Description
KMF40 708-2L-00050 Swing Motor Assembly Overview
The KMF40 708-2L-00050 Swing Motor assembly (OEM Part Numbers: 708-2L-00050, 708-2L-00051, 201-60-00020, KMF40) manufactured by Tatan is a high-torque Komatsu/Kayaba series hydraulic slewing motor belonging to our Excavator Swing Motor Assembly classification. Engineered specifically for Komatsu PC70-8, PC70-8E, and PC78US-8 7.0-to-8.5 ton excavators, replacing your worn slewing motor with a Tatan complete assembly restores 100% swing torque, precise holding brake capability, and smooth rotation speed instantly.
Built strictly according to original OEM specifications, this hydraulic swing motor integrates a heavy-duty planetary gear reduction gearbox and wet multi-disc parking brake, ensuring 100% direct bolt-on mounting to swing bearings without hose or flange modifications.
Key Attributes & Parameters for KMF40 708-2L-00050 Swing Motor
| Machine Model (适用机型) | Komatsu PC70-8 | PC70-8E | PC78US-8 | PC88MR-8 Excavator | ||
| Engine Model (适用发动机) | Komatsu SAA4D95LE-5 | Yanmar 4TNV98-E Engine | ||
| Product Category | Excavator Swing Motor Assembly | Warranty | 1 Year / 12 Months |
| Specific Motor Model | Komatsu KMF40 / KMF40-2 Motor | Brand Name | Tatan |
| OEM Part Number | 708-2L-00050 / KMF40 | 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 Inspection | Provided Before Shipping |
Supported Machinery Brands & Swing Motor Parts Coverage
In addition to Komatsu, Tatan manufactures replacement complete swing motors and reduction gearboxes for major excavator brands:
Application Scenarios & Buyer Value
When upgrading or replacing your 7-ton excavator slewing system with our KMF40 708-2L-00050 Swing Motor, buyers achieve maximum operational uptime and precise rotation control:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Komatsu PC70-8 Swing Motor Replacement | 1:1 direct bolt-on replacement eliminates machine downtime and restores original slewing speed. |
| Hydraulic Repair Workshops | Replaces tedious internal component rebuilding; reduces labor hours and eliminates aftermarket warranty risks. |
| Parts Dealers & Stockists | High-demand 7-ton excavator replacement motor ready for immediate resale to contractors and plant hire companies. |
| Rental Fleet Maintenance | Cost-effective replacement option extending total Komatsu 7-ton excavator service lifecycle. |
KMF40 708-2L-00050 Swing Motor OEM Diagnostic Guide
Use this OEM manual hydraulic diagnostic guide to troubleshoot slewing symptoms on your Komatsu PC70-8 excavator:
| Hydraulic/Mechanical Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Slow slewing speed & weak rotation torque under heavy bucket load | KMF40 motor piston shoe wear or anti-reverse relief valve leakage causing internal pressure drop (<24.5 MPa). | Install Tatan KMF40 complete swing motor assembly; flush hydraulic lines and adjust pilot relief valve pressure. |
| 2. Heavy metallic grinding noise in swing reducer gearbox | Planetary gear tooth pitting, sun gear wear, or needle bearing collapse due to insufficient gear oil lubrication. | Replace complete swing motor gearbox assembly; refill with heavy-duty SAE 80W-90 gear oil. |
| 3. Machine upper house drift / Brake slipping on incline slopes | Multi-disc wet parking brake friction plate wear or brake release pilot pressure line leakage. | Inspect brake release pilot pressure (>2.5 MPa); replace brake friction plates or install new swing motor assembly. |
| 4. Gear oil leaking into swing bearing tub | Lower shaft oil seal breakdown or casing drain line pressure spike blowing out drive pinion seal. | Clear casing drain return lines, replace lower pinion shaft seal with high-pressure NOK seal. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan KMF40 708-2L-00050 swing motor assembly undergoes anti-rust oiling, waterproof plastic sealing, and solid export wooden box packaging.
✈️ Express Air Courier
Partnered with DHL, FedEx, UPS, and TNT for 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 thick shockproof foam lining for maximum safety.
Quality Control & International Certificates
Tatan hydraulic swing motors are manufactured under ISO 9001 quality management systems and strictly comply with CE safety standards.
KMF40 708-2L-00050 Swing Motor FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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