Overview
The ZF 4642.301.048 DUMMY COVER is a critical sealing component designed for the WG 201 Series transmission family. This OEM genuine part, identified by SKU 4642.301.048, functions as a non-rotating closure plate that seals an unused accessory port or inspection opening on the transmission housing. Positioned on the exterior of the gearbox casing, it prevents contamination ingress and maintains internal hydraulic pressure. When installed alongside a TRANSMISSION HOUSING (4644101160) or a TRANSMISSION HOUSING (4644301323), this dummy cover ensures the structural integrity of the assembly is preserved during high-torque operations.
Symptoms of Failure
When the 4642.301.048 dummy cover deteriorates, operators often encounter distinct performance issues. Watch for these specific failure indicators:
- Hydraulic fluid seepage around the WG201 port cover – A worn gasket or cracked cover leads to visible oil drips beneath the transmission.
- Transmission overheating due to pressure loss – A compromised seal reduces system pressure, causing erratic gear engagement and elevated operating temperatures.
- Contaminated transmission fluid from debris ingress – Cracks in the dummy cover allow dirt and moisture to enter, accelerating internal wear.
- Vibration or rattling at the cover location – Loose fasteners or a warped cover plate produce audible noise during gear shifts.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4642.301.048 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Weight | 0.45 kg (1.0 lb) |
| Outer Diameter | 120 mm |
| Bolt Hole Pattern | 4 x M8 on 90 mm PCD |
| OEM Reference | ZF 4642.301.048 |
| Sealing Surface | Flat machined face with integrated O-ring groove |
Compatibility
This dummy cover is engineered specifically for the ZF WG 201 Series transmissions, including models WG180, WG200, and WG210. It is also compatible with select variants of the WG 200 Series where the port configuration matches. For proper installation, ensure the mating surface on the THREADED BUSH (4644301189) is clean, and secure the cover using a SCREW PLUG (4475280043) if the port is threaded. Always verify fitment against your specific transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main casing that encloses gear sets and shafts |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG201 models |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for covers and plugs |
| 4475280043 | SCREW PLUG | Seals unused threaded openings in the housing |
| 0634306198 | O-RING | Provides hydraulic seal between cover and housing |
| 0730365067 | TYPE PLATE | Identification plate riveted to the transmission |
| 4644301161 | COVER PLATE | Alternative cover for different port configurations |
| 0636100621 | HEXAGON SCREW | Fastener used to secure the dummy cover |
| 0631610020 | SET SCREW | Adjustable screw for precise alignment tasks |
| 0501218540 | BREATHER | Vents internal pressure while blocking contaminants |
