Overview
The ZF 0636.011.104 HEXAGON SCREW is a critical OEM genuine fastener engineered for the differential and final drive assemblies of ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. This hexagon screw secures internal components such as the DIFF.HOUSING and associated gear sets, ensuring precise clamping force under high torque loads. As part of the Springs & Fasteners category, the SKU 0636.011.104 is designed to withstand extreme vibration and thermal cycling within the transmission housing. Its failure can compromise the integrity of the entire drivetrain assembly, making it a vital component for maintaining OEM performance standards.
Symptoms of Failure
- Oil leaks near the differential housing: A loose or fatigued hexagon screw can cause the DIFF.HOUSING seal to break, leading to visible fluid seepage around the transmission case.
- Gear slipping or clunking during acceleration: When the 0636.011.104 screw loses its clamping torque, the DIFFERENTIAL assembly may shift, causing intermittent power loss or metallic knocking sounds.
- Excessive play in the axle bevel gear: Worn fasteners allow the AXLE BEVEL GEAR to move axially, resulting in uneven gear wear and reduced transmission efficiency.
- Vibration at highway speeds: A compromised hexagon screw can unbalance the rotating assembly, transmitting harsh vibrations through the driveline.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.011.104 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Head Type | Hexagon (6-point) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 0.04 kg (approx.) |
| OEM Reference | ZF 0636.011.104 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is specifically engineered for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 series when used in differential mounting applications. The 0636.011.104 screw works in conjunction with the TAPER ROLLER BEARING and the DIFFERENTIAL assembly to ensure proper preload and alignment. For complete drivetrain restoration, verify fitment with your specific transmission serial number.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2095109015 | DIFFERENTIAL | Distributes torque to drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating differential shafts |
| 2095209037 | DIFFERENTIAL | Alternate differential assembly variant |
| 2095309059 | DIFF.HOUSING | Encloses differential gears and bearings |
| 0631329086 | SPRING PIN | Locks gear positions within differential |
| 0730300820 | THRUST WASHER | Reduces axial friction on gears |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2095309081 | DIFFERENTIAL AXLE | Connects differential to wheel hubs |
| 5838300811 | THRUST WASHER | Alternate thrust washer for gear support |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Primary gear for torque splitting |
