INDUSTRY COMPONENT

Stick

The stick is a critical structural component in crawler excavators that connects the boom to the bucket, enabling precise digging and material handling operations.

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Component Specifications

Definition
The stick (also known as the dipper arm or crowd arm) is a primary structural member in crawler excavator kinematics, positioned between the boom and bucket. It functions as a lever arm that transmits hydraulic force from the stick cylinder to control bucket penetration depth, digging trajectory, and material handling precision. This component experiences complex dynamic loading including bending moments, torsion, and cyclic fatigue during excavation cycles.
Working Principle
The stick operates on lever mechanics and hydraulic actuation principles. Hydraulic pressure from the stick cylinder creates rotational force around the boom-stick pivot point, enabling controlled extension and retraction movements. This mechanical advantage allows precise control of bucket position relative to the machine's center of gravity, optimizing digging force and material handling efficiency.
Materials
High-strength low-alloy steel (HSLA) ASTM A572 Grade 50 or equivalent, with yield strength ≥345 MPa, tensile strength ≥450 MPa, and Charpy V-notch impact toughness ≥27J at -20°C. Critical sections may utilize quenched and tempered steel for enhanced fatigue resistance.
Technical Parameters
  • Design Life ≥15,000 operating hours
  • Length Range 2.5-8.5 meters
  • Weight Capacity 15-45 tons depending on excavator class
  • Surface Treatment Shot peening + epoxy primer + polyurethane topcoat
  • Hydraulic Pressure 30-35 MPa operating pressure
  • Pivot Bearing Type Tapered roller bearings or bronze bushings
Standards
ISO 10262, ISO 12100, DIN 15018, ISO 2867

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Stick.

excavator stick dipper arm crowd arm heavy equipment components hydraulic excavator parts digging attachment construction machinery Stick Stick in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Crawler Excavator

A heavy construction machine with a tracked undercarriage, used for digging, trenching, and material handling.

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Engineering Analysis

Risks & Mitigation
  • Structural fatigue failure
  • Bearing seizure due to contamination
  • Hydraulic system overpressure
  • Corrosion in aggressive environments
  • Improper welding repairs compromising integrity
FMEA Triads
Trigger: Cyclic loading exceeding material endurance limit
Failure: Fatigue crack propagation leading to structural fracture
Mitigation: Implement regular NDT inspections, maintain proper lubrication, avoid shock loading, and use strain gauges for load monitoring
Trigger: Contaminated hydraulic fluid
Failure: Stick cylinder seal degradation and pressure loss
Mitigation: Maintain fluid cleanliness to ISO 4406 18/16/13 standards, install filtration systems, and perform regular fluid analysis
Trigger: Improper bucket loading techniques
Failure: Premature wear at pivot points and structural deformation
Mitigation: Operator training on proper digging techniques, implement load monitoring systems, and avoid side loading

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±2mm on critical pivot bore diameters, ±3mm on overall length, surface flatness within 1.5mm/m
Test Method
Ultrasonic testing per ISO 17640, magnetic particle inspection per ISO 9934, load testing to 150% of rated capacity, finite element analysis validation

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of an excavator stick?

The stick controls bucket penetration depth and digging trajectory by transmitting hydraulic force from the stick cylinder, enabling precise material excavation and handling.

How often should stick components be inspected?

Perform visual inspections daily for cracks or deformation, detailed NDT inspections every 500 operating hours, and comprehensive structural analysis annually or after 2,000 hours.

What are common failure modes for excavator sticks?

Fatigue cracking at stress concentration points, bearing wear at pivot joints, hydraulic cylinder mounting failure, and corrosion in harsh environments.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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