---
title: "Undercarriage"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:UNDERCARRIAGE"
  data_integrity_hash: "ddda845531f004b1715bf826f41382ec"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:UNDERCARRIAGE"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/undercarriage.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/undercarriage"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "Ground pressure: 40-80 kPa, Track tension: 150-300 kN, Crawler speed: 0-5.5 km/h"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 450
    unit: "MPa"
    consequence: "Hertzian contact fatigue in roller bearings due to cyclic loading exceeding 2×10⁶ cycles, Stress corrosion cracking in high-strength steel components from chloride ion exposure at concentrations &gt;50 ppm"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Improper track tension adjustment causing misalignment"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Automatic track tension monitoring system with laser alignment sensors and hydraulic feedback control"
  - node_2:
      trigger: "Inadequate lubrication film thickness in roller bearings (&lt;1 μm)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Forced lubrication system with 0.1 μm filtration and viscosity monitoring at 40°C reference temperature"
bom_nodes:
  track-frame:
    type: "part"
    urn: "URN:CNFX:ME:TRACK_FRAME"
    interface_type: "physical-logic-coupled"
  track-rollers:
    type: "component"
    urn: "URN:CNFX:ME:TRACK_ROLLERS"
    interface_type: "physical-logic-coupled"
  idlers:
    type: "component"
    urn: "URN:CNFX:ME:IDLERS"
    interface_type: "physical-logic-coupled"
  sprockets:
    type: "component"
    urn: "URN:CNFX:ME:SPROCKETS"
    interface_type: "physical-logic-coupled"
  track-shoes:
    type: "component"
    urn: "URN:CNFX:ME:TRACK_SHOES"
    interface_type: "physical-logic-coupled"
  track-chain:
    type: "part"
    urn: "URN:CNFX:ME:TRACK_CHAIN"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-2:2010 (LIMITS AND FITS)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI B4.1-1967 (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/undercarriage.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "8903fe120e268e8e9dd56a7506c3425f87fb24c0abd3b7e3947f8b8e20a26da5"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Undercarriage

## 1. Technical Definition
The structural base assembly of a hydraulic excavator that supports the upper structure and provides mobility.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **Ground pressure: 40-80 kPa, Track tension: 150-300 kN, Crawler speed: 0-5.5 km/h**. Failure boundary: **Track link pin shear stress exceeds 450 MPa, Roller bearing temperature exceeds 120°C, Frame weld stress exceeds yield strength of 355 MPa steel**, Mechanism: **Hertzian contact fatigue in roller bearings due to cyclic loading exceeding 2×10⁶ cycles, Stress corrosion cracking in high-strength steel components from chloride ion exposure at concentrations &gt;50 ppm**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Improper track tension adjustment causing misalignment | 8 | Accelerated sprocket tooth wear exceeding 0.5 mm/1000 operating hours | Automatic track tension monitoring system with laser alignment sensors and hydraulic feedback control |
| Inadequate lubrication film thickness in roller bearings (&lt;1 μm) | 8 | Metal-to-metal contact leading to bearing seizure within 200 operating hours | Forced lubrication system with 0.1 μm filtration and viscosity monitoring at 40°C reference temperature |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Track Frame](https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/track-frame.md) `(Standalone System)`
- [Track Chain](https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/track-chain.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**, **Track Tensioning System**, **Track Pad Installation Press**  
**Downstream Applications**: Hydraulic Excavator, Track-Type Tractor, Crawler Crane  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are used in manufacturing undercarriage components?
**A**: Our undercarriage is constructed from high-strength steel and alloy steel for structural parts, with rubber elements in track shoes for durability and traction.

### Q: How does the undercarriage support hydraulic excavator performance?
**A**: The undercarriage provides the structural base that supports the upper structure, distributes weight evenly, and enables smooth mobility through its track system components.

### Q: What maintenance is required for undercarriage components?
**A**: Regular inspection of track rollers, idlers, sprockets, and track chain for wear, along with proper tension adjustment and cleaning, ensures optimal performance and longevity.

## 6. Manufacturing Compliance
- ISO 286-2:2010 (LIMITS AND FITS)
- ANSI B4.1-1967 (PREFERRED LIMITS AND FITS FOR CYLINDRICAL PARTS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Undercarriage](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/undercarriage)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **6** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: UNDERCARRIAGE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 42cee165
