Overview
The ZF 0636.011.028 HEXAGON SCREW is a critical OEM genuine fastening component engineered for the WG260 transmission series and its closely related variants. This hexagon screw secures internal assemblies within the transmission housing, ensuring that gear clusters and differential components remain precisely torqued under high-load conditions. As an OEM genuine part, SKU 0636.011.028 guarantees exact metallurgical composition and thread pitch, preventing loosening that can lead to catastrophic gear misalignment. In the WG260, this screw is typically found anchoring the differential housing to the main casing, working in concert with the 2093309071: DIFF.HOUSING to maintain structural integrity.
Symptoms of Failure
- Transmission oil seepage around the housing bolts: When the hexagon screw fatigues or loosens, the seal between the differential housing and the main case breaks, causing slow but persistent oil leaks.
- Audible clunking during gear engagement: A worn or stripped screw allows micro-movement of the 2093109001: DIFFERENTIAL assembly, producing a metallic knock when torque is applied.
- Vibration at highway speeds: Loss of clamping force from a degraded hexagon screw leads to uneven load distribution across the 0750117075: TAPER ROLLER BEARING, resulting in driveline shudder.
- Difficulty shifting into gear: If the screw backs out partially, it can interfere with the 2093209095: DIFFERENTIAL rotation, creating resistance in the shift linkage.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0636.011.028 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.04 kg (approx.) |
| OEM Reference | ZF 0636.011.028 |
| Torque Spec | 45 Nm (factory recommendation) |
Compatibility
This hexagon screw is designed for the ZF WG series transmissions, specifically the WG 250, WG 251, WG 258, WG 260, WG 261, WG 308, and WG 311 series. It is also commonly used in the WG180 and WG200 models where the differential housing mounting pattern matches. Always verify thread pitch against your specific transmission variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109001 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation |
| 2093209095 | DIFFERENTIAL | Secondary differential unit |
| 2093309071 | DIFF.HOUSING | Encloses differential gears |
| 0631100223 | SPRING PIN | Locks gear positions |
| 0730300820 | THRUST WASHER | Reduces axial friction |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axles |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheels |
| 5838300811 | THRUST WASHER | Spacer for gear alignment |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Primary gear in differential |
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