Overview
The ZF 4644.152.525 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 series transmissions. This OEM genuine part serves as the primary mechanical link between the engine output and the transmission input shaft, absorbing torsional vibrations and ensuring smooth torque transfer under heavy loads. The SKU 4644.152.525 is precision-machined to factory tolerances, making it a direct replacement for worn units in ZF powershift gearboxes. When installed alongside a TRANSMISSION HOUSING (4644101164) or a TRANSMISSION HOUSING (4644301371), this coupling maintains the structural integrity of the entire assembly, preventing misalignment that can lead to premature bearing failure.
Symptoms of Failure
- Transmission shudder during engagement: A worn 4644.152.525 coupling causes noticeable vibration or jerking when shifting between forward and reverse, especially under load in WG 200 series units.
- Metallic clicking from the bell housing: As the coupling splines wear, you may hear a distinct clicking or knocking sound at idle or low RPM, indicating excessive backlash in the driveline.
- Oil contamination near the input seal: A failing coupling can distort the input shaft, leading to seal leaks. Look for fluid weeping around the O-RING (0634306525) interface.
- Reduced power transfer efficiency: Operators may report sluggish acceleration or a feeling of “slipping” under heavy torque, as the coupling loses its ability to maintain a rigid connection.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4644.152.525 |
| Material | High-tensile alloy steel (heat-treated) |
| Outer Diameter | 152 mm |
| Overall Length | 85 mm |
| Spline Count | 24 (internal) |
| Weight | 2.8 kg (6.2 lbs) |
| Surface Finish | Phosphate-coated for corrosion resistance |
| Operating Torque Range | 1,200 – 1,800 Nm |
Compatibility
This coupling is designed for ZF WG 180 and WG 200 series powershift transmissions used in industrial vehicles, construction equipment, and heavy-duty trucks. It is a direct fit for models equipped with the TYPE PLATE (0730365067) identifying the WG 200 variant. The part also interfaces with the GROOVED STUD (0631311009) for secure mounting. While primarily intended for WG 180 and WG 200, it may also be compatible with certain WG 150 series units after verifying spline engagement. Always cross-reference your transmission serial number with the OEM specifications before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101164 | TRANSMISSION HOUSING | Encloses and supports gear train components |
| 4644301371 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 |
| 0730365067 | TYPE PLATE | Identifies transmission model and specs |
| 0631311009 | GROOVED STUD | Secures coupling to flywheel assembly |
| 4644303060 | COVER PLATE | Protects internal components from debris |
| 4644201011 | COVER PLATE | Seals the top access port |
| 4644201010 | COVER PLATE | Lower cover for oil pan area |
| 4644301372 | COVER PLATE | Side access cover for maintenance |
| 0636610028 | STUD | Mounting fastener for housing sections |
| 0634306525 | O-RING | Seals fluid passages between components |
