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Seal / Wiper Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

A dual-function sealing component installed on telescopic boom sections of heavy machinery (excavators, cranes, aerial lifts) that combines a wiper/scraper to remove external contaminants (dust, mud, debris) and a primary seal to retain hydraulic fluid within the cylinder, maintaining system integrity and preventing premature wear.

Working Principle

The wiper lip contacts the moving rod surface to scrape off contaminants during retraction, while the sealing lip maintains constant contact pressure to create a fluid-tight barrier against hydraulic pressure (typically 20-40 MPa), using elastomeric deformation and spring reinforcement to compensate for surface imperfections and thermal expansion.

Materials

Polyurethane (PU 95A-98A hardness) for abrasion resistance, Nitrile rubber (NBR 70-90 Shore A) for oil compatibility, or Fluorocarbon (FKM) for high-temperature applications; often includes stainless steel spring (AISI 304/316) or PTFE anti-extrusion rings.

Technical Parameters

Hardness 70-98 Shore A
Lip Design Double-lipped with scraper edge
Rod Diameter 50-200 mm
Pressure Rating Up to 40 MPa
Temperature Range -40°C to +120°C

Standards

ISO 6194, DIN 3760, SAE J515

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Seal / Wiper.

Parent Products

This component is used in the following industrial products

Boom Sections

Individual extendable segments that form the telescopic boom structure.

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Telescopic Sections (for telescopic booms)

Nested cylindrical or box-section components that extend and retract to adjust the length of a telescopic boom.

View Product Details

Engineering Analysis

Risks & Mitigation

Seal extrusion under high side-loads
Lip hardening from UV/ozone exposure
Contamination ingress due to worn wiper edge
Fluid incompatibility causing swelling/cracking

FMEA Triads

Trigger: Abrasive particles embedding in wiper lip
Failure: Scoring of rod surface leading to fluid leakage
Mitigation: Install external bellows or scraper rings in high-contamination environments

Trigger: Excessive heat from sustained high-pressure operation
Failure: Thermal degradation of elastomer reducing sealing force
Mitigation: Use high-temperature materials (FKM) and ensure adequate cooling

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.1 mm on sealing diameters per ISO 286-2

Test Method

ISO 7986 (hydraulic fluid leakage test) and ASTM D1414 (compression set resistance)

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

How often should boom section seals be replaced?

Typically every 2,000-5,000 operating hours or during cylinder overhaul, depending on contamination exposure and pressure cycles.

Can seals interchange between different boom manufacturers?

Only with identical dimensional specs (rod diameter, groove width) and material compatibility; always verify OEM cross-reference charts.

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.

Seal / Wiper