used as a prerequisite for engaging a Power Take-Off (ВОМ).

A failure of this single switch on the Крыша FAW в сборе can lead to a “no-start” condition that can be very difficult to diagnose.

Уплотнения, Vents, and Fasteners

The Крыша FAW в сборе must be perfectly sealed from the elements but also able to “breathe.” The ‘Breather plug assembly’ (1702165-А8Л) is a one-way “cap” that allows internal pressure (which builds as the gear oil heats up) to vent *out*, but prevents water and dust from getting *in*.

The ‘Oil seal assembly’ (1702235-A7G) is a critical radial seal that is installed on the main ‘Shaft-shift’ (1702121БА9П). It prevents the gear oil inside the Крыша FAW в сборе from leaking out where the shift shaft enters.

Весь Крыша FAW в сборе is held together and mounted with a large number of high-grade fasteners. This includes ‘Hex cap bolts’ (CQ1501040), «Болты с шестигранной головкой’ (Q1840825), ‘Hex screw plugs’ (1702148-A6H, 1702149-А8Л), ‘Spring gaskets’ (Q40310), and ‘Elastic retaining rings’ (Q43322, Q43226, Q43034, Q43230) to secure all the pins and shafts.

Крыша FAW в сборе (Верхняя крышка коробки передач) Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 33 components identified in the ‘Top Cover Assembly’ (referred to as the Крыша FAW в сборе) схема трактора FAW CA4251P66K24T1A3E5.

Технические характеристики и контекст сборки

Технические характеристики Крыша FAW в сборе are defined by its function as the transmission’s mechanical “логика” board. Этот Крыша FAW в сборе (Top Cover) is responsible for all gear selection.