Stick: Length Range 2.5-8.5 meters

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

Parameter	Typical range	Notes & selection driver
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

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 10262, ISO 12100, DIN 15018, ISO 2867

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

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

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Stick

Manufacturer profiles associated with Stick.

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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 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.

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.

Stick