Overview
The ZF 4644.130.257 ENGINE CONNECTION is a critical interface component designed for the WG 200 Series transmission family. This OEM genuine part serves as the primary mechanical link between the engine flywheel housing and the transmission bell housing, ensuring precise alignment and torque transfer during operation. As a structural adapter, the ENGINE CONNECTION absorbs vibrational loads while maintaining a sealed environment for the drivetrain coupling. The SKU 4644.130.257 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit without modification. When paired with the 4644101223: TRANSMISSION HOUSING and 4644301225: TRANSMISSION HOUSING, this component completes the foundational assembly for heavy-duty industrial applications.
Symptoms of Failure
When the ENGINE CONNECTION begins to degrade, operators typically notice these specific failure indicators:
- Oil seepage at the engine-transmission interface: A worn gasket surface or cracked connection housing allows transmission fluid to escape, often visible as dark stains on the bell housing.
- Abnormal driveline vibration during acceleration: Misalignment caused by a fatigued connection point creates rhythmic shaking, particularly between 1200-1800 RPM.
- Difficulty engaging gears or gear slippage: Structural flex in the connection alters the input shaft angle, leading to incomplete clutch engagement and erratic shifting behavior.
- Metallic debris in transmission fluid: Friction from a loose connection generates fine metal particles, detectable during routine oil analysis.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.130.257 |
| OEM Reference | ZF 4644.130.257 |
| Material | High-grade aluminum alloy (EN AC-42100) |
| Weight | 2.85 kg (6.28 lbs) |
| Overall Length | 195 mm |
| Bolt Hole Pattern | 8x M12 on 160 mm PCD |
| Sealing Surface | Precision-machined, Ra 0.8 μm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This ENGINE CONNECTION is engineered for the ZF WG 200 Series, including models WG180, WG200, and WG210. It directly replaces the original factory component on transmissions built between 2005 and 2020. For proper installation, ensure the 0730365125: TYPE PLATE matches your transmission’s serial number, and verify the 4644301298: COVER PLATE is free of distortion. This part is not backward-compatible with pre-2000 WG series units without adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101223 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301225 | TRANSMISSION HOUSING | Secondary housing for auxiliary gear sets |
| 0730365125 | TYPE PLATE | Identification plate with serial number |
| 4644301298 | COVER PLATE | Seals the inspection access port |
| 0634306525 | O-RING | Hydraulic seal for connection joint |
| 0636305026 | SCREW PLUG | Threaded plug for drain/fill ports |
| 4644301279 | SCREEN SHEET | Filter mesh for fluid intake |
| 4644301088 | SEALING CAP | Protective cap for unused ports |
| 4644106319 | SHIFT SYSTEM | Hydraulic shift actuator assembly |
| 4644159300 | SHIFT SYSTEM | Electronic shift control module |
