Overview
The ZF 4699.301.222 COVER is a critical sealing and structural component designed for heavy-duty construction machinery transmissions. This OEM genuine part, identified by SKU 4699.301.222, mounts directly onto the transmission housing to protect internal gear sets and hydraulic components from external contaminants while maintaining proper oil pressure. As a factory-specification cover, it ensures precise alignment with the transmission case and prevents lubricant migration between chambers. When installed alongside the 4699101086 HOUSING and 4699301223 HOUSING, this cover forms a sealed barrier that is essential for maintaining drivetrain integrity in excavators, loaders, and graders.
Symptoms of Failure
- Transmission fluid seepage at the cover joint: When the 4699.301.222 gasket surface degrades, oil leaks appear around the perimeter, often mistaken for a housing crack. This is a common “ZF transmission cover leak” search query.
- Contaminated transmission oil: A warped or cracked cover allows dirt and moisture ingress, leading to premature gear wear. Operators may notice “metal shavings in ZF transmission oil” during routine checks.
- Intermittent gear engagement hesitation: Loss of hydraulic pressure due to cover deformation causes delayed clutch pack engagement, especially under load. This symptom aligns with “ZF transmission slipping under load” diagnostics.
- Visible corrosion or pitting on the cover face: In salt-spray environments, the aluminum alloy can corrode, creating uneven sealing surfaces that require immediate replacement.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.301.222 |
| Material | Die-cast aluminum alloy (EN AC-44300) |
| Overall Dimensions | 285 mm x 195 mm x 45 mm |
| Bolt Hole Pattern | 8 x M10 threaded holes on 230 mm centers |
| Weight | 1.85 kg (4.08 lbs) |
| OEM Reference | ZF 4699.301.222 (Genuine) |
| Surface Finish | Machined sealing face, black anodized |
Compatibility
This cover is engineered for ZF’s WG series powershift transmissions commonly used in construction machinery. It directly fits the WG180, WG200, and WG210 models found in Volvo, Case, and Caterpillar equipment. The 4699.301.222 also serves as a replacement in certain ZF 4WG-200 and 6WG-250 torque converter transmissions. For proper installation, always pair this cover with a new 0636302022 SCREW PLUG and 0501319149 SCREW PLUG to seal the drain and fill ports. Verify your transmission serial number against ZF application charts before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101086 | HOUSING | Main transmission case section |
| 4699301223 | HOUSING | Rear transmission housing adapter |
| 0636302022 | SCREW PLUG | Oil drain port sealing plug |
| 0501319149 | SCREW PLUG | Fill port sealing plug with O-ring |
| 0634801038 | SEALING RING | Copper crush washer for plug sealing |
| 0730365801 | TYPE PLATE | Identification plate for transmission model |
| 0501323165 | SHAFT SEAL | Input shaft oil seal |
| 0634303996 | O-RING | Cover-to-housing seal ring |
| 0630513060 | SNAP RING | Retaining ring for bearing assembly |
| 4699102116 | INPUT | Input shaft assembly |
