Overview
The ZF 4657.304.026 COVER is a precision-engineered OEM genuine component designed for the WG 190 and WG 210 series transmissions. This cover serves as a critical sealing and protective barrier, mounting directly onto the transmission housing to shield internal gear sets and hydraulic circuits from contaminants while maintaining proper oil pressure. As an integral part of the rear assembly, the 4657.304.026 ensures structural integrity and fluid retention. When paired with the 4657101042: TRANSMISSION HOUSING, it creates a sealed environment essential for reliable power transfer in heavy-duty industrial applications.
Symptoms of Failure
- External oil leaks around the rear cover seal – A worn or cracked 4657.304.026 cover often results in visible fluid seepage, leading to low transmission oil levels and potential overheating.
- Gear slipping under load – When the cover loses its sealing capability, hydraulic pressure drops, causing erratic shifting or slipping in WG 190/WG 210 units.
- Contaminated transmission fluid – A compromised cover allows dirt and moisture ingress, accelerating wear on internal components like the 4657201028: HOUS.FRONT SECT.
- Unusual noise from the rear section – Misalignment or deformation of the cover can create vibration or grinding sounds during operation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4657.304.026 |
| Material | Die-cast aluminum alloy |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 320 mm x 240 mm x 45 mm |
| OEM Reference | ZF 4657.304.026 |
| Seal Type | Integrated gasket groove |
| Fastener Torque | 45 Nm (33 ft-lbs) |
Compatibility
This genuine ZF cover is primarily designed for the WG 210 Series transmissions, with direct fitment on WG 190 and WG 210 models. It is also compatible with select variants of the WG 180 and WG 200 series when used in conjunction with the 4657201013: HOUSING REAR PART. For proper installation, ensure the 0631306792: CYLINDRICAL PIN is aligned correctly to prevent misalignment. Always verify your transmission model against the OEM parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101042 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201028 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201013 | HOUSING REAR PART | Rear housing section for output support |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for cover positioning |
| 0636100801 | CAP SCREW | Fastener for cover attachment |
| 4656301148 | FIXING PLATE | Retention plate for cover stability |
| 4657301034 | SCREEN SHEET | Filter mesh for oil intake |
| 4657301035 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Alternate fastener for cover |
| 4656301048 | OIL FEED.HOUSG. | Oil supply channel housing |
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