Main Arm Structure: Load Capacity 5,000-20,000 kg

Component Specifications

Definition

The Main Arm Structure is the central load-bearing framework of loader arms, engineered to withstand dynamic bending moments, torsional stresses, and compressive loads during material handling operations. It serves as the primary structural element connecting the boom cylinders to the attachment interface, ensuring force transmission from hydraulic actuators to the working tool while maintaining geometric stability under variable payload conditions.

Working Principle

Operates as a Class 1 lever system where hydraulic cylinders apply force at strategic pivot points, creating mechanical advantage to lift loads. The structure converts hydraulic pressure into rotational torque through pinned connections, with stress distributed along reinforced sections to prevent deformation. Load paths are optimized through geometric design to minimize stress concentrations.

Materials

High-strength low-alloy steel (HSLA Grade 80/100), yield strength 550-690 MPa, with corrosion-resistant coatings (zinc-rich epoxy primer + polyurethane topcoat). Critical sections may incorporate wear-resistant steel plates (Hardox 400/500) at pivot points.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	800-2,500 kg
Fatigue Life	≥500,000 cycles
Load Capacity	5,000-20,000 kg
Safety Factor	3:1 minimum
Working Pressure	25-35 MPa
Operating Temperature	-30°C to +50°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 13031, ISO 15818, DIN 15018, ISO 12100

Parent Products

This component is used in the following industrial products

Loader Arms

Structural components of a compact track loader that connect the attachment interface to the main chassis and provide lifting/lowering functionality.

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Engineering Analysis

Risks & Mitigation

Structural fatigue failure
Stress corrosion cracking
Weld joint degradation
Overload deformation
Pin and bushing wear

FMEA Triads

Trigger: Cyclic loading exceeding fatigue limits
Failure: Crack propagation in high-stress zones
Mitigation: Regular ultrasonic testing, design with smooth transitions, implement load monitoring systems

Trigger: Corrosive environment with inadequate protection
Failure: Reduced cross-sectional strength due to material loss
Mitigation: Enhanced coating systems, cathodic protection, regular corrosion inspection

Trigger: Improper maintenance of pivot connections
Failure: Increased clearance causing impact loads and misalignment
Mitigation: Scheduled lubrication, wear measurement protocols, bushing replacement schedules

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance ±2mm on critical interfaces, angular alignment within 0.5 degrees

Test Method

Static load testing to 150% rated capacity, fatigue testing per ISO 13031, non-destructive testing (UT/MT) of all welds

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Main Arm Structure

Manufacturer profiles associated with Main Arm Structure.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the typical maintenance interval for Main Arm Structures?

Visual inspection every 250 operating hours, with comprehensive structural inspection including NDT testing every 2,000 hours or annually. Pivot points require lubrication every 50 hours.

Can Main Arm Structures be repaired if cracked?

Limited repairs are possible following manufacturer specifications and certified welding procedures (typically AWS D1.1). Major structural cracks usually require component replacement to maintain safety certification.

How does material selection affect performance?

HSLA steel provides optimal strength-to-weight ratio, while wear-resistant steel at pivot points extends service life. Material grade directly impacts load capacity, fatigue resistance, and operational safety margins.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Main Arm Structure