Overview
The ZF 4651.306.004 COVER PLATE is a critical sealing and structural component designed specifically for the WG 100 series transmission. This OEM genuine part, identified by SKU 4651.306.004, mounts directly to the rear of the transmission housing, providing a secure barrier that protects internal gear sets and hydraulic circuits from contamination while maintaining proper fluid pressure. As a precision-engineered cover plate, it interfaces seamlessly with the 4651101004: TRANSMISSION HOUSING and the 4651301014: HOUSING to ensure optimal alignment and load distribution during high-torque operations.
Symptoms of Failure
When the ZF 4651.306.004 cover plate deteriorates, operators often notice specific performance issues. External oil seepage around the rear transmission flange is a primary indicator, as the plate’s sealing surface warps or corrodes over time. Gear engagement hesitation or slipping under load can occur when fluid pressure drops due to a compromised cover plate seal. Unusual metallic rattling from the transmission housing suggests the plate has loosened, allowing internal components to shift. Contaminated transmission fluid with visible metal particles may also appear if the cover plate fails to shield the gear train from debris ingress.
Technical Specifications
| Part Number | 4651.306.004 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Overall Dimensions | 280 mm x 180 mm x 12 mm (approx.) |
| Bolt Hole Pattern | 8 x M10 threaded holes on 220 mm PCD |
| Weight | 1.45 kg (3.2 lbs) |
| OEM Reference | ZF 4651.306.004 (Genuine) |
| Sealing Surface | Precision-machined flat face for O-ring compatibility |
Compatibility
This cover plate is engineered for the ZF WG 100 series, but its design also supports several related transmission models due to shared bolt patterns and housing interfaces. It is directly compatible with the WG180, WG200, and WG250 transmissions, as well as the WG 100 variant. For proper installation, always pair this part with a new 0634303928: O-RING to ensure a leak-proof seal against the 4651301008: TRANSMISSION HOUSING. Verify your specific model’s housing configuration before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101004 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4651301014 | HOUSING | Secondary housing for auxiliary components |
| 0634303928 | O-RING | Seals cover plate to housing interface |
| 4651301008 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic fluid flow |
| 4651303005 | SCREEN SHEET | Secondary filtration element for oil circuit |
| 0636101032 | CAP SCREW | Fastens cover plate to housing |
| 0630361028 | SEALING CAP | Closes unused ports on transmission |
| 0636304032 | SCREW PLUG | Seals threaded openings in housing |
| 0634303312 | O-RING | Provides secondary sealing for plugs |
