Hydraulic Support System Cab: Deconstructing 15 Critical Parts for Flawless Tilting

This is a comprehensive technical guide to the Hydraulic Support System Cab assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This deconstruction analyzes the 15 serviceable component types that form the complete hydraulic tilting and locking mechanism for the cab.

The Hydraulic Support System Cab is an indispensable safety and maintenance component. Its primary function is to facilitate the controlled forward tilting of the heavy cab structure, providing engine access for service and repair. The system operates on a hydraulic pump (not shown here) that drives a large-capacity cylinder (Comp 1) for lifting and lowering. This controlled movement is paramount, as an uncontrolled tilt could result in catastrophic failure or serious injury.

This deconstruction will analyze the key components of the Hydraulic Support System Cab, focusing on the hydraulic cylinder, the upper and lower mounting brackets, and the critical locking hardware. The robust nature of the fasteners and mounting points defines the safety margin of the entire Hydraulic Support System Cab when the truck is being driven, ensuring the heavy cab remains securely locked in place against all road forces. Every part is essential for the reliable and safe operation of the Hydraulic Support System Cab.

Core 1: The “Lifting” Logic (The Hydraulic Cylinder)

This group contains the core lifting mechanisms of the Hydraulic Support System Cab. The main cylinder handles the entire static and dynamic load during tilting.

1. Component: ‘Cab tilting hydraulic cylinder assy’ (5002015-B35J) – Qty 1
This (Comp 1) is the large hydraulic ram. The Hydraulic Tilting Logic is simple: pressurized fluid extends this cylinder, forcing the cab to pivot. The internal safety valves within this cylinder are designed to prevent the cab from free-falling in case of a hose burst. This is the defining component of the Hydraulic Support System Cab.

2. Component: ‘Upper bracket – hydraulic cylinder’ (5002016-B35J) – Qty 1
This (Comp 2) is the bracket welded or bolted to the cab structure itself. It anchors the top of the hydraulic cylinder (Comp 1). This bracket experiences immense tensile force when the cab is lifted and is a critical structural element of the Hydraulic Support System Cab.

3. Component: ‘Hydraulic cylinder lower fixed bracket assy’ (5002020-90C) – Qty 1
This (Comp 7) is the heavy-duty mounting bracket that bolts to the chassis frame rail. This bracket anchors the bottom of the cylinder, translating the cylinder’s force into the pivoting action. This lower anchor point of the Hydraulic Support System Cab must be extremely rigid.

Core 2: The “Pivotal Linkage” Logic (Pins, Pads, and Stops)

This group includes the pins and protective pads that allow the Hydraulic Support System Cab to articulate and safely rest on the frame.

1. Component: ‘Flat head pin’ (Q5101480) & ‘Cotter pin’ (Q5006020) – Qty 1 each
This (Comp 3, 5) is the main securing hardware for the cylinder’s mounting points. The ‘Flat head pin’ acts as a clevis pin for articulation. The Safety Pin Logic is that the ‘Cotter pin’ (Comp 5) locks the main pin (Comp 3) in place, providing a redundant safety mechanism to prevent the cylinder from detaching during operation. This is critical for the Hydraulic Support System Cab.

2. Component: ‘Soft pad – hydraulic cylinder lower fixed point’ (5002027-A01) – Qty 2
This (Comp 14) is a crucial isolation component. This high-density rubber pad is installed at the cylinder’s lower mounting point. The Isolation Logic ensures that the constant vibration from the engine and chassis is not directly transmitted to the hydraulic cylinder casing, which would cause fatigue and premature failure. It provides a soft, secure rest point for the Hydraulic Support System Cab.

3. Component: ‘Large washer’ (Q40218) – Qty 3
This (Comp 4, 15) is a plain washer. It is used in conjunction with the pins and bolts to distribute the heavy clamping forces across the mounting brackets. It is critical for the stability of the Hydraulic Support System Cab.

Core 3: The “Retention” Logic (Bolts & Locknuts)

This group includes the high-strength locking hardware essential for maintaining the integrity and safety of the Hydraulic Support System Cab against road shock and vibration.

1. Component: ‘Hex flange lock nut’ (CQ32614, CQ32616) – Qty 1 and 1
This (Comp 8, 11) is the high-strength locking hardware. The Self-Locking Logic is paramount: these nuts contain a mechanical feature (a flange or a deformed thread) that prevents them from vibrating loose. This is essential for all primary connection points of the Hydraulic Support System Cab.

2. Component: ‘Hex flange bolt’ (Q1841445, Q1841650, Q1841240) – Qty 1, 1, and 2
This (Comp 9, 10, 12) is the range of high-tensile bolts used to secure the fixed bracket (Comp 7) to the chassis. These bolts must withstand the full load of the cab during severe braking or cornering. The strength of these bolts is critical for the Hydraulic Support System Cab.

3. Component: ‘Combination bolt’ (CQ1461240) – Qty 2
This (Comp 6) is a specialized bolt with a pre-attached washer. It is often used for securing structural components where the clamping force needs to be distributed evenly across the metal surface. The Hydraulic Support System Cab utilizes this hardware for ease of assembly and reliability.

4. Component: ‘Hex flange nut’ (CQ39616) & ‘Non-metallic insert hex lock nut’ (CQ32918) – Qty 2 and 1
This (Comp 13, 16) is the final layer of redundant securing hardware. These nuts ensure that the pivotal joints and mounting points of the Hydraulic Support System Cab cannot fail. The non-metallic insert nut (Comp 16) provides an anti-vibration grip that is highly valued in heavy truck applications.

Hydraulic Support System Cab: Complete 15-Part Breakdown

The following table provides the complete, detailed breakdown of all 15 component types in the Hydraulic Support System Cab assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This list is essential for ordering spare parts and performing a complete service of the Hydraulic Support System Cab.

Core Specifications

The specifications for the Hydraulic Support System Cab are defined by its function as a high-strength, dampening mount for the front of the tilt-cab. This assembly is crucial for vertical shock isolation.