Overview
The ZF 0636.100.782 HEXAGON SCREW is a critical OEM fastening component engineered specifically for the WG100, WG130, and WG131 transmission series. This genuine part secures key internal assemblies within the differential housing, ensuring precise alignment and torque retention under heavy load. The SKU 0636.100.782 is a direct replacement for the original factory screw, maintaining the exact thread pitch and tensile strength required for reliable gear train operation. When paired with a CROWN WHEEL or a DIFFERENTIAL assembly, this hexagon screw prevents rotational play that can lead to premature wear.
Symptoms of Failure
- Oil seepage around the differential housing: A loosened or fatigued hexagon screw can compromise the seal between the DIFFERENTIAL HOUSING and the transmission case, allowing transmission fluid to escape.
- Audible clicking or knocking during gear engagement: When the 0636.100.782 screw loses clamping force, the DIFFERENTIAL components may shift, producing metallic noise under acceleration or deceleration.
- Vibration in the driveline at highway speeds: A failed fastener can cause the crown wheel to wobble, transmitting vibration through the axle shafts.
- Intermittent gear slipping under load: Insufficient screw tension allows the differential bevel gears to misalign, leading to momentary power loss during heavy pulling.
Technical Specifications
| Part Number | 0636.100.782 |
| Type | Hexagon Screw (Socket Head Cap Screw) |
| 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 0636.100.782 |
| Head Type | Hexagon (6-point) |
Compatibility
This hexagon screw is a factory-fit component for the ZF WG100, WG130, and WG131 transmission models. It is also commonly used in the WG180 and WG200 series where identical differential housing bolt patterns are employed. The 0636.100.782 is not interchangeable with standard metric bolts due to its specific shank length and hardened grade. Always verify thread engagement when replacing fasteners in the DIFFERENTIAL HOUSING assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2098109042 | DIFFERENTIAL | Distributes torque to axle shafts |
| 2098309011 | CROWN WHEEL | Transfers power from pinion to differential |
| 2099209001 | DIFFERENTIAL | Complete differential assembly for WG series |
| 2098309010 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 2098309009 | DIFFERENTIAL HOUSING | Alternative housing variant for WG130 |
| 2098309031 | AXLE BEVEL GEAR | Drives axle shaft rotation |
| 2098309030 | AXLE BEVEL GEAR | Matching bevel gear for opposite axle |
| 2098309032 | DIFFERENTIAL BEVEL GEAR | Allows speed difference between wheels |
| 12883200682 | THRUST WASHER | Reduces axial friction in differential |
| 0635332059 | BALL BEARING | Supports differential carrier rotation |
