Overview
The ZF 4656.354.021 COVER SHEET is a critical sealing and structural component engineered specifically for the WG 210 series transmission. This OEM genuine part sits at the interface between the main transmission housing and the rear section, providing a secure barrier that contains hydraulic fluid and protects internal gear sets from external contaminants. As a factory-specification cover, the SKU 4656.354.021 ensures precise alignment with the 4657101033: TRANSMISSION HOUSING and the 4657201027: HOUS.FRONT SECT, forming a sealed assembly that maintains optimal oil pressure and thermal stability during heavy-duty operation.
Symptoms of Failure
When the ZF 4656.354.021 cover sheet deteriorates, operators typically encounter three distinct failure modes. First, external oil seepage around the WG210 rear cover becomes visible, often leaving wet streaks on the transmission casing. Second, intermittent gear engagement hesitation during low-speed maneuvers may occur as hydraulic pressure drops due to fluid bypassing the worn cover. Third, contaminated transmission fluid with metallic debris can appear if the cover sheet cracks, allowing particles from the clutch packs to circulate. Finally, audible whining or grinding noises from the transmission rear section often accompany a compromised cover, indicating misalignment with the 4657201012: HOUSING REAR PART.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4656.354.021 |
| Material | High-tensile steel with anti-corrosion coating |
| Overall Dimensions | 210 mm x 145 mm x 8 mm |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4656.354.021 |
| Mounting Holes | 6 x M10 threaded bores |
| Sealing Surface | Precision-ground flatness tolerance ±0.05 mm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This cover sheet is primarily designed for the ZF WG210 series transmissions, which include the WG210, WG211, and WG212 variants. It also fits select models in the WG180 and WG200 families where the rear cover interface dimensions match. The part integrates directly with the 0631306792: CYLINDRICAL PIN for precise alignment during installation. For complete assembly, verify that your transmission uses the same bolt pattern as the WG210 series; cross-reference with the 0636100801: CAP SCREW and 0636100803: CAP SCREW fasteners for secure mounting.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201012 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for cover positioning |
| 0636100801 | CAP SCREW | M10 fastener for cover attachment |
| 4656301148 | FIXING PLATE | Retention bracket for cover sheet |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | M8 fastener for auxiliary brackets |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil supply channel housing |
