Overview
The ZF 4651.306.100 COVER PLATE is a critical sealing and structural component designed exclusively for the WG 100 series transmission family. This OEM genuine part sits on the exterior of the transmission housing, providing a secure barrier that protects internal hydraulic circuits and rotating assemblies from contamination. By maintaining proper fluid retention and pressure integrity, the cover plate ensures consistent clutch engagement and smooth power delivery. The SKU 4651.306.100 is precision-engineered to match ZF’s exacting tolerances, making it a direct replacement for worn or damaged units in heavy-duty industrial drivetrains.
Symptoms of Failure
- External transmission fluid seepage around the cover plate perimeter: When the gasket surface degrades or the plate warps, oil leaks become visible, often leading to low fluid levels and erratic shifting.
- Increased gear slippage during load cycles: A compromised cover plate can reduce internal hydraulic pressure, causing clutches to slip under heavy torque demands.
- Contaminated transmission fluid due to debris ingress: Cracks or corrosion on the plate allow dirt and moisture to enter the gear train, accelerating wear on bearings and gears.
- Abnormal noise from the transmission housing: Loose or improperly seated cover plates can vibrate against the TRANSMISSION HOUSING, producing a distinct rattling sound during operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4651.306.100 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Overall Dimensions | 210 mm x 145 mm x 18 mm (estimated) |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4651.306.100 (Genuine) |
| Mounting Bolt Torque | 25 N·m (18.4 lb-ft) |
| Sealing Surface Finish | Ra 0.8 µm |
Compatibility
This cover plate is primarily engineered for the ZF WG 100 series, but its mounting pattern and sealing geometry also suit several adjacent models. Verified compatibility includes the WG180, WG200, and WG250 transmissions used in construction loaders, agricultural tractors, and material handling equipment. The part interfaces directly with the HOUSING (part 4651301034) and requires a fresh O-RING (part 0634303928) during installation to guarantee a leak-free seal. For complete assembly, it also mates with the HOUSING (part 4651301013) on the opposite side of the gear cluster.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101006 | TRANSMISSION HOUSING | Main structural casing that encloses all gear and clutch assemblies |
| 4651301034 | HOUSING | Intermediate housing section supporting bearing journals and oil passages |
| 0634303928 | O-RING | Elastomeric seal preventing fluid leakage between mating surfaces |
| 4651301013 | HOUSING | Rear housing component that houses the output shaft and speed sensors |
| 4651301015 | SCREEN SHEET | Fine mesh filter protecting hydraulic valves from particulate debris |
| 4651301035 | SCREEN SHEET | Secondary filter element for high-pressure oil return circuits |
| 0630361028 | SEALING CAP | Plugs unused ports to maintain internal pressure and prevent leaks |
| 4475280060 | SCREW PLUG | Threaded closure for drain or inspection openings in the housing |
| 0634303312 | O-RING | Small-diameter seal for screw plug and sensor mounting points |
| 0630361063 | SEALING CAP | High-temperature cap for breather vents and test ports |
