Overview
The ZF 4644.130.251 ENGINE CONNECTION is a critical OEM genuine interface component designed specifically for the WG 200 Series transmission family. This precision-engineered part serves as the mechanical link between the engine flywheel housing and the transmission bell housing, ensuring perfect axial alignment and torque transfer during operation. As a genuine ZF component, the SKU 4644.130.251 guarantees factory tolerances and material specifications that aftermarket alternatives cannot match. When installed alongside the 4644101177 TRANSMISSION HOUSING and the 4644301229 TRANSMISSION HOUSING, this engine connection forms the structural backbone of the drivetrain assembly.
Symptoms of Failure
When the ZF 4644.130.251 ENGINE CONNECTION begins to wear, operators may notice several distinct failure indicators. Oil seepage at the engine-to-transmission mating surface is the most common early warning sign, often appearing as a thin film of ATF around the joint. Abnormal gear engagement hesitation can occur when the connection loses its precise alignment, causing the input shaft to bind. Vibration during acceleration under load frequently indicates that the connection has developed microscopic fatigue cracks. Progressive transmission fluid loss without visible external leaks may point to internal seal degradation within this component. Addressing these symptoms promptly prevents cascading damage to the 0730365067 TYPE PLATE and other adjacent assemblies.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4644.130.251 |
| Material | High-strength aluminum alloy with corrosion-resistant coating |
| Overall Diameter | 210 mm (8.27 in) |
| Overall Length | 85 mm (3.35 in) |
| Bolt Hole Pattern | 6-hole, 180 mm BCD |
| Weight | 1.45 kg (3.20 lbs) |
| Seal Type | Integrated PTFE lip seal |
| Operating Temperature Range | -40°C to +120°C |
| OEM Reference | ZF 4644.130.251 |
Compatibility
This engine connection is engineered primarily for the ZF WG 200 Series transmissions, including models WG200, WG201, and WG202. It also demonstrates cross-compatibility with the WG180 Series when used with the appropriate 0631311009 GROOVED STUD kit. The part is designed to interface with SAE 3 and SAE 4 flywheel housings commonly found in medium-duty commercial vehicles, construction equipment, and agricultural machinery. Always verify your transmission’s serial number against ZF’s compatibility matrix before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101177 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301229 | TRANSMISSION HOUSING | Secondary housing for valve body integration |
| 0730365067 | TYPE PLATE | Identification plate with transmission specs |
| 0631311009 | GROOVED STUD | Alignment fastener for housing connection |
| 4644303060 | COVER PLATE | Access cover for inspection port |
| 4644303061 | COVER PLATE | Alternate cover plate for PTO opening |
| 0634306525 | O-RING | Hydraulic seal for fluid passages |
| 0636305026 | SCREW PLUG | Threaded plug for drain/fill ports |
| 0501316470 | BREATHER | Pressure equalization vent |
| 4644301279 | SCREEN SHEET | Filter mesh for oil pickup |
