Industry-Verified Manufacturing Data (2026)

Upper Structure (House)

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Upper Structure (House) used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Upper Structure (House) is characterized by the integration of Operator's Cab and Engine Mounting Frame. In industrial production environments, manufacturers listed on CNFX commonly emphasize High-strength steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The rotating platform of a hydraulic excavator that houses the operator's cab, engine, hydraulic pumps, and other key components.

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Product Specifications

Technical details and manufacturing context for Upper Structure (House)

Definition
The upper structure, also known as the house or revolving frame, is the rotating component of a hydraulic excavator mounted on the undercarriage. It contains the operator's cab with controls, the engine and power system, hydraulic pumps and tanks, counterweight, and all major working components. This structure rotates 360 degrees on the swing bearing, allowing the excavator to dig and dump material without moving the tracks.
Working Principle
The upper structure rotates on a swing bearing mounted to the undercarriage, powered by a hydraulic swing motor. This rotation enables the excavator arm and attachment to reach different positions while the machine remains stationary. The structure houses and protects all critical systems while providing a stable platform for excavation operations.
Common Materials
High-strength steel, Structural steel plate
Technical Parameters
  • Overall dimensions including length, width, and height of the upper structure (mm) Standard Spec
Components / BOM
  • Operator's Cab
    Enclosed compartment for the operator with controls, seat, and safety features
    Material: Steel and safety glass
  • Engine Mounting Frame
    Structural frame that supports and secures the engine and power system
    Material: Structural steel
  • Hydraulic Pump Mounting Plate
    Platform for mounting hydraulic pumps and associated components
    Material: Steel plate
  • Counterweight Mounting Structure
    Reinforced area for attaching counterweight to balance digging forces
    Material: High-strength steel
  • Swing Bearing Mounting Ring
    Circular mounting surface for the swing bearing that connects to undercarriage
    Material: Machined steel
Engineering Reasoning
0-360 degrees continuous rotation at 0-12 rpm, structural load capacity 15-45 kN·m bending moment
Structural failure occurs at 55 kN·m bending moment or 0.5 mm permanent deformation at bearing raceways
Design Rationale: Bending fatigue failure due to cyclic loading exceeding material yield strength (S355 steel, 355 MPa yield)
Risk Mitigation (FMEA)
Trigger Bearing raceway pitting from contaminated lubricant (ISO 4406 code >18/16/13)
Mode: Increased rotational resistance exceeding 120 N·m torque at 5 rpm
Strategy: Sealed-for-life tapered roller bearings with IP67 protection and automated grease monitoring
Trigger Structural resonance at 8-12 Hz matching engine vibration frequency
Mode: Accelerated crack propagation at weld joints exceeding 2 mm/year growth rate
Strategy: Finite element analysis-optimized ribbing pattern and tuned mass dampers at 10 Hz natural frequency

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Upper Structure (House).

hydraulic excavator upper structure excavator rotating platform steel heavy equipment cab mounting frame excavator swing bearing mounting ring industrial machinery counterweight structure

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Hydraulic Excavator
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Hydraulic system: 350 bar max, structural: 1.5x design load safety factor
other spec: Rotation speed: 0-12 RPM continuous, 15 RPM peak, Flow rate: 100-400 L/min hydraulic system, Vibration: ISO 2631-1 compliant for operator comfort
temperature: -20°C to +50°C (operational), -40°C to +70°C (storage)
Media Compatibility
✓ Construction sites (earth/rock) ✓ Mining operations (ore handling) ✓ Demolition environments (concrete debris)
Unsuitable: Marine/saltwater immersion (corrosive chloride environment)
Sizing Data Required
  • Machine weight class (tons)
  • Required hydraulic system power (kW/HP)
  • Cab configuration and auxiliary equipment load (kg)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Structural fatigue cracking
Cause: Cyclic loading from wind, seismic activity, or operational vibrations exceeding design limits, leading to stress concentration at joints or material defects.
Corrosion-induced degradation
Cause: Exposure to moisture, chemicals, or atmospheric pollutants causing material loss, weakening structural integrity, especially at connections or unprotected surfaces.
Maintenance Indicators
  • Visible cracks, deformation, or excessive deflection in beams, columns, or connections
  • Unusual creaking, popping, or rattling noises during wind events or operational loads
Engineering Tips
  • Implement regular non-destructive testing (e.g., ultrasonic, magnetic particle) at high-stress areas to detect early fatigue or corrosion before failure
  • Apply protective coatings and ensure proper drainage to prevent water accumulation, and install vibration dampers to reduce cyclic stress on connections

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 Quality Management Systems ASTM E119 Standard Test Methods for Fire Tests of Building Construction and Materials CE Marking for Construction Products Regulation (EU) No 305/2011
Manufacturing Precision
  • Vertical Alignment: +/- 5mm per 3m height
  • Joint Gaps: +/- 2mm for prefabricated components
Quality Inspection
  • Non-Destructive Testing (NDT) for structural welds
  • Load Testing of structural elements to verify design capacity

Factories Producing Upper Structure (House)

Verified manufacturers with capability to produce this product in China

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✓ 92% Supplier Capability Match Found

P Procurement Specialist from United States Feb 04, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
T Technical Director from United Arab Emirates Feb 01, 2026
★★★★★
"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Upper Structure (House) meets all ISO standards."
Technical Specifications Verified
P Project Engineer from Australia Jan 29, 2026
★★★★★
"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Upper Structure (House) arrived with full certification."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

6 sourcing managers are analyzing this specification now. Last inquiry for Upper Structure (House) from Brazil (1h ago).

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Frequently Asked Questions

What materials are used in the upper structure construction?

The upper structure is fabricated from high-strength steel and structural steel plate, ensuring durability and load-bearing capacity for heavy machinery applications.

What components does the excavator upper structure house?

It houses the operator's cab, engine, hydraulic pumps, swing bearing mounting ring, counterweight mounting structure, and all associated mounting frames and plates.

How does the upper structure contribute to excavator performance?

The rotating platform provides stable mounting for critical components, enabling smooth 360-degree rotation while maintaining structural integrity under heavy operational loads.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Machinery and Equipment Manufacturing sector.

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