Overview
The ZF 4646.301.300 COVER is a precision-engineered OEM genuine component designed for the WG 250, WG 260, and WG 310 transmission series. This part serves as a critical sealing and protective barrier, positioned on the exterior of the transmission housing to shield internal gears, bearings, and hydraulic circuits from contaminants while maintaining proper oil pressure. As a direct replacement for the original factory-installed cover, the SKU 4646.301.300 ensures exact fitment and durability under high-torque industrial applications. It integrates seamlessly with the TRANSMISSION HOUSING (4646101062) and the HOUSING (4646301104) to form a robust assembly that withstands extreme operational stresses.
Symptoms of Failure
When the ZF 4646.301.300 COVER deteriorates, operators often encounter distinct performance issues. Look for these specific failure symptoms:
- External oil seepage around the cover perimeter: A worn gasket or cracked cover allows transmission fluid to escape, leading to low oil levels and potential overheating.
- Gear engagement hesitation or slipping: Loss of hydraulic pressure due to a compromised cover can cause delayed shifting or erratic gear changes under load.
- Visible corrosion or deformation on the cover surface: Exposure to road debris or thermal cycling may warp the metal, creating gaps that compromise sealing integrity.
- Increased operational noise from the transmission area: A loose or damaged cover can vibrate, producing a distinct rattling sound that indicates imminent failure.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4646.301.300 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Weight | 1.45 kg (3.2 lbs) |
| Dimensions (L x W x H) | 210 mm x 150 mm x 45 mm |
| OEM Reference | ZF 4646.301.300 (Genuine) |
| Bolt Torque Specification | 25 Nm (18.4 ft-lbs) with HEXAGON SCREW (0636015304) |
Compatibility
This cover is engineered for ZF WG-series transmissions, specifically the WG 250, WG 260, and WG 310 models. It is also compatible with earlier WG 180 and WG 200 variants when used with the appropriate CONNECTING PART (4646323018). For installations requiring additional sealing, pair it with the COVER SHEET (4646301100) or COVER SHEET (4646301112). Always verify fitment by cross-referencing your transmission serial number with the OEM specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101062 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4646301104 | HOUSING | Secondary housing for hydraulic components |
| 4646323018 | CONNECTING PART | Links cover to transmission housing |
| 0636015304 | HEXAGON SCREW | Fastener for cover mounting |
| 0636101828 | CAP SCREW | Secures auxiliary brackets |
| 4646301100 | COVER SHEET | Gasket layer for sealing |
| 4646301112 | COVER SHEET | Alternate gasket for thicker applications |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for cover positioning |
| 0636101193 | CAP SCREW | Fastener for cover sheet retention |
