FAW J6P Lower Berth: Deconstructing 9 Critical Parts for Flawless Driver Rest

Welcome to this in-depth deconstruction of the FAW J6P Lower Berth for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This is not just a bunk; it is a vital ergonomic system for driver rest, regulatory compliance, and long-haul efficiency. This guide will deconstruct the 9 critical components for flawless service.

The FAW J6P Lower Berth is an essential feature of the J6P sleeper cab. In the demanding world of dump truck operation, driver fatigue is a critical safety issue. This berth assembly is engineered to provide a stable, comfortable, and supportive rest environment, isolating the driver from the vehicle’s chassis and enabling restorative sleep.

This teardown will analyze the complete FAW J6P Lower Berth system (Part No. 7000010-B35), from its primary cushion assembly down to its structural support frame and safety baffles. For a technician, understanding this multi-component system is key to diagnosing rattles, replacing damaged frames, or ensuring the entire assembly is secure and safe.

We will explore the logic behind the multi-beam frame, the high-density foam selection, and the critical mounting hardware that ensures the FAW J6P Lower Berth remains silent and secure, even when the truck is operating on the rough terrain for which the CA3250P66K2L1T1E is designed.

Core 1: The “Comfort” Logic (The Berth Cushion Assembly)

This is the primary component that the driver interacts with. It is the mattress and support base, delivered as a single, complete assembly.

1. Component: ‘Lower Berth Assy’ (7000010-B35) – Qty 1
This (Mark 9) is the main FAW J6P Lower Berth assembly. The designation ‘Assy’ (总成) signifies it is a complete, pre-assembled unit, including the internal base, the multi-density foam core, and the outer upholstery.

The Structural Base Logic: Internally, this assembly is built on a rigid base, typically a thick, moisture-resistant composite or wood board. This board provides the structural integrity, prevents sagging, and serves as the mounting-point foundation for attaching to the frame (Core 2).

The Multi-Layer Foam Logic: The comfort of the FAW J6P Lower Berth comes from a sophisticated, multi-layer foam core. It is not a single piece of foam. It typically uses a very high-density, firm polyurethane foam as the support layer, topped with a softer, medium-density layer for comfort.

This combination is critical for providing orthopedic support to the driver’s spine and joints while also being comfortable. This design prevents the mattress from ‘bottoming out’ and ensures a long service life without developing permanent sags or divots.

The Upholstery Logic: The entire assembly is covered in a heavy-duty, automotive-grade textile. This fabric is chosen for high abrasion resistance (to withstand daily use), flame retardancy (a critical safety requirement), and ease of cleaning. It is designed to match the cab interior and is sewn with high-tensile thread to prevent seam-splitting.

The Service Logic: As a complete ‘Assy’, this FAW J6P Lower Berth component is typically replaced as a single unit. If the foam core collapses, or if the upholstery is severely damaged or contaminated, the entire 7000010-B35 assembly is unbolted from the sub-frame and a new one is installed.

Core 2: The “Structural Frame” Logic (The Welded Beams)

This group of four components forms the high-strength steel sub-frame that supports the main berth assembly (Core 1) and anchors the entire system to the cab wall.

1. Component: ‘Left Center Pipe Beam Weld Assy’ (7007015-B35) – Qty 1
This (Mark 1) is a structural support, likely one of the main cross-members. The ‘Weld Assy’ indicates it’s a pre-fabricated, non-serviceable steel component.

2. Component: ‘Right Center Pipe Beam Weld Assy’ (7007020-B35) – Qty 1
This (Mark 2) is the corresponding right-side cross-member, mirroring the left-side part to create a symmetrical, high-strength frame for the FAW J6P Lower Berth.

3. Component: ‘Left Side Pipe Beam Weld Assy’ (7007025-B35) – Qty 1
This (Mark 3) is likely the outer longitudinal beam for the left side, connecting the cross-members and providing the main mounting points to the cab body.

4. Component: ‘Right Side Pipe Beam Weld Assy’ (7007030-B35) – Qty 1
This (Mark 4) is the final piece of the four-part frame, the right longitudinal beam, which completes the rigid ‘ladder’ structure.

The Frame Logic: These four welded assemblies are the skeleton of the entire FAW J6P Lower Berth. They are made from high-strength steel (often tubular) to be both lightweight and extremely rigid. Their purpose is to create a perfectly flat, level platform that can support the weight of the driver (and the berth assembly) without flexing, sagging, or rattling.

The “Weld Assy” Logic: These are not simple pipes; they are ‘Weld Assys.’ This means they are robotically welded in a factory jig, with mounting brackets, tabs, and holes pre-installed. This ensures perfect alignment and strength. A technician cannot repair a cracked weld; the entire beam assembly must be replaced.

The Isolation Logic: This frame is the key to a quiet cab. It is bolted securely to the reinforced cab wall (using Core 3 bolts), and the berth (Core 1) is then bolted to *it*. This two-stage mounting, often using rubber isolators (not specified but implied), helps prevent road vibration from transferring directly to the sleeping surface.

Core 3: The “Frame Mounting” Logic (The Bolts)

This component is the set of high-strength fasteners used to secure the structural frame (Core 2) to the cab body.

1. Component: ‘Combination Bolt’ (CQ1460820F6) – Qty 16
This (Mark 5) is a set of 16 identical bolts. The part number CQ1460820F6 is slightly different from the seat bolts, indicating a different size or length (M8), but the logic is the same.

The High-Quantity Logic: 16 bolts are used to distribute the load of the FAW J6P Lower Berth across a wide area of the cab’s back wall. This prevents any single point from being over-stressed and prevents the frame from twisting or pulling away from the wall on rough roads.

The Combination Bolt Logic: As with other critical fasteners, these are ‘Combination Bolts’ (组合螺栓). Each bolt has a captive, pre-installed spring lock washer. This is essential for high-vibration areas, as it prevents the bolts from backing out over time, which would lead to a severe rattle or structural failure.

The Service Logic: When diagnosing a rattle in the FAW J6P Lower Berth, these 16 bolts are the first thing a technician should check. They must all be present and torqued to specification. A missing bolt can lead to a “popping” or “creaking” noise as the frame flexes against the cab wall.

Core 4: The “Occupant Retention” Logic (The Baffles)

This group represents the safety guards or baffles, which are critical for preventing the driver from falling out of the berth during sleep, especially if the truck is in motion or parked on an incline.

1. Component: ‘Left Berth Baffle Assy’ (7007045-A86) – Qty 1
This (Mark 6) is the safety baffle for the left side of the FAW J6P Lower Berth. It is an ‘Assy’, suggesting it may be upholstered or have multiple parts.

2. Component: ‘Right Berth Baffle Assy’ (7007050-A86) – Qty 1
This (Mark 7) is the corresponding baffle for the right side, ensuring full retention.

The Safety Logic: This is a simple but non-negotiable safety feature. These baffles act as a low-profile safety rail. They are designed to be high enough to prevent an occupant from rolling off the FAW J6P Lower Berth, but low enough not to interfere with entry and exit.

The “Assy” Logic: The ‘Assy’ designation implies these are not just simple metal bars. They are likely a steel core or frame, wrapped in foam, and then upholstered in the same matching textile as the main berth (Core 1). This makes them durable, safe (no hard edges), and aesthetically integrated.

The Service Logic: These baffles are often damaged when drivers use them as steps or handles. A bent or broken baffle must be replaced immediately, as it presents a significant safety hazard.

Core 5: The “Baffle Mounting” Logic (The Nuts)

This is the final set of hardware, specifically for attaching the safety baffles (Core 4) to the main berth assembly (Core 1) or its frame (Core 2).

1. Component: ‘Hex Nut’ (CQ34006) – Qty 2
This (Mark 8) is a pair of hex nuts. The low quantity (2) suggests they are for a very specific, high-load connection, or that the baffles are primarily held by other means and these are the final locking nuts.

The Securing Logic: These nuts (CQ34006) likely thread onto studs that protrude from the baffles or the berth frame. Given their critical safety role, these are almost certainly ‘Nyloc’ (nylon-insert) or ‘Stover’ (distorted thread) locknuts.

The Service Logic: If a baffle (Core 4) feels loose, these nuts are the primary suspects. A technician must check that they are present and properly torqued. If they are locknuts (as presumed), they should be replaced with new ones if ever removed, as their locking ability is compromised after one use. This ensures the FAW J6P Lower Berth baffles remain secure.

FAW J6P Lower Berth: Complete 9-Part Breakdown

The following table provides the complete, detailed breakdown of all 9 component types specified for the FAW J6P Lower Berth system on the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Lower Berth are defined by its role as an integrated comfort and structural system within the sleeper cab.