GS20D25F Swing Motor
3 week ago
Product details
1. Model Definition
GS20D25F Swing Motor belongs to SANY GS series integrated swing drive assembly for excavators, mainly matched with medium excavators of 20–35 tons. It adopts an integrated structure combining hydraulic motor and planetary reduction housing:
- GS: Series code for SANY swing reducer
- 20: Frame size, designed for 20-ton class machine platform
- D: Vertical flange mounting structure
- 25: Nominal reduction ratio of 25.09
- F: Equipped with integrated wet normally closed brake valve
The whole unit is categorized as a core FINAL DRIVE (terminal final drive unit) for construction machinery. Different from travel drive, it is specially used for upper structure slewing movement.
2. Overall Assembly Definition
Supplied as a complete Travel Assembly with rigid assembly of Swing Motor main body and SWING REDUCER planetary reduction housing, forming the exclusive swing FINAL DRIVE power assembly for excavator upper carriage. It can be directly installed and replaced without separate component assembly.
1. Swing Motor: Hydraulic power input component, axial piston hydraulic motor that converts hydraulic pressure into high-speed rotation power
2. SWING REDUCER: Planetary swing reducer with multi-stage planetary gear reduction mechanism, responsible for reducing rotational speed and amplifying output torque, serving as the main load-bearing part
3. FINAL DRIVE: General term for the entire swing terminal transmission system (integrated assembly of motor and reducer), named by referencing the crawler travel final drive
4. Travel Assembly: Foreign trade spare part term referring to the fully integrated set including motor, reducer, brake assembly, seal kit, output flange and all accessories
3. Core Technical Parameters
Item Specification of GS20D25F
Assembly Type Swing FINAL DRIVE (one-piece Travel Assembly combining Swing Motor & SWING REDUCER)
Reduction Ratio 25.09
Rated Output Torque 9800 N·m
Brake Type Built-in multi-plate wet parking brake, braking torque: 1450 N·m
Working Pressure Rated system pressure: 28MPa, peak pressure: 34MPa
Compatible Host SANY SY305/SY335, XCMG XE305, LISHIDE SC330 and other 30-ton class excavators
Total Assembly Weight 168kg
Structure Layout 3-stage NGW planetary gear SWING REDUCER directly coupled with axial piston Swing Motor
Output Form Splined output flange connected to slewing bearing
4. Structural Breakdown & Function Introduction
4.1 Upper Section: Swing Motor
Adopts axial piston hydraulic motor structure with integrated relief valve, charge valve and cushion valve block to buffer startup and shutdown impacts and avoid sudden swing of the upper structure.
It is equipped with a hydraulically released normally closed brake, which locks the slewing platform under oil pressure relief to prevent slipping on slope operation.
As the power input end of the FINAL DRIVE, it delivers a maximum input speed of 2200rpm to the SWING REDUCER.
4.2 Lower Section: SWING REDUCER
Core reduction component of GS20D25F, configured with 3-series tandem planetary gears: power transmits through sun gear, planet carrier and internal ring gear for progressive deceleration.
All gears are made of alloy steel via carburizing and quenching treatment (hardness HRC58–62) for heavy-load and impact-resistant performance.
The integral cast steel housing withstands harsh working conditions such as gravel and earthwork impacts. As the load-bearing core of the whole Travel Assembly, it finally outputs high torque to drive the large slewing gear and realize 360° rotation of the upper carriage.
4.3 Full Accessory List of Travel Assembly
Complete package includes Swing Motor main unit, SWING REDUCER reduction housing assembly, full set of planetary gear components, output flange, full oil seals, bearing set, brake friction plates, pipe fittings and sealing gaskets, providing one-stop replacement spare parts for FINAL DRIVE.
5. Application & Product Advantages
1. Working Condition Adaptability: Excellent durability in earthmoving, frequent breaker operation, heavy mining excavation and frequent forward/reverse rotation startup & stop scenarios
2. Modular Design: Standardized Travel Assembly design, highly interchangeable for imported swing FINAL DRIVE like M5X180 series for direct replacement
3. Durable Construction: High-precision ground gears inside SWING REDUCER with forced oil bath lubrication, featuring low temperature rise and low noise, with overall service life over 8000 working hours
4. Foreign Trade Selection Full Designation: GS20D25F Swing Motor Complete Travel Assembly (Swing Reducer Integrated Final Drive)
6. Concept Distinction
- Travel FINAL DRIVE: Drives crawler movement (composed of travel motor + travel reducer)
- GS20D25F Model: Swing FINAL DRIVE for upper structure rotation, assembled by Swing Motor and SWING REDUCER into a full Travel Assembly, not interchangeable with travel final drive.
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
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4 year
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