Overview
The ZF 4644.306.289 COVER PLATE is a critical sealing and structural component designed for the WG150, WG180, WG200, and WG201 series transmissions. This OEM genuine part mounts directly to the transmission housing to protect internal assemblies from contaminants while maintaining proper hydraulic pressure. The SKU 4644.306.289 serves as a precision-machined barrier that interfaces with the shift system and gasket surfaces, ensuring that oil flow remains uninterrupted and that the transmission’s internal environment stays debris-free. When installed alongside the TRANSMISSION HOUSING (4642101109) or the TRANSMISSION HOUSING (4642301205), this cover plate forms a sealed enclosure that is essential for long-term drivetrain reliability.
Symptoms of Failure
- Oil seepage around the cover plate perimeter: A worn or warped 4644.306.289 often leads to visible fluid leaks at the joint, especially after thermal cycling. This is a common “ZF transmission cover plate leak” search query.
- Contaminant ingress causing gear slipping: When the cover plate loses its seal, dirt and moisture enter the housing, leading to premature wear on clutches and bands. This manifests as “WG transmission slipping under load.”
- Abnormal noise from the shift mechanism: A loose or cracked cover plate can allow the shift system to vibrate, producing a distinct rattle or grinding sound during gear changes. This is frequently reported as “ZF WG200 shift noise.”
- Hydraulic pressure drop: A compromised seal from the cover plate reduces system pressure, resulting in delayed engagement or harsh shifting. Technicians often search for “ZF transmission pressure loss cover plate.”
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.306.289 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Overall Dimensions | 210 mm x 145 mm x 12 mm |
| Bolt Hole Pattern | 6 x M8 on 170 mm centers |
| OEM Reference | ZF 4644.306.289 (Genuine) |
| Surface Finish | Machined sealing face, Ra 0.8 µm |
Compatibility
This cover plate is engineered for the ZF WG150, WG180, WG200, and WG201 series transmissions. It is a direct fit for all variants within these families, including the WG150-1, WG180-3, WG200-2, and WG201-1 models. The part is designed to mate with both the 4642101109 TRANSMISSION HOUSING and the 4642301205 TRANSMISSION HOUSING, as well as the 0730365125 TYPE PLATE for identification. For secure mounting, use the 0631311009 GROOVED STUD to ensure proper alignment and torque retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365125 | TYPE PLATE | Identification tag for transmission model and serial number |
| 0631311009 | GROOVED STUD | Alignment and fastening stud for cover plate installation |
| 4642301168 | SCREEN SHEET | Oil filter screen for debris protection |
| 4642301169 | SCREEN SHEET | Secondary oil filter screen variant |
| 0636100621 | HEXAGON SCREW | Fastener for securing cover plate to housing |
| 4642301186 | SCREEN SHEET | Fine-mesh screen for hydraulic circuit |
| 4644106231 | SHIFT SYSTEM | Complete shift mechanism assembly |
| 4644306470 | GASKET | Sealing gasket for cover plate interface |
