Дополнительный блок FAW, левый верхний центральный вал в сборе: Комплексный анализ 4 Основные компоненты

Welcome to this comprehensive technical analysis of the Дополнительный блок FAW, левый верхний центральный вал в сборе. This is a critical set of components within the auxiliary “дополнительный ящик” (or range box) of the transmission for the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач.

The Дополнительный блок FAW, левый верхний центральный вал в сборе это “counter-shaft” for the transmission’s auxiliary section. Его “логика” is to handle the immense torque required for the “высокий” и “низкий” range split, effectively doubling the truck’s available gears. Эта сборка, which includes the shaft, подшипники, and locating washers, is essential for the transmission’s durability.

This in-depth guide is a vital resource for professional transmission technicians and parts managers. Мы разберем всю Дополнительный блок FAW, левый верхний центральный вал в сборе в свой 4 main serviceable part numbers, explaining the critical function of the ‘Welded countershaft assembly’ (1701515FA0L), its tapered roller bearings, and its precision locating shims.

Основной компонент: Welded Countershaft (1701515FA0L)

Основа Дополнительный блок FAW, левый верхний центральный вал в сборе is the ‘Welded countershaft assembly-sub box’ (1701515FA0L). В списке деталей указано количество двух штук., which is a critical detail. This indicates the transmission’s auxiliary box uses a **twin-countershaft design** (или “twin-shaft”) for its range selection.

This design splits the torque coming from the main box, sending 50% through this “Left Upper” Дополнительный блок FAW, левый верхний центральный вал в сборе и 50% through its (идентичный) twin. This dramatically increases the torque-handling capacity of the gearbox, allowing for a more compact and durable design.

Термин “Welded assembly” signifies that the gears (НАПРИМЕР., the high/low range drive gears) are permanently attached to the shaft, likely via friction welding. This creates a single, incredibly strong component that is not serviceable in individual pieces. Весь Дополнительный блок FAW, левый верхний центральный вал в сборе must be replaced as a unit if a gear tooth is damaged.

The Bearing System: Tapered Roller Bearings (33109-1 & 33109-2)

Каждый Дополнительный блок FAW, левый верхний центральный вал в сборе is supported at both ends by a ‘Tapered roller bearing’. The parts list breaks this down into its two serviceable components:

• ‘Outer ring-tapered roller bearing’ (33109-1) – 4 единицы
• ‘Inner ring-tapered roller bearing’ (33109-2) – 4 единицы

The quantities (4 of each) perfectly equip the two ‘Welded countershaft’ (1701515FA0L) units with a front and rear bearing set. Tapered roller bearings are essential for this application. Unlike standard ball bearings, they are designed to handle extreme loads in *two* directions simultaneously:

**1. Radial Load:** The immense separating force of the helical-cut gears pushing away from each other.

**2. Axial Load (Thrust):** The “толкать/тянуть” force that is naturally generated by the angled teeth of the helical gears. A ball bearing would be destroyed by this thrust, but a tapered bearing is designed for it. This is a critical piece of logic in the Дополнительный блок FAW, левый верхний центральный вал в сборе.

The ‘Outer ring’ (или “cup”) is pressed into the transmission’s rear housing. The ‘Inner ring’ (или “cone,” which includes the rollers) is pressed onto the journal of the Дополнительный блок FAW, левый верхний центральный вал в сборе.

Precision Logic: The Locating Washer (1701518-А0Л) and Preload

The final component listed is the ‘Locating washer’ (1701518-А0Л), with a quantity of two (one for each Дополнительный блок FAW, левый верхний центральный вал в сборе). Это не простая мойка; it is a **precision shim**.

The most critical aspect of installing tapered roller bearings is setting the “preload.” This is the precise amount of “squeeze” or axial pressure applied to the bearings.

• **Too Loose:** If the preload is too loose, а Дополнительный блок FAW, левый верхний центральный вал в сборе will have “окончание игры,” allowing it to move back and forth. This causes the helical gears to misalign, leading to a loud “whine,” высокочастотная вибрация, and eventual gear-tooth failure.
• **Too Tight:** If the preload is too tight (over-shimmed), the bearings will have no running clearance. This creates immense friction and heat, which will seize, “blue,” and destroy the new bearings in a very short amount of time.

This ‘Locating washer’ является а “выборочная подгонка” прокладка. During a rebuild, a technician uses a dial indicator to measure the end-play and then selects a washer of the *exact* thickness required (from a set of various-thickness shims, all under this part number “family”) to achieve the perfect, factory-specified preload. This shimming process is the “логика” в Дополнительный блок FAW, левый верхний центральный вал в сборе and is the most important step for a successful transmission repair.

Service and Diagnostics

A failure within the Дополнительный блок FAW, левый верхний центральный вал в сборе is a major event. The primary cause of failure is almost always lubrication-related. If the transmission oil level is low, or if the oil is contaminated with water or debris, the bearings (33109-1, 33109-2) will be the first components to fail.

The main diagnostic symptom of a failing Дополнительный блок FAW, левый верхний центральный вал в сборе is a loud, pronounced **whining or growling noise** that is directly related to vehicle speed, not engine speed. The noise will be present in *all* gears (both high and low range) and will change pitch as the truck accelerates or decelerates. This is because this shaft is “downstream” of the main gearbox and is always spinning in relation to road speed.

A secondary symptom is the presence of a large amount of “glitter” or fine metal shavings in the sub-box’s oil during a service. This is the hardened surface of the bearing or gear (1701515FA0L) “питтинг” и “spalling” (flaking off) due to overload or lack of lubrication. Обслуживание Дополнительный блок FAW, левый верхний центральный вал в сборе requires a complete teardown of the auxiliary box, replacement of all bearings and shims, and a careful re-setting of the bearing preload using the ‘Locating washer’ (1701518-А0Л).

FAW Sub-Box Left Upper Centre Shaft Assembly Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 4 component types identified in the ‘Sub-Box Left Upper Centre Shaft Assembly’ схема трактора FAW CA4251P66K24T1A3E5. Этот Дополнительный блок FAW, левый верхний центральный вал в сборе is a complete set for two countershafts.

Технические характеристики и контекст сборки

Технические характеристики Дополнительный блок FAW, левый верхний центральный вал в сборе определяются своей функцией как высокомоментный, twin-countershaft system. Весь Дополнительный блок FAW, левый верхний центральный вал в сборе set must be installed with precision preload.