Overview
The ZF 4646.301.235 COVER SHEET is a critical sealing and protective component designed specifically for the WG 250 Series transmission. This OEM genuine part sits at the interface between the main transmission housing and the clutch or converter assembly, serving as a barrier against contamination and fluid loss. By maintaining the structural integrity of the gearbox enclosure, the 4646.301.235 ensures consistent hydraulic pressure and prevents debris ingress that could compromise gear engagement. As an original equipment manufacturer (OEM) part, it guarantees exact fitment and material compatibility with your ZF WG250 powertrain, reducing the risk of premature wear on adjacent components like the TRANSMISSION HOUSING.
Symptoms of Failure
When the ZF 4646.301.235 COVER SHEET degrades, operators may notice several distinct failure indicators. Oil seepage around the bell housing area is the most common symptom, often appearing as a thin film of ATF on the transmission exterior. Gear slipping under load can occur if the cover sheet warps, allowing internal pressure to drop below operational thresholds. Unusual metallic rattling or vibration from the transmission mid-section suggests the cover sheet has loosened or cracked, permitting misalignment of the HOUSING assembly. Finally, contaminated transmission fluid (dark or gritty) may indicate the cover sheet has failed to seal against road grit and moisture, accelerating internal wear.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 4646.301.235 |
| Material | High-strength aluminum alloy with corrosion-resistant coating |
| Overall Dimensions | 320 mm x 220 mm x 12 mm (approx.) |
| Bolt Hole Pattern | 8-hole, M10 thread, 180 mm PCD |
| Weight | 1.45 kg (3.2 lbs) |
| OEM Reference | ZF 4646.301.235 (Genuine) |
| Surface Finish | Anodized matte, gasket-ready |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This COVER SHEET is engineered for the ZF WG 250 Series, but its mounting geometry also suits several related ZF off-highway and industrial transmissions. It is directly compatible with the WG180, WG200, and WG250 models. Additionally, it can be used as a service replacement in earlier WG160 and WG300 variants, provided the COVER and HEXAGON SCREW fasteners are also updated. Always verify bolt hole alignment with your specific transmission housing before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101029 | TRANSMISSION HOUSING | Main structural enclosure for gear train |
| 4646301090 | HOUSING | Secondary housing for clutch pack assembly |
| 4646301087 | COVER | Top cover plate for access port |
| 0636015304 | HEXAGON SCREW | M10 bolt for cover sheet retention |
| 0636101828 | CAP SCREW | M8 socket head fastener for housing |
| 4646301102 | COVER SHEET | Alternate gasket variant for WG200 |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for cover positioning |
| 0636101193 | CAP SCREW | M6 bolt for type plate attachment |
| 0636010174 | HEXAGON SCREW | M12 bolt for housing-to-bell housing joint |
