FAW Нижний правый центральный вал в сборе дополнительного блока: Внутри его 4 Критические компоненты

Добро пожаловать в это важное техническое руководство по FAW Нижний правый центральный вал в сборе дополнительного блока. This is a complete, load-bearing gear and shaft set for the auxiliary “дополнительный ящик” (or range box) передачи, designed for the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач.

The FAW Нижний правый центральный вал в сборе дополнительного блока (Часть №. 1701515FA0L) это “counter-shaft” for the transmission’s High/Low range selector. In the heavy-duty twin-countershaft design of this gearbox, this shaft is one of two (a matched “upper” и “lower” набор) that splits the engine’s torque, providing immense durability.

This in-depth guide is an essential resource for professional transmission technicians and parts specialists. Мы разберем всю FAW Нижний правый центральный вал в сборе дополнительного блока в свой 4 исправные компоненты, including the main ‘Welded countershaft assembly’, its precision ‘Tapered roller bearings’, and the critical ‘Locating washer’ for setting preload. The integrity of the FAW Нижний правый центральный вал в сборе дополнительного блока is paramount.

Основной компонент: Welded Countershaft (1701515FA0L)

Сердце FAW Нижний правый центральный вал в сборе дополнительного блока is the ‘Welded countershaft assembly-sub box’ (1701515FA0L). This is the main shaft and gear cluster for the auxiliary transmission. This transmission uses a **twin-countershaft** (или “twin-shaft”) sub-box design. This means the load from the main box is split 50/50 between two shafts: этот FAW Нижний правый центральный вал в сборе дополнительного блока (а “внизу справа”) and its “left upper” twin.

Этот “torque-splitting” design is the hallmark of a heavy-duty transmission. It allows the gearbox to handle the immense torque of a diesel engine using more compact components, as the load on each gear tooth is effectively halved. The “Welded assembly” обозначение имеет решающее значение: it means the drive gears for the high/low range are permanently friction-welded to the shaft, создание единого, non-serviceable component of incredible strength. Этот FAW Нижний правый центральный вал в сборе дополнительного блока is forged from high-manganese steel and case-hardened. A failure of a gear tooth requires the replacement of the entire FAW Нижний правый центральный вал в сборе дополнительного блока.

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

Each FAW Нижний правый центральный вал в сборе дополнительного блока is supported at its front and rear by a heavy-duty tapered roller bearing. The parts list correctly breaks this bearing (Тип 33109) into its two serviceable components:

• **’Outer ring-tapered roller bearing’ (33109-1):** Quantity of 2. Это “cup,” which is pressed into the transmission’s housing.
• **’Inner ring-tapered roller bearing’ (33109-2):** Quantity of 2. Это “cone” (which contains the rollers), and it is pressed onto the journals of the FAW Нижний правый центральный вал в сборе дополнительного блока.

The quantities of 2 each are for *this specific shaft* (one for the front, one for the rear). The *total* for the entire sub-box would be double this, как видно в “Left Upper” shaft assembly.

Tapered roller bearings are essential for this application. The helical (angled) gear teeth on the FAW Нижний правый центральный вал в сборе дополнительного блока create immense **axial load** (thrust, or a constant push/pull force) in addition to the **radial load** (the separating force). A standard ball bearing would be quickly destroyed by this axial thrust. Tapered bearings are specifically engineered to handle both forces at once, which is critical for the long-term survival of the FAW Нижний правый центральный вал в сборе дополнительного блока.

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

The final component of the FAW Нижний правый центральный вал в сборе дополнительного блока is the ‘Locating washer’ (1701518-А0Л). The parts list shows a quantity of one, as this specific shaft (а “внизу справа”) is the one that is “shimmed” to set the preload for the entire twin-shaft assembly. This is not a simple washer; it is a **precision shim**.

This shim’s “логика” is to set the **bearing preload**. This is the single most critical step in a transmission rebuild. Tapered roller bearings cannot be simply installed; they must be “squeezed” together with a precise, pre-calculated amount of force.

* **If the preload is too loose** (shim is too thin), а FAW Нижний правый центральный вал в сборе дополнительного блока will have “end-play,” allowing it to move back and forth. This misalignment causes the helical gear teeth to mesh improperly, leading to a loud, пронзительный “whine,” вибрация, and eventual gear tooth failure.

* **If the preload is too tight** (shim is too thick), the bearings are “crushed” together and have no running clearance. This creates immense friction, which overheats, “blues,” and seizes the bearings, destroying the FAW Нижний правый центральный вал в сборе дополнительного блока.

During assembly, a technician must install the shaft, measure the end-play with a dial indicator, and then select a ‘Locating washer’ of the *exact* required thickness from a “selective fit” набор (all under the 1701518 part number family). This ensures the FAW Нижний правый центральный вал в сборе дополнительного блока spins freely with zero end-play, guaranteeing a quiet and long-lasting repair.

Service and Failure Diagnostics

A failure within the FAW Нижний правый центральный вал в сборе дополнительного блока is a major internal transmission fault. The primary cause is almost always lubrication failure (low or contaminated oil) or an incorrect preload setting during a previous repair.

The main symptom of a failing FAW Нижний правый центральный вал в сборе дополнительного блока bearing is a loud, constant **whining or growling noise** that is tied to vehicle speed, not engine RPM. The noise will be present in all gears (1-12) and will change in pitch only as the truck speeds up or slows down. This is because the auxiliary sub-box is “downstream” of the main box, and its shafts are always spinning in relation to the driveshaft speed.

A secondary, critical failure mode in a twin-countershaft design is **gear timing**. The two shafts (этот FAW Нижний правый центральный вал в сборе дополнительного блока and its twin) должно быть “timed” so their helical gear teeth engage the main shaft at the exact same instant. If one shaft is “off” by a single tooth, the entire torque load will be placed on one shaft instead of being split 50/50. This will rapidly destroy the overloaded FAW Нижний правый центральный вал в сборе дополнительного блока, stripping its gear teeth.

FAW Lower Right Centre Shaft Assembly Of The Sub-Box Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 4 components identified in the ‘Sub-Box Lower Right Centre Shaft Assembly’ схема трактора FAW CA4251P66K24T1A3E5. Этот FAW Нижний правый центральный вал в сборе дополнительного блока is one of two matching sets in the auxiliary box.

Технические характеристики и контекст сборки

Технические характеристики FAW Нижний правый центральный вал в сборе дополнительного блока are defined by its function as one half of a high-torque, twin-countershaft system. Весь FAW Нижний правый центральный вал в сборе дополнительного блока set must be installed with precision preload.