FAW High-Mounted Front Position Lamp: A Critical Analysis of 2 Core Safety Components

Welcome to this critical technical guide on the FAW High-Mounted Front Position Lamp (حَشد 571). This is the complete, high-visibility “clearance” أو “marker” light system for the high-roof cab corners of the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This assembly is a primary safety and legal compliance “logic” system, essential for vehicle visibility.

ال FAW High-Mounted Front Position Lamp هو “logic” system with one vital function: to clearly and unmistakably mark the two widest, highest points of the truck’s cab. This ‘Left front position lamp assembly’ (3731015-A02) and ‘Right front position lamp assembly’ (3731020-A02) system provides a clear visual profile for other drivers at night or in low-visibility conditions.

This in-depth guide is an essential resource for professional technicians, fleet safety managers, and parts specialists. We will deconstruct the entire FAW High-Mounted Front Position Lamp assembly into its 2 serviceable component types (a total of 6 pieces). We will analyze the critical “logic” of these lamps, their likely LED construction, their integration with the ‘Combination Switch’ (حَشد 559), and the specific, vibration-proof ‘Combination bolt’ (Q2360630F6) fasteners used to mount them.

المكونات الأساسية: The ‘Left’ (3731015-A02) & ‘Right’ (3731020-A02) Assemblies

The main components of this system are the ‘Left front position lamp assembly’ (3731015-A02) and the ‘Right front position lamp assembly’ (3731020-A02). These are the two complete “clearance” أو “marker” light units. They are designed as mirror images of each other and are mounted high on the cab, near the top corners.

بناء: Each unit is a “logic” حَشد. It consists of a durable, high-impact polycarbonate lens (legally mandated to be **amber** or **yellow** in color for forward-facing position lamps) that is hermetically sealed to a robust ABS or polymer housing. This sealing is critical. ال FAW High-Mounted Front Position Lamp is constantly exposed to high-pressure wind, مطر, الثلج, and bug impacts. A failed seal will allow moisture to enter, corroding the bulb’s contacts, fogging the lens, and causing an electrical short.

Illumination “Logic”: The light source for the FAW High-Mounted Front Position Lamp is almost certainly a high-intensity, wide-angle LED (Light Emitting Diode). This is a critical “logic” choice for several reasons:

• 1. Vibration Resistance: The lamp is mounted on the cab, which is subject to constant, high-frequency vibration. The fragile filament of a traditional incandescent bulb would constantly break in this environment. An LED is a solid-state, “shock-proof” device with no filament, making it virtually immune to this vibration.
• 2. Power Consumption: These lights are on *anytime* the headlights or parking lights are on (أي., for hours at a time). An LED draws a fraction of the power of an incandescent bulb, reducing the electrical load on the truck’s alternator (حَشد 33) and battery system.
• 3. Lifespan: The LED is designed to last for tens of thousands of hours, often the entire life of the truck, making this FAW High-Mounted Front Position Lamp أ “fit-and-forget” maintenance component. This is critical for a lamp mounted in a hard-to-reach, high location on the cab.

ال “Logic” of Position vs. ID Lamps

ال “logic” of the FAW High-Mounted Front Position Lamp is often confused with the “ID Lights” (حَشد 561), but they serve two distinct, legally-mandated purposes.

1. Identification (ID) Lamps: These are the *three* amber lights grouped in the *center* of the cab roof (like 3712010-99A). Their “logic” is to signal that the vehicle is **”زيادة 80 inches (2.03م) wide.”**

2. Position (التخليص) Lamps: ال FAW High-Mounted Front Position Lamp (3731015-A02 / 3731020-A02) are the *two* amber lights located at the *outermost corners* of the cab. Their “logic” is to define the **”exact width and height”** of the vehicle.

هذا “logic” is a critical safety system. When a driver at night sees these two wide-set amber lights, they can instantly and accurately judge the truck’s width. This prevents “clipping” accidents when passing, in tight corners, or at toll booths. هذا FAW High-Mounted Front Position Lamp works in conjunction with the side markers (حَشد 569) and the rear combination lamps (حَشد 568) to create a complete 360-degree “profile” of the vehicle in the dark.

A non-functional FAW High-Mounted Front Position Lamp is a serious safety violation. It makes the truck’s width “invisible” at night. This can result in a “fix-it” ticket or an “out-of-service” order during a roadside inspection. The reliability of this FAW High-Mounted Front Position Lamp is directly tied to the fleet’s legal compliance and safety record.

Core Component 2: The Fastener “Logic” (Q2360630F6)

The second component of the FAW High-Mounted Front Position Lamp assembly is the hardware that mounts it: the ‘Cross recessed pan head screw assembly’ (Q2360630F6). The parts list calls for four of these, which is a pair of screws for each of the two ‘Front position lamp assembly’ وحدات.

This fastener is a key part of the installation “logic” for the FAW High-Mounted Front Position Lamp.

1. “Combination” Logic: ال “حَشد” (组合螺钉) designation is critical. This is not just a standard screw. It is a pre-assembled fastener that has a captive (non-removable) spring washer and flat washer already attached to its shaft. هذا “logic” is essential for two reasons:

• Vibration Resistance: The captive “غسالة الربيع” (lock washer) exerts constant tension on the screw head, making it impossible for the fastener to vibrate loose from road shock.
• Error-Proofing: It is impossible for the technician or assembly line worker to “forget” the washers, ensuring every FAW High-Mounted Front Position Lamp is installed with the correct anti-vibration hardware.

2. Pan Head “Logic”: ال “pan head” (盘头) design provides a wide, flat clamping surface. This is critical for mounting the plastic housing of the FAW High-Mounted Front Position Lamp. It distributes the clamping force, preventing the screw from creating a “stress point” and cracking the lamp’s mounting flange. هذا “logic” also ensures the lamp’s rubber/foam gasket is evenly compressed, creating a perfect watertight seal against the cab roof. A failure of these fasteners would cause the FAW High-Mounted Front Position Lamp to vibrate, leak, and ultimately fail.

FAW High-Mounted Front Position Lamp Parts List

The following table provides the complete, detailed breakdown of all 2 component types (totaling 6 pieces) identified in the ‘High-Mounted Front Position Lamp’ (571) diagram for the FAW CA4251P66K24T1A3E5 tractor.

Technical Specifications and Assembly Context

The specifications for the FAW High-Mounted Front Position Lamp are defined by its function as a critical, legally-mandated safety warning light. ال FAW High-Mounted Front Position Lamp is essential for vehicle visibility and legal compliance.