Overview
The ZF 4651.364.033 VALVE HOUSING is a critical hydraulic control component engineered for the WG100 and WG201 series transmissions. This OEM genuine part, identified by SKU 4651.364.033, serves as the central manifold that directs pressurized oil flow to actuate clutch packs and modulate shift timing. Positioned within the transmission’s valve body assembly, it precisely routes fluid through integrated channels to ensure smooth gear engagement. When paired with a robust TRANSMISSION HOUSING (4644101160), this valve housing maintains the structural integrity required for high-torque industrial applications.
Symptoms of Failure
- Erratic or delayed gear engagement: Worn internal bores cause pressure loss, leading to harsh or slipping shifts during acceleration.
- External hydraulic fluid seepage: Cracks or porosity in the casting allow oil to escape, often visible around the valve body mating surfaces.
- Intermittent transmission overheating: Restricted oil passages from debris or corrosion reduce cooling flow, triggering thermal warnings.
- Persistent neutral condition: A failed valve housing can prevent line pressure from reaching clutches, leaving the transmission unable to engage any forward or reverse gear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4651.364.033 |
| Material | High-grade aluminum alloy (die-cast) |
| Weight | 2.85 kg (6.28 lbs) |
| Length | 320 mm |
| Width | 180 mm |
| Height | 95 mm |
| OEM Reference | ZF 4651.364.033 |
| Sealing Surface Finish | Ra 0.8 µm |
Compatibility
This valve housing is specifically designed for the ZF WG100 and ZF WG201 transmission families. It is also compatible with select variants of the WG180, WG200, and WG210 series where the valve body configuration matches. For a complete rebuild, ensure the TRANSMISSION HOUSING (4644301323) is inspected for wear. Additionally, the THREADED BUSH (4644301189) and SCREW PLUG (4475280043) are often replaced concurrently to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301323 | TRANSMISSION HOUSING | Secondary housing for valve body support |
| 4644301189 | THREADED BUSH | Provides wear-resistant thread for mounting bolts |
| 4475280043 | SCREW PLUG | Seals oil passages during pressure testing |
| 0634306198 | O-RING | Prevents fluid leaks at housing joints |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 4644301161 | COVER PLATE | Protects valve body from debris ingress |
| 0636100621 | HEXAGON SCREW | Fastens valve housing to transmission case |
| 0631610020 | SET SCREW | Locks adjustment sleeves in position |
| 0501218540 | BREATHER | Equalizes internal pressure and vents moisture |
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