MultiStar Cold – Your Source for Bus Air Conditioner Parts
The LANG KK73.1 series clutch (part number KK73,1,052,000,04) is a high-performance electromagnetic clutch assembly designed for heavy-duty bus air conditioning compressors. Featuring a 2A2B dual-groove stepped pulley with 260mm and 200mm diameters, it is specifically engineered for Bitzer and Bock compressors, including the 4UFCY, 4NFCY, 6UFCY, 6TFCY, and FK(X) series.
Multistar Cold is your one-stop supplier for bus AC and transport refrigeration parts – original new and China-made options at competitive prices.
CROSS-REFERENCE PART NUMBERS:
- KK73,1,052,000,04
OEM Code of LANG KK73,1,052,000,04 – Premium Electromagnetic Clutch – One-Stop Bus AC & Transport Refrigeration Parts Supplier
✨ Key Features & Benefits
- Heavy-Duty Torque Capacity – 450 Nm static torque for demanding 6-cylinder compressor applications
- Dual-Groove 2A2B Pulley – 260mm and 200mm stepped design for flexible belt system integration
- IP 64 Protection – Sealed against dust and water spray for harsh bus environments
- Dual Voltage Options – Available in 12V and 24V configurations
- Direct OEM Replacement – Fits Bitzer and Bock bus AC compressors
- One-stop supplier for bus AC & transport refrigeration parts
Drawings

📊 Technical Specifications
| Parameter | Specification |
|---|---|
| Clutch Series | KK 73.1 |
| Part Number | KK73,1,052,000,04 |
| Pulley Type | 2A2B (dual-groove stepped pulley) |
| Pulley Diameters | 260mm / 200mm |
| Torque (Static) | 450 Nm |
| Voltage | 12V / 24V |
| Current | 5.2A / 2.6A |
| Power | 62W |
| Security Class | IP 64 |
🚛 Compatible Compressors
| Brand | Model Series |
|---|---|
| Bitzer | 4UFCY, 4NFCY, 6UFCY, 6TFCY |
| Bock (GEA) | FK(X)4, FK(X)26, FK(X)40, FK(X)50 |
| Dorin | 4T |
🌍 Applications
| Application | Details |
|---|---|
| Bus & Coach AC | Bitzer 4U/4N/6U/6T and Bock FK(X) series compressors |
| Commercial Vehicle HVAC | Reliable cooling for passenger transport fleets |
| Heavy-Duty Refrigeration | Dorin 4T compressor applications |
| Advantage | Benefit |
|---|---|
| Factory Direct | No middlemen – competitive pricing |
| Quality Focus | OEM-grade materials and testing standards |
| Fast Delivery | Ready stock and quick production turnaround |
| Technical Support | Expert assistance for fitment verification |
| Global Reach | Shipping to 50+ countries worldwide |
| Flexible MOQ | Low minimum order quantities |
Multistar Cold – Your one-stop supplier for bus AC parts, transport refrigeration parts, Thermo King parts, and Carrier Transicold parts. OEM-grade quality, competitive pricing, and global shipping from China.





