Overview
The ZF 0636.101.490 CAP SCREW is a critical fastening component designed specifically for the WG 200 Series transmission. This OEM genuine part secures the TRANSMISSION HOUSING assembly, ensuring precise clamping force to maintain internal hydraulic pressure and gear alignment. Positioned within the main casing, this cap screw prevents fluid migration and structural vibration during high-torque operations. The SKU 0636.101.490 is engineered to ZF’s exacting tolerances, making it a direct replacement for worn or damaged fasteners in the WG200 platform.
Symptoms of Failure
- Transmission fluid seepage around housing joints: A degraded cap screw loses clamping integrity, allowing ATF to escape past gaskets, often visible as wet spots near the bell housing.
- Audible rattling or knocking from the gearbox: Loose fasteners cause the DISCONNECTION assembly to shift, producing metallic noise during gear changes.
- Intermittent gear slippage under load: Insufficient bolt tension reduces housing rigidity, leading to misalignment of the OUTPUT FLANGE and erratic power delivery.
- Increased vibration at highway speeds: A failing cap screw destabilizes the HEXAGON SCREW pattern, causing driveline shudder that worsens over time.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.101.490 |
| Material | High-tensile alloy steel, zinc-plated |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm |
| Head Type | Hexagon socket, 8 mm drive |
| Weight | 0.045 kg |
| OEM Reference | ZF 0636.101.490 |
| Torque Specification | 45 Nm (dry) |
Compatibility
This cap screw is primarily validated for the ZF WG200 series transmissions, including models WG180, WG200, and WG210. It also fits select variants of the Ecomat 4HP and 5HP series where the housing bolt pattern matches. Always verify thread pitch and length against your specific transmission’s service manual. The 0636.101.490 is often replaced in pairs with the TRANSMISSION HOUSING gasket kit to ensure a leak-free seal.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Isolates torque converter from driveline |
| 4644303538 | OUTPUT FLANGE | Connects transmission to driveshaft |
| 0636021036 | HEXAGON SCREW | Secures valve body and shift components |
| 4644101224 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4644301346 | TRANSMISSION HOUSING | Alternative housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification tag with serial number |
| 4644106300 | SHIFT SYSTEM | Controls clutch pack engagement |
| 4644306500 | COVER PLATE | Seals access to shift mechanism |
| 4644159311 | SHIFT SYSTEM | Secondary shift actuator assembly |
| 4644306563 | VALVE BLOCK | Distributes hydraulic pressure |
