Description
4187042 Swing Motor Assembly Overview
The 4187042 Swing Motor assembly (OEM Part Numbers: 4187042, 4192631, 4189399, 4187040) manufactured by Tatan is a heavy-duty hydraulic slewing device belonging to our Excavator Swing Motor Assembly classification. Engineered specifically for Hitachi EX100-1, EX100M-1, and EX100WD-1 11-ton excavators, replacing your worn slewing drive with a Tatan complete 4187042 Swing Motor unit restores precise 10.5 RPM rotation speed, positive multi-disc parking brake holding, and smooth upper-structure swing torque instantly.
Built strictly according to original Hitachi specifications, this complete swing motor package comes pre-fitted with planetary reduction gears and wet disc brakes, ensuring 100% direct bolt-on fitment to the upper frame and swing bearing ring gear without alteration.
Key Attributes & Parameters for 4187042 Swing Motor
| Product Category | Excavator Swing Motor Assembly | Warranty | 1 Year / 12 Months |
| Specific Motor Model | Hitachi Dash-1 Slewing Motor & Gearbox | Brand Name | Tatan |
| Compatible Equipment | Hitachi EX100-1 | EX100M-1 Excavator | OEM Part Number | 4187042 / 4192631 |
| Matched Engine Series | Isuzu 4BD1 / 4BD1T Diesel Engine | Place of Origin | Guangdong, China |
| Max Relief Pressure | 24.5 MPa (245 bar / 3550 PSI) | Rated Swing Speed | 10.5 RPM Slewing Rate |
| Brake System | Mechanical Multi-Disc Wet Brake | Pinion Shaft Spec | 13-Teeth Drive Pinion (13T) |
| Machinery Test Report | Provided (100% Bench Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Quality Status | 100% Brand New Complete Unit | Packaging | Export Wooden Box Packaging |
Supported Machinery Brands & Swing Motor Coverage
In addition to Hitachi, Tatan manufactures replacement complete swing motors and reduction gearboxes for major excavator brands:
Application Scenarios & Buyer Value
When replacing your 11-ton excavator slewing mechanism with our 4187042 Swing Motor, mechanics and operators achieve absolute rotational control:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Hitachi EX100-1 Slewing Restoration | Stops machine cab drifting on slopes and restores snappy, precise 360-degree rotation. |
| Hydraulic Repair Workshops | Avoids the tedious process of rebuilding scored reducer housings; drop-in unit saves workshop man-hours. |
| Utility & Civil Contractors | Ensures reliable swing lock when parked on uneven ditch banks during pipe placement. |
| Export Parts Stockists | Readily available replacement swing motor ready for immediate shipment to overseas repair yards. |
4187042 Swing Motor OEM Diagnostic Guide
Use this technical diagnostic guide to identify swing motor failures on your Hitachi EX100-1 excavator:
| Hydraulic/Mechanical Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Cab drifts downhill when parked on an incline | Worn multi-disc wet parking brake friction plates or low brake-release pilot pressure holding the spring-applied brake open. | Install Tatan complete 4187042 Swing Motor unit; verify pilot brake-release pressure meets 2.5 MPa. |
| 2. Metallic grinding noise inside the reducer housing | Planetary gear tooth pitting, sun gear wear, or tapered bearing failure from contaminated or depleted gear oil. | Replace with a new pre-filled complete swing assembly; maintain SAE 80W-90 gear oil every 1,000 hours. |
| 3. Sluggish swing acceleration under heavy bucket loads | Internal axial piston slipper wear or cross-over relief valve seat scoring dropping motor torque below 24.5 MPa. | Replace with a factory-bench-tested Tatan swing motor to instantly restore full rotation torque. |
| 4. Gear oil leaking into the turntable bearing tub | Bottom output shaft oil seal failure caused by excessive casing drain line backpressure or bearing play. | Clear casing drain return hose to main tank, and install our upgraded unit featuring dual-lip high-pressure seals. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan 4187042 swing motor assembly is preserved with anti-corrosion oil, sealed in heavy poly film, and strapped inside an export-grade wooden crate.
✈️ Express Air Courier
Partnered with DHL, FedEx, UPS, and TNT for 3-7 day express door-to-door delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL ocean container shipping for heavy swing motor assemblies and bulk orders.
📦 Export Wooden Cases
Fumigated solid wooden boxes with custom high-density foam inserts to prevent shipping shock.
Quality Control & International Certificates
Tatan hydraulic components are manufactured under ISO 9001 certified quality control systems and strictly comply with CE safety standards.
4187042 Swing Motor FAQ & Related Categories
🔗 Frequently Purchased Together with EX100-1 Swing Motor:
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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