Overview
The ZF 0636.102.409 HEXAGON SCREW is a critical fastening component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures internal assemblies within the transmission housing, ensuring precise alignment of gear trains and load-bearing structures. The SKU 0636.102.409 is designed to withstand high torque and vibration loads, preventing loosening during heavy-duty operation. It sits in the fastener cluster that anchors the differential housing and axle components, making it indispensable for maintaining structural integrity under extreme stress.
Symptoms of Failure
- Transmission oil seepage at fastener points: A worn or stripped hexagon screw can compromise the seal between the housing and the DIFFERENTIAL HOUSING, leading to visible oil leaks around the bolt head.
- Gear engagement noise under load: When the screw loses clamping force, the DIFFERENTIAL assembly may shift, producing a distinct clunking or whining sound during acceleration or deceleration.
- Intermittent gear slipping in higher ranges: Loosening of the hexagon screw can cause misalignment of the TAPER ROLLER BEARING, resulting in unpredictable power delivery and hesitation during gear changes.
- Vibration through the driveline: A failing fastener allows micro-movement of the DIFFERENTIAL unit, transmitting noticeable vibrations to the chassis at highway speeds.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.102.409 |
| Thread Size | M12 x 1.5 |
| Length | 45 mm |
| Head Type | Hexagon (6-point) |
| Material | High-tensile alloy steel (10.9 grade) |
| Surface Treatment | Zinc-nickel plating (corrosion resistant) |
| Weight | 0.042 kg |
| OEM Reference | ZF 0636.102.409 |
| Torque Specification | 80 Nm + 90° angle |
Compatibility
This hexagon screw is OEM-specified for ZF WG100, WG130, and WG131 transmissions. It is also commonly used in the WG180 and WG200 series where similar fastener dimensions apply. The part is designed to secure components such as the DIFFERENTIAL HOUSING and axle assemblies. Always verify thread pitch and length against your transmission model before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating shafts under axial/radial loads |
| 2093209023 | DIFFERENTIAL | Alternative differential assembly for WG series |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures alignment of mating components |
| 5838300811 | THRUST WASHER | Reduces axial friction in gear sets |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Controls end-play in differential |
| 5838300818 | THRUST WASHER | Provides wear surface for bevel gears |
Frequently Asked Questions
Q: Can I reuse the ZF 0636.102.409 hexagon screw after removal?
A: No. This is a torque-to-yield fastener that should be replaced with a new OEM part each time it is removed to ensure proper clamping force and prevent failure.
Q: What tools are needed to install this screw?
A: A 12-point socket (18 mm) and a torque wrench capable of 80 Nm are required. An angle gauge is also necessary for the final 90° turn.
Q: Does this part fit the ZF WG180 transmission?
A: Yes, the 0636.102.409 is compatible with WG180 models, though always cross-reference your transmission serial number to confirm thread length and pitch.
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