Overview
The ZF 0636.100.393 HEXAGON SCREW is a critical OEM genuine fastener engineered for the differential and final drive assemblies within the WG100, WG130, and WG131 transmission series. This high-tensile hexagon screw secures key rotating components, ensuring precise clamping force and structural integrity under extreme torque loads. As a genuine ZF part, SKU 0636.100.393 guarantees exact thread pitch and material hardness to prevent loosening during heavy-duty operation. It is commonly installed alongside the 5838109012: DIFFERENTIAL and the 5838300626: DIFFERENTIAL HOUSING to maintain proper gear alignment and load distribution.
Symptoms of Failure
- Oil leaks around the differential housing: A worn or stretched hexagon screw can compromise the seal between the DIFFERENTIAL HOUSING and the transmission case, allowing lubricant to seep out.
- Gear slipping or clunking during acceleration: When the 0636.100.393 screw loses its clamping torque, the DIFFERENTIAL assembly may shift, causing intermittent gear engagement and audible knocking.
- Excessive vibration from the final drive: A loose hexagon screw permits micro-movement of the 0750117075: TAPER ROLLER BEARING, leading to uneven bearing wear and driveline shudder.
- Premature bearing failure: Without proper screw tension, the 2093209023: DIFFERENTIAL components experience axial play, accelerating wear on thrust washers and bearings.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.100.393 |
| Type | Hexagon Screw (Socket Head Cap Screw) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 0.035 kg (approx.) |
| OEM Reference | ZF 0636.100.393 |
| Torque Specification | 45 Nm (factory spec) |
Compatibility
This genuine ZF hexagon screw is specifically designed for the following transmission models: WG100, WG130, and WG131. It is also compatible with select variants of the WG180 and WG200 series that share the same differential housing bolt pattern. Always verify your transmission serial number before ordering. The 0636.100.393 screw is a direct replacement for the original factory fastener and should be used with a new 5838300811: THRUST WASHER to ensure proper preload.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque to drive axles |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation |
| 2093209023 | DIFFERENTIAL | Secondary differential assembly |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears |
| 0631329088 | SPRING PIN | Secures shift mechanism |
| 5838300811 | THRUST WASHER | Reduces axial friction |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axles |
| 5838300633 | AXLE | Drives wheel hubs |
| 5838300753 | THRUST WASHER | Controls gear end-play |
| 5838300818 | THRUST WASHER | Bearing preload adjustment |
Frequently Asked Questions
Q: Can I reuse the 0636.100.393 hexagon screw after removal?
No. ZF recommends replacing this screw with a new OEM genuine part every time it is removed, as the thread-locking coating and torque yield are single-use. Reusing it risks fastener fatigue and differential housing leaks.
Q: What torque should I apply to this hexagon screw?
The factory specification is 45 Nm (33 ft-lbs) with a 90-degree angle-tightening step. Always consult the ZF service manual for your specific WG100/WG130/WG131 transmission to confirm.
Q: Does this screw fit the WG180 transmission?
Yes, the 0636.100.393 is compatible with WG180 and WG200 series transmissions that use the same differential housing bolt pattern. Verify your housing part number against the 5838300626: DIFFERENTIAL HOUSING to ensure fitment.
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