Overview
The ZF 4646.302.158 CUBIERTA DE RODAMIENTO is a precision-engineered bearing cover designed for the WG250, WG258, and WG308 transmission series. This OEM original component sits directly over the main bearing assembly within the transmission housing, securing the bearing in place and preventing axial movement during high-torque operations. As a critical sealing element, it protects the internal bearing race from contamination while maintaining proper lubrication pressure. The SKU 4646.302.158 is manufactured to ZF’s exacting tolerances, ensuring a perfect fit when paired with the TRANSMISSION HOUSING (4646101028) and the HOUSING (4646301095) assembly. This cover is essential for maintaining gear alignment and reducing vibration in heavy construction machinery transmissions.
Symptoms of Failure
- Oil leakage around the bearing cover seal: When the 4646.302.158 wears or cracks, transmission fluid seeps past the bearing area, leaving visible drips under the equipment. This is a common long-tail search query for “ZF transmission oil leak at bearing cover.”
- Abnormal bearing noise or whining: A failing cubierta de rodamiento allows the bearing to shift slightly, creating a rhythmic whining or grinding sound during gear engagement, especially under load.
- Gear slippage or delayed engagement: Loss of bearing preload due to a compromised cover can cause the gear train to misalign, leading to intermittent slipping or hesitation when shifting between forward and reverse.
- Metal debris in transmission fluid: As the cover deteriorates, it may shed small metal particles into the oil, detectable during routine fluid changes or filter inspections.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4646.302.158 |
| Material | High-strength cast iron (GGG-40) |
| Outer Diameter | 180 mm |
| Inner Diameter | 120 mm |
| Thickness | 22 mm |
| Weight | 1.45 kg |
| OEM Reference | ZF 4646.302.158 |
| Surface Finish | Machined with phosphate coating |
| Bolt Hole Pattern | 6 x M10 (equally spaced) |
Compatibility
This bearing cover is engineered for the ZF WG-series powershift transmissions commonly used in construction machinery such as wheel loaders, graders, and dump trucks. Based on the part type and dimensions, the 4646.302.158 is compatible with the following ZF transmission models:
- WG250 – Most common application for medium-duty loaders
- WG258 – Heavy-duty variant with reinforced housing
- WG308 – High-torque version for large-scale earthmoving equipment
- WG180 – Smaller frame models (verify bolt pattern)
- WG200 – Mid-range models (requires confirmation of cover thickness)
For proper installation, this cover works in conjunction with the COVER (4646301087) and is secured using the HEXAGON SCREW (0636015304). Always inspect the mating surface on the transmission housing for wear before reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101028 | TRANSMISSION HOUSING | Main casing that encloses all gear components |
| 4646301095 | HOUSING | Intermediate housing for bearing support |
| 4646301087 | COVER | Outer cover for the bearing cavity |
| 0636015304 | HEXAGON SCREW | Fastener for securing the bearing cover |
| 0636101828 | CAP SCREW | High-tensile bolt for housing assembly |
| 4646301102 | COVER SHEET | Thin gasket plate for sealing |
| 4646301098 | COVER SHEET | Alternate gasket for different housing variants |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment stud for precise cover placement |
| 0636101193 | CAP SCREW | Additional fastener for cover retention |
