Product Specification
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| Payment Terms |
T/T,Western Union |
Delivery Time |
In Stock |
| Supply Ability |
1-10000pcs |
Packaging Details |
Wooden Case Packaging |
| Model Number |
14221709 |
Place of Origin |
Japan and China |
| Brand Name |
Sany |
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Detailed Product Specification for Sany Genuine Swing Reducer Assembly GS20D25C.0
I. Basic Material Information
Schematic Diagram for Swing Reducer Installation
Full Product Name: Sany Swing Reducer Assembly (Integrated Brake + Two-Stage Planetary Structure)
Model No.: GS20D25C.0, Matched with Kawasaki M5X180 Motor Made in Japan
Sany Original Material Code: 14221709
Brand Affiliation: Original Matching Component of SANY SOOT Transmission
Supply Status: In Stock, Packed in Wooden Case Packaging, US Dollar Price Negotiable
Applicable Excavator Models:
Sany Medium Heavy-Duty Excavators: SY305H, SY335H, SY365H, SY375H
II. Core Function Description
The swing reducer is the core transmission component of the upper-car swing system for excavators. It receives input power from the swing motor, reduces motor speed and amplifies output torque via a two-stage planetary gear reduction mechanism to drive the cab and counterweight to swing left and right as a whole. Equipped with an integrated parking brake, it locks the swing platform when the machine stops, preventing sliding on slopes and shaking during operation.
III. Overall Structure & Material Hierarchy
1. Overall Structural Composition (From Top to Bottom)
Swing Motor Mounting Flange → Brake Assembly → Two-Stage Planetary Reduction Mechanism → Output Gear Shaft → Housing Assembly → Oil Drain / Oil Fitting Assembly → Multi-lip Oil Seal Assembly
2. Material & Processing Technology for Key Components
- Sun Gear, Planet Gears, Internal Gear Ring: Made of 20CrMnTi alloy steel, treated with carburizing quenching and precision gear grinding. Tooth surface hardness reaches HRC58~62. Featuring excellent impact resistance, pitting resistance, wear resistance and compression resistance, it is suitable for heavy-load impact working conditions in mines.
- Planet Carrier & Output Shaft: Made of 40Cr steel with quenching and tempering plus precision finishing, featuring high bending and torsion resistance to avoid distortion under heavy loads.
- Reducer Housing: Integrally cast from high-strength ductile iron with high rigidity, shock absorption and deformation resistance, resistant to collision and hydraulic impact.
- Parking Brake Friction Plates: Multi-piece copper-based powder metallurgy friction plates. Adopting normally closed spring brake and hydraulically released design, it delivers stable braking performance, high temperature resistance and even wear.
- Sealing System: Imported fluororubber shaft oil seals + O-rings + labyrinth dust-proof structure, resistant to hydraulic oil corrosion and high temperature, effectively preventing oil leakage, water and mud ingress.
- Main Support Bearings: Paired heavy-duty tapered roller bearings capable of bearing axial force, radial force and overturning moment generated during operation simultaneously.
IV. Precise Technical Parameters
Transmission Structure: Two-stage Planetary Reduction (D = Double Stage)
Nominal Reduction Ratio: 25.2
Rated Output Torque: 18800 N·m
Parking Brake Torque: 967 N·m
Net Weight of Assembly: 425 kg
Overall Mounting Dimension: 528mm × 935mm
Matching Input: Directly mounted with original Sany swing plunger motor with fully matched original interfaces
Transmission Efficiency: 91%~94% under full load condition, low transmission loss and responsive swing action
Applicable Oil Temperature Range: -25℃ ~ +95℃, adaptable to open-air construction in hot summer and cold winter
Protection Class: IP65, dust-proof and mud-water intrusion-proof
V. Core Product Advantages
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Original Perfect Matching
Exclusive Sany part code 14221709; mounting hole positions, spline dimensions and flange dimensions are 100% compatible with SY305/SY335/SY365/SY375. Direct replacement installation without hole modification, with strong interchangeability.
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Reinforced Design for Heavy Loads
Optimized for frequent swing start-stop operations in earthwork, mining and heavy loading scenarios. Increased gear load margin prevents gear tooth breakage and shaft fracture, extending overall service life.
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Stable Braking Performance
Normally closed spring brake structure locks swing instantly after shutdown, avoiding sliding on slopes and shock or jitter during swing start and stop for smooth manipulation.
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Long-Lasting Anti-Leak Sealing Design
Three-layer oil seal protection eliminates common oil leakage defects at shaft end and housing joint of old-version reducers, lowering maintenance frequency.
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Easy Maintenance
Pre-reserved oil filling port, oil drain port and oil level sight window on housing for simple filling, inspection and replacement of gear oil.
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Modular Assembly Design
Available for whole-unit replacement; planetary gears, brake unit, oil seals and other wearing parts can be disassembled and repaired separately to control maintenance costs.
VI. Key Points for Installation & Replacement
- Release residual hydraulic pressure of swing system before disassembly to prevent personal injury caused by high-pressure oil injection.
- Remove central pipeline of swing bearing, motor fixing bolts and reducer mounting bolts, then lift out the old reducer as a whole.
- Clean grease and iron filings on the mating surface of swing bearing before installation, fit brand-new gaskets, fasten bolts diagonally in multiple times in accordance with original factory torque specifications.
- After assembly, fill dedicated construction machinery planetary gear oil to specified level. Conduct 30-minute no-load forward and reverse swing running-in, and check for abnormal noise and oil leakage.
- Test swing speed, smoothness of start & stop and brake locking effect during trial run. The product is qualified if no shaking, abnormal noise or oil leakage occurs.
VII. Common Faults, Causes & Consequences
Abnormal Swing Noise & Periodic Gear Meshing Noise
Causes: Gear wear, insufficient lubrication, metal impurities entering the housing, bearing damage.
Consequence: Long-term faulty operation may crack gear ring and scrap the entire reducer assembly.
Weak Swing, Low Rotating Speed & Pressure Build-up
Causes: Excessive internal gear clearance, dragging brake with poor oil return, worn planet carrier pin shafts.
Consequence: Reduced operation efficiency and difficulty in swing movement during climbing.
Oil Leakage at Shaft End / Housing
Causes: Aging oil seals, loose housing bolts, blocked vent hole, overfilled gear oil.
Consequence: Insufficient oil will rapidly abrade gears and bearings, leading to complete seizure.
Swing Creepage & Failed Parking Lock
Causes: Thinned worn brake friction plates, fatigue brake springs, pressure loss in brake chamber.
Consequence: Potential safety hazards during slope operation.
Swing Shaking & Excessive Clearance
Causes: Excessive clearance of main bearing, worn output shaft splines.
Consequence: Long-term impact will damage large gear ring of swing bearing.
VIII. One-Stop Supporting Supply List (Matching Parts for Whole System Assembly)
- Corresponding original swing motor assembly
- Swing Bearing (Slewing Ring) Assembly
- Swing Gear Oil & Complete Oil Seal Repair Kit
- Consumable Kit including mounting bolts, gaskets and dust seals
- Relevant accessories for swing central joint and swing oil distribution plate
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
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Business Type:
Trading Company,Distributor/Wholesaler,Manufacturer,Agent,Importer,Exporter
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Total Annual:
8000000-22000000
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Ecer Certification：
Verified Supplier
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