Editorial Technical Reference

Swing Motor

This page explains how Swing Motor is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A hydraulic or electric motor that provides rotational power to drive the swing mechanism of heavy machinery.

Product Specifications

Technical details and manufacturing context for Swing Motor

Definition
The swing motor is a critical component of the swing mechanism in construction and mining equipment, responsible for converting hydraulic pressure or electrical energy into controlled rotational motion. It enables the upper structure of machinery like excavators, cranes, and drilling rigs to rotate horizontally relative to the undercarriage, allowing precise positioning and material handling operations. In hydraulic systems, pressurized fluid from the main pump enters the motor, causing pistons or gears to rotate a shaft. In electric systems, electromagnetic forces create rotational torque. The motor's output shaft connects to a reduction gearbox that drives the swing bearing, enabling smooth, controlled rotation with variable speed and torque capabilities. This component is typically manufactured from high-strength alloy steel, with bronze bushings and specialized seal materials to ensure durability and leak-free operation. Key parameters include displacement (25–100 cm³/rev), operating pressure (20–35 MPa), max torque (1000–5000 N·m), speed range (0–100 rpm), volumetric efficiency (≥92%), operating temperature (-20–80 °C), max inlet pressure (40 MPa), max return pressure (2.5 MPa), weight (50–200 kg), shaft diameter (30–60 mm), mounting flange (SAE A–D per SAE J744), and port size (G1/2–G1 1/4 per ISO 228-1). These values are reference ranges and must be verified for the specific model and application. The swing motor is selected based on required torque, speed, and mounting interface. It is essential to confirm compatibility with the hydraulic or electrical system, as well as adherence to relevant standards. Regular maintenance includes checking seals, monitoring operating temperature, and ensuring proper fluid cleanliness. Failure modes include seal wear, bearing damage, and internal leakage, which manifest as reduced efficiency or erratic rotation. Always consult the manufacturer for model-specific specifications and verification procedures.
Working Principle
In hydraulic systems, pressurized fluid from the main pump enters the motor, causing pistons or gears to rotate a shaft. In electric systems, electromagnetic forces create rotational torque. The motor's output shaft connects to a reduction gearbox that drives the swing bearing, enabling smooth, controlled rotation with variable speed and torque capabilities.
Common Materials
High-strength alloy steel, Bronze bushings, Seal materials
Technical Parameters
ParameterTypical rangeNotes & selection driver
Displacement25–100 cm³/revDetermines speed and torque output
Operating Pressure20–35 MPaMax pressure rating for continuous operation
Max Torque1000–5000 N·mPeak torque at max pressure
Speed Range0–100 rpmTypical operating speed range
Volumetric Efficiency≥92 %At rated pressure and speed
Operating Temperature-20–80 °CHydraulic fluid temperature range
Max Inlet Pressure40 MPaPeak pressure without damage
Max Return Pressure2.5 MPaContinuous back pressure limit
Weight50–200 kgDepends on displacement and design
Shaft Diameter30–60 mmSpline or keyed shaft dimensions
Mounting FlangeSAE A–DStandard mounting interfaceSAE J744
Port SizeG1/2–G1 1/4Threaded ports for hydraulic linesISO 228-1

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

Components / BOM
  • Motor Housing Part
    Contains and protects internal components, provides mounting points
    Material: Cast iron or aluminum alloy
  • Shaft Part
    Transmits rotational torque to the gearbox
    Material: Hardened alloy steel
  • Pistons/Cylinders Part
    Convert hydraulic pressure into mechanical force
    Material: Hardened steel with ceramic coatings
  • Valve Plate Part
    Controls fluid flow direction to pistons
    Material: Hardened steel with precision grinding

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Swing Motor.

Applied To / Applications

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

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 350 bar (hydraulic), 600V max (electric)
flow rate: 5-500 L/min (hydraulic), 10-1000 A (electric)
temperature: -40°C to 120°C
slurry concentration: Not applicable - designed for clean hydraulic fluids or electric operation
Media Compatibility
✓ Hydraulic oil ISO VG 46 ✓ Synthetic hydraulic fluids ✓ Clean industrial environments
Unsuitable: Saltwater/marine environments without special sealing
Sizing Data Required
  • Required torque (Nm)
  • Swing speed (RPM)
  • Operating duty cycle (%)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing fatigue and seizure
Cause: Inadequate lubrication, contamination ingress, or excessive axial/radial loads leading to overheating and premature wear.
Shaft seal leakage
Cause: Wear from abrasive particles, improper installation, or thermal degradation causing hydraulic fluid loss and contamination.
Maintenance Indicators
  • Unusual grinding or whining noise during operation indicating bearing or gear wear
  • Visible hydraulic fluid leaks around shaft seals or housing joints
Engineering Tips
  • Implement condition-based lubrication with filtered oil and regular oil analysis to monitor contamination levels
  • Install protective covers and maintain clean operating environment to prevent abrasive particle ingress into critical components

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 4401:2005 (Hydraulic fluid power - Four-port directional control valves - Mounting surfaces) ANSI/B93.5M-1985 (Hydraulic Fluid Power - Motors - Methods of Testing) DIN 24340 (Hydraulic fluid power - Motors - Dimensions and mounting flanges)

Quoted from the published standard.

Manufacturing Precision
  • Shaft runout: ≤0.05mm
  • Port flatness: 0.025mm per 100mm
Quality Inspection
  • Pressure cycling endurance test (ISO 10767-1)
  • Leakage test (internal and external) at rated pressure

Manufacturers of Swing Motor

5 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Hangzhou XC Machinery Co,.ltd.
Hangzhou, Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “swing motor”
View source page ↗ xcgparts.com · checked 2026-09-06
Quanzhou Bole Automation Engineering Co., Ltd.
Fujian, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Swing motor test”
View source page ↗ hboeth.com · checked 2026-08-31
TM Hydraulic Co., Ltd.
Jiangsu, CN
Also makes: Slewing Bearing, Hydraulic Pump, Control Valve and 2 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Swing Motor Series”
View source page ↗ tmhydraulic.com · checked 2026-09-14
WEITAI Group
Qingdao, Shandong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Swing Motor”
View source page ↗ weitai-group.com · checked 2026-09-14
Yantai Chicheng Hydraulic Machinery Co., Ltd.
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Swing Motor”
View source page ↗ chichenghydraulic.com · checked 2026-09-02

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the function of a swing motor?

The swing motor converts hydraulic pressure or electrical energy into rotational motion to rotate the upper structure of heavy machinery, such as excavators, cranes, and drilling rigs, relative to the undercarriage. This enables precise positioning and material handling.

What are the typical parameters for a swing motor?

Typical reference ranges include displacement of 25–100 cm³/rev, operating pressure of 20–35 MPa, max torque of 1000–5000 N·m, speed range of 0–100 rpm, and volumetric efficiency of at least 92%. These values must be confirmed for the specific model and application.

How do I select the right swing motor?

Selection depends on required torque, speed, and mounting interface. Consider the hydraulic or electrical system compatibility, operating pressure, and port sizes. Always verify with the manufacturer for model-specific specifications and standards.

What maintenance does a swing motor require?

Regular maintenance includes checking seals for leaks, monitoring operating temperature, ensuring proper fluid cleanliness, and inspecting for unusual noise or vibration. Failure signs include reduced efficiency, erratic rotation, or overheating. Consult the manufacturer for service intervals.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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