Front Door Lock Mechanism: Deconstructing 7 Critical Parts for Flawless Security

Welcome to this in-depth analysis of the Front Door Lock Mechanism, a critical security and access system for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This guide deconstructs the 7 critical component types (excluding the door shell) that form this electro-mechanical system for flawless, reliable operation.

The Front Door Lock Mechanism in a heavy-duty truck is not a simple latch. It is a complete electro-mechanical system designed to provide security (power locking), safety (reliable egress), and durability against hundreds of thousands of door slams, extreme vibration, and environmental contamination from dust and water. This analysis will break down the core electric lock body, the inner and outer handles, and the specialized, vibration-proof fasteners.

Core 1: The ‘Security & Electric’ Logic (The Core Lock Body)

This component is the heart of the Front Door Lock Mechanism. It is a sealed, integrated unit that contains both the mechanical latch and the electrical actuator for the power-locking function.

1. Component: ‘Left front door electric lock body assembly’ (6105025AA01) – Qty 1
2. Component: ‘Right front door electric lock body assembly’ (6105030AA01) – Qty 1
These (Comp 4) are the core assemblies. The ‘electric lock body’ name is key, signifying they are not simple mechanical latches. They are specific to the Left (driver) and Right (passenger) sides and are not interchangeable.

The Electric Logic is for convenience and security. A small internal electric motor (actuator) receives a signal from the truck’s central locking system (key fob or dash switch). This motor drives a gear to move the lock from the “safe” to “unlocked” position, eliminating the need to use a key.

The Mechanical Logic is for safety and strength. Housed within the assembly is the heavy-duty mechanical latch. This is the “claw” mechanism that physically grabs the striker pin on the truck’s B-pillar. This latch must be strong enough to keep the door shut during an impact and to withstand the immense forces of chassis flex when the dump truck is on uneven terrain.

The Symmetrical Logic is critical. The part numbers 6105025AA01 (Left) and 6105030AA01 (Right) are mirror-images. The orientation of the mounting holes, the actuator, and the levers for the inner and outer handles are all reversed.

This core Front Door Lock Mechanism assembly is the central hub. All other components—the inner handle, the outer handle, and the key cylinder—all connect to this unit via rods or cables. A failure in this single unit, whether electrical or mechanical, will compromise the entire door’s function.

Core 2: The ‘Exterior Access’ Logic (The Outer Handle)

This is the primary human interface from outside the cab, designed for extreme durability and reliable operation in all weather conditions.

1. Component: ‘Left front door outer handle assembly’ (6105105-A01) – Qty 1
2. Component: ‘Right front door outer handle assembly’ (6105110-A01) – Qty 1
These (Comp 2) are the pull-style outer handles. As ‘assemblies’, they include the handle, the pivot mechanism, and the internal lever that actuates the lock.

The Actuation Logic is simple but robust. When the unlocked handle is pulled, its internal lever pulls a connecting rod or cable. This rod travels down inside the door skin and connects to a specific lever on the Front Door Lock Mechanism (Comp 4), triggering the latch to release.

The Durability Logic is paramount. This handle is made from high-impact, UV-stabilized polymer to withstand millions of cycles without breaking. It is designed to be oversized for use with a gloved hand and must function when caked in mud, dust, or ice. The pivot pins are sealed to prevent corrosion and sticking.

These handles also house the physical key cylinder, which provides a manual override for the Front Door Lock Mechanism in case of a dead battery.

Core 3: The ‘Interior Egress’ Logic (The Inner Handle)

This component is the critical safety-of-life part of the Front Door Lock Mechanism, allowing the operator to exit the vehicle reliably.

1. Component: ‘Left front door inner handle assembly’ (6105075-B27-C00) – Qty 1
2. Component: ‘Right front door inner handle assembly’ (6105080-B27-C00) – Qty 1
These (Comp 7) are the interior handles, complete with their bezels and lever mechanisms. The ‘B27-C00’ suffix likely denotes a specific trim color (e.g., grey) and finish.

The Egress Logic is its sole function. This handle must be able to actuate the Front Door Lock Mechanism to release the latch, regardless of whether the door is locked or unlocked, and *regardless* of whether the truck has electrical power.

This mechanical override is a fundamental safety design. Like the outer handle, it connects to the core lock body (Comp 4) via a separate rod or cable. This redundancy ensures that if one linkage fails, the other may still function.

The design is typically a low-profile lever to prevent snagging, but it must be robust enough for high-use. The ‘assembly’ includes the plastic housing that snaps or screws into the main door trim panel.

Core 4: The ‘Vibration-Proof’ Logic (The Fastener System)

This group represents the complete set of 22 specialized fasteners that secure the Front Door Lock Mechanism components. Their selection is critical for a high-vibration environment.

1. Component: ‘Cross recessed… combination screw’ (Q2360612F6) – Qty 4
These (Comp 3) are ‘combination screws’, which have pre-installed, captive washers. The quantity of 4 strongly suggests they are for the outer handles (Comp 2), with 2 screws per handle.

2. Component: ‘Cross recessed countersunk head screw’ (Q2540612F6) – Qty 6
3. Component: ‘Multi-tooth conical elastic washer’ (Q41406F6) – Qty 6
This (Comp 5 & 6) is a matched set. The countersunk screw sits flush. The ‘multi-tooth’ washer (Comp 6) is a high-vibration locking washer that bites into the metal to prevent loosening. These 6 sets are for the core electric lock bodies (Comp 4), 3 per side, which take the most slam-force.

4. Component: ‘Cross recessed flat round head combination screw’ (Q2360612) – Qty 6
These (Comp 8) are more combination screws, likely for the inner handles (Comp 7), 3 per side.

The Anti-Vibration Logic is the unifying theme. A dump truck door is a high-abuse component. Every fastener listed is either a ‘combination screw’ (with a built-in spring washer) or paired with a ‘multi-tooth’ washer. This is a deliberate engineering choice to lock the threads and guarantee the Front Door Lock Mechanism does not rattle loose.

Front Door Lock Mechanism: Complete 8-Part Breakdown

The following table provides the complete, detailed breakdown of all 8 component types in the Front Door Lock Mechanism assembly (System 143) for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the Front Door Lock Mechanism are defined by its role as a complete, electro-mechanical security and safety system.