Overview
The ZF 0636.011.772 HEXAGON SCREW is a critical fastening component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures the differential housing assembly, ensuring precise clamping force to maintain gear alignment and torque transfer. As a hexagon-headed fastener, it withstands high shear loads and vibration within the transmission case. The SKU 0636.011.772 is specifically designed to match factory tolerances, preventing loosening during heavy-duty operation. This screw is often replaced alongside the 2093109003: DIFFERENTIAL and 2093209096: DIFFERENTIAL components during rebuilds.
Symptoms of Failure
- Transmission oil seepage at housing joints: A worn or stretched hexagon screw reduces clamping force, allowing gear oil to escape around the differential cover. This is a common “ZF transmission oil leak” issue.
- Audible gear rattle or whining during acceleration: Loose fasteners cause the 0750117075: TAPER ROLLER BEARING to shift, creating abnormal noise under load.
- Intermittent gear slipping in WG100/WG130 models: When the hexagon screw fails to secure the 2093309073: DIFF.HOUSING, gear engagement becomes unpredictable, leading to power loss.
- Vibration through the driveline: Uneven torque distribution from a compromised fastener causes noticeable shuddering, especially at highway speeds.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.011.772 |
| Head Type | Hexagon (Hex) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.05 kg (approx.) |
| OEM Reference | ZF 0636.011.772 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with WG180 and WG200 variants where the differential housing uses identical thread patterns. Always verify thread pitch and length against your existing hardware. For complete differential rebuilds, pair this screw with the 2093109003: DIFFERENTIAL and 2093209096: DIFFERENTIAL assemblies.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109003 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating differential gears |
| 2093209096 | DIFFERENTIAL | Secondary differential unit for WG series |
| 2093309073 | DIFF.HOUSING | Encloses differential gears and bearings |
| 0631100223 | SPRING PIN | Secures gear alignment within housing |
| 0730300820 | THRUST WASHER | Reduces axial friction on gears |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheel hubs |
| 5838300811 | THRUST WASHER | Prevents gear end-play in differential |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Drives the ring gear for torque multiplication |
Frequently Asked Questions
Q: Can I reuse the ZF 0636.011.772 hexagon screw after removal?
A: ZF recommends replacing this fastener with a new OEM part after any disassembly, as the thread-locking coating and tensile strength degrade with each torque cycle.
Q: What torque specification should I use for this screw?
A: For WG100/WG130 transmissions, tighten to 80 Nm (59 ft-lbs) with a final 90-degree angle turn. Always consult your service manual for exact values.
Q: Does this screw fit the WG200 transmission?
A: Yes, the 0636.011.772 is compatible with WG200 models, but verify thread engagement depth as housing thickness may vary between series.
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