Overview
The ZF 4651.306.104 COVER PLATE is a precision-engineered OEM genuine component designed for the WG 100 series transmission family. This cover plate serves as a critical sealing and protective barrier, securing internal hydraulic circuits and preventing contamination from entering the gear train. Positioned on the main housing assembly, the SKU 4651.306.104 interfaces directly with the 4651101009: TRANSMISSION HOUSING to maintain structural integrity under high torque loads. Its robust construction ensures proper alignment of internal shafts and gaskets, making it indispensable for long-term transmission reliability.
Symptoms of Failure
When the ZF 4651.306.104 cover plate degrades, operators may notice several distinct failure modes. Oil seepage around the WG100 bell housing is the most common indicator, often appearing as a thin film of ATF near the mating surface. Intermittent gear slippage under load can occur if the cover plate warps, allowing hydraulic pressure to bleed past internal seals. Metallic debris in the transmission pan suggests the plate has fractured, releasing particles into the oil circuit. Increased operating noise during cold starts may also point to a loose or cracked cover plate that fails to dampen gear chatter.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4651.306.104 |
| Material | Die-cast aluminum alloy (A380) |
| Overall Dimensions | 210 mm x 145 mm x 18 mm |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4651.306.104 |
| Surface Finish | Anodized, corrosion-resistant |
| Bolt Pattern | 6x M10 threaded holes |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This cover plate is engineered primarily for the ZF WG 100 series, but its mounting geometry also suits the WG 180 and WG 200 models when paired with the correct 0634303928: O-RING for sealing. It is compatible with both the 4651301025: HOUSING and the 4651301031: HOUSING variants used in heavy-duty off-highway applications. Always verify the bolt pattern matches your specific transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101009 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4651301025 | HOUSING | Secondary housing for valve body integration |
| 0634303928 | O-RING | Seals cover plate to housing interface |
| 4651301031 | HOUSING | Alternate housing for WG200 series |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4651303005 | SCREEN SHEET | Fine mesh screen for oil return circuit |
| 0636101032 | CAP SCREW | Fastens cover plate to housing |
| 0630361028 | SEALING CAP | Protects unused ports from contamination |
| 4475280060 | SCREW PLUG | Seals pressure test ports |
| 0634303312 | O-RING | Secondary seal for plug interfaces |
