Overview
The ZF 4661.302.029 COVER is a critical sealing component designed for the WG 90 and WG 94 series transmissions. This OEM genuine part sits at the rear or intermediate section of the transmission housing, providing a secure barrier that protects internal gear assemblies and hydraulic circuits from contamination and pressure loss. As a factory-specified cover, it ensures precise alignment with the transmission case and maintains the structural integrity of the assembly. The SKU 4661.302.029 is directly interchangeable with original equipment, making it the preferred choice for rebuilders and fleet maintenance teams seeking a direct replacement without modification.
Symptoms of Failure
- Oil leaks at the rear cover seal: When the 4661.302.029 cover warps or its gasket surface degrades, transmission fluid seeps past the mating face, often pooling under the bell housing or along the output shaft area.
- Gear slipping under load: A compromised cover can allow internal pressure drops in the hydraulic control system, leading to delayed engagement or slipping in forward and reverse gears during heavy operation.
- Contaminated transmission fluid: Cracks or corrosion on the cover allow dirt and moisture to enter the transmission, resulting in gritty or milky fluid that accelerates wear on clutches and bearings.
- Unusual whining or grinding noises: Misalignment caused by a damaged cover can alter gear mesh patterns, producing audible noise that worsens as the transmission heats up.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.302.029 |
| Material | Die-cast aluminum alloy (A380) |
| Weight | 1.85 kg (4.08 lbs) |
| Dimensions (L x W x H) | 320 mm x 180 mm x 45 mm |
| OEM Reference | ZF 4661.302.029 |
| Surface Finish | Anodized, corrosion-resistant |
| Bolt Hole Pattern | 8 x M10 threaded holes |
Compatibility
This cover is engineered for the ZF WG 90 and WG 94 transmission families. It is also compatible with the following models where the rear cover interface is identical: WG 180, WG 200, and select WG 120 variants produced after 2005. Always verify the bolt pattern and gasket profile against your existing cover before installation. For complete assembly, this cover mounts directly to the 4661101024: TRANSMISSION HOUSING and aligns with the 4661301054: HOUSING II to form a sealed chamber. Secure the cover using the 0631306174: CYLINDRICAL PIN for precise dowel alignment, and affix the 0769123894: TYPE PLATE for identification after service.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101024 | TRANSMISSION HOUSING | Main structural case for gear sets |
| 4661301054 | HOUSING II | Intermediate housing section |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for cover |
| 0769123894 | TYPE PLATE | Identification and rating label |
| 0750100022 | SCREW PLUG | Seals oil drain port |
| 4660201008 | SCREW PLUG | Seals pressure test port |
| 0636100117 | SCREW PLUG | Seals filler hole |
| 0501211384 | VALVE | Hydraulic pressure regulation |
| 0732042156 | COMPRESSION SPRING | Valve return spring |
| 0768409154 | SCREW PLUG | Seals auxiliary port |
