Overview
The ZF 4644.230.047 COVER PLATE is a critical sealing and protective component designed for the WG 200 series of powershift transmissions. This OEM genuine part sits on the rear or intermediate housing section of the gearbox, acting as a barrier that contains transmission fluid and prevents contaminants from entering the internal clutch and gear assemblies. The SKU 4644.230.047 is precision-engineered to maintain correct oil pressure and structural integrity within the transmission casing. When installed correctly with the proper fasteners, this cover plate ensures that the TRANSMISSION HOUSING remains sealed under high-torque operating conditions.
Symptoms of Failure
- Hydraulic fluid seepage around the rear housing: A warped or cracked cover plate often leads to visible oil leaks at the mating surface, especially after thermal cycling.
- Erratic clutch engagement or delayed shifting: When the cover plate fails to maintain a proper seal, system pressure drops, causing gear slippage and hesitation during directional changes.
- Contaminated transmission fluid: A compromised seal allows dirt and moisture to enter through the housing joint, leading to accelerated wear on internal components.
- Visible vibration or abnormal noise from the bell housing area: A loose or fatigued cover plate can cause resonance, indicating that the HEXAGON SCREW fasteners have lost torque retention.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4644.230.047 |
| Material | Die-cast aluminum alloy (A356-T6) |
| Overall Dimensions (L x W x H) | 210 mm x 145 mm x 12 mm |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4644.230.047 |
| Surface Finish | Anodized, machined mating face |
| Fastener Torque Spec | 45 Nm (33 ft-lbs) with Loctite 242 |
Compatibility
This cover plate is engineered for the ZF WG 200 series, including the WG200, WG180, and WG150 variants used in industrial forklifts, reach stackers, and heavy-duty material handling equipment. It is also compatible with select ZF 4WG-200 and 6WG-200 transmissions where the rear housing configuration matches the bolt pattern of the OUTPUT FLANGE assembly. Always verify the housing casting number before installation. The plate interfaces directly with the DISCONNECTION mechanism on certain models, ensuring proper alignment of the shift linkage.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105414 | DISCONNECTION | Clutch disconnect mechanism for PTO engagement |
| 4644303409 | OUTPUT FLANGE | Driveshaft connection flange |
| 0636021083 | HEXAGON SCREW | M10 x 30 mm mounting bolt for cover plate |
| 4644101222 | TRANSMISSION HOUSING | Main gearbox casing (left-hand variant) |
| 4644301226 | TRANSMISSION HOUSING | Main gearbox casing (right-hand variant) |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment stud for housing assembly |
| 4644301298 | COVER PLATE | Alternate cover plate for WG180 series |
| 0634306525 | O-RING | Sealing ring for cover plate groove |
| 0636305026 | SCREW PLUG | Drain/fill port plug for housing |
