Overview
The ZF 4644.311.089 COVER is a critical sealing and protective component engineered for the WG 180 and WG 200 series transmissions. Positioned on the exterior of the main gearbox assembly, this OEM genuine part encloses the internal mechanisms, safeguarding them from contaminants while retaining essential lubrication. As a factory-specified replacement, the SKU 4644.311.089 ensures a precise fit and maintains the structural integrity of the transmission housing. This cover works in direct conjunction with the TRANSMISSION HOUSING (4644101047) to form a sealed environment, and it is often mounted adjacent to the HOUSING (4644301380) component. Replacing a worn or damaged cover is essential for preventing system contamination and maintaining hydraulic pressure within the transmission.
Symptoms of Failure
When the ZF 4644.311.089 COVER begins to fail, operators will notice distinct performance issues. Look for these specific warning signs:
- External oil seepage around the cover perimeter: A cracked or warped cover allows transmission fluid to escape, leading to low fluid levels and potential overheating.
- Contaminated transmission fluid: A compromised seal allows dirt and moisture to enter the gearbox, causing accelerated wear on internal components like the THREADED BUSH (4644301189).
- Unusual gear engagement noise: Loss of lubrication pressure due to a leaking cover can result in grinding or whining sounds during shifting.
- Visible corrosion or deformation on the cover surface: Physical damage from road debris or improper installation compromises the cover’s ability to maintain a tight seal.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4644.311.089 |
| OEM Reference | ZF 4644.311.089 |
| Material | Die-cast aluminum alloy |
| Estimated Weight | 1.2 kg (2.65 lbs) |
| Estimated Dimensions | 220 mm x 150 mm x 45 mm |
| Surface Treatment | Corrosion-resistant coating |
| Mounting Type | Bolt-on with sealing gasket |
Compatibility
This cover is specifically designed for the ZF WG 181 Series, with direct compatibility across the WG 180 and WG 200 transmission families. It is a standard fitment for models including the WG 180, WG 181, and WG 200. The part is also suitable for certain variants of the ZF Ecolife and Ecomat series that share the same housing architecture. Always verify the casting number on your existing cover before ordering. For complete assembly, this cover is installed alongside the TYPE PLATE (0730365067), which provides critical identification data for your transmission model.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4644301380 | HOUSING | Secondary housing for valve body |
| 4644301189 | THREADED BUSH | Provides threaded anchor points for fasteners |
| 0730365067 | TYPE PLATE | Identification plate with model/serial numbers |
| 0631311009 | GROOVED STUD | Alignment and fastening stud for cover |
| 4644301161 | COVER PLATE | Secondary access cover for inspection |
| 0636100621 | HEXAGON SCREW | Fastener for securing cover assembly |
| 0631610020 | SET SCREW | Adjustment screw for pressure settings |
| 0634801098 | SEALING RING | Prevents fluid leakage at joints |
| 4644301117 | FIXING PLATE | Retains cover in position under vibration |
