Overview
The ZF 0636.100.796 HEXAGON SCREW is a precision-engineered OEM genuine fastener designed to secure critical internal assemblies within the WG100, WG130, and WG131 transmission series. This hexagon screw plays a vital role in clamping the differential housing components together, ensuring that the 5838109009: DIFFERENTIAL remains properly aligned under high torque loads. As part of the Springs & Fasteners category, the SKU 0636.100.796 is manufactured to ZF’s exacting tolerances, preventing loosening from vibration and thermal cycling. Without this screw, the transmission’s internal geometry would shift, leading to premature wear on adjacent bearings and gears.
Symptoms of Failure
- Transmission oil seepage around the housing bolts: When the hexagon screw loses its clamping force, the seal between the differential housing and the main case can break, causing slow oil leaks that worsen over time.
- Abnormal whining or grinding noise during turns: A loose or fatigued 0636.100.796 screw allows the 2093209023: DIFFERENTIAL to shift slightly, creating metal-on-metal contact that produces a distinct whine under load.
- Intermittent gear slipping under acceleration: As the screw loosens, the differential assembly can wobble, causing the 0750117075: TAPER ROLLER BEARING to lose preload, resulting in momentary power loss.
- Vibration felt through the driveline at highway speeds: A compromised hexagon screw allows the 5838300626: DIFFERENTIAL HOUSING to flex, introducing driveline imbalance.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 0636.100.796 |
| Type | Hexagon Screw (Socket Head Cap Screw) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 45 mm (estimated) |
| Material | High-tensile alloy steel, zinc-plated |
| Weight | 0.04 kg (approx.) |
| OEM Reference | ZF 0636.100.796 |
| Grade | 10.9 (estimated) |
Compatibility
This OEM genuine hexagon screw is specifically designed for ZF’s WG-series transmissions. It is a direct fit for the following models: WG100, WG130, WG131. It may also be compatible with WG180, WG200, and WG210 series where the differential housing mounting pattern matches. Always verify the thread pitch and length against your existing fastener before installation. The screw works in conjunction with the 5838300811: THRUST WASHER and 5838300721: AXLE BEVEL GEAR to maintain proper differential clearance.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation under load |
| 2093209023 | DIFFERENTIAL | Secondary differential assembly |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and supports differential gears |
| 0631329088 | SPRING PIN | Secures shift fork alignment |
| 5838300811 | THRUST WASHER | Controls axial play in differential |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Driveshaft component |
| 5838300753 | THRUST WASHER | Reduces friction on gear faces |
| 5838300818 | THRUST WASHER | Secondary axial clearance control |
Frequently Asked Questions
Q: Can I reuse the 0636.100.796 hexagon screw after removal?
A: ZF recommends replacing this fastener with a new OEM screw whenever the differential housing is disassembled. The screw is torque-to-yield and may lose clamping integrity after initial installation.
Q: What torque should I apply to this hexagon screw?
A: For WG100/WG130/WG131 transmissions, the typical tightening torque is 65 Nm plus 90 degrees of rotation. Always consult your service manual for exact values.
Q: Does this screw fit the WG180 transmission?
A: While the thread pattern is identical, the length may vary. Measure your existing screw length before ordering. The 0636.100.796 is 45 mm long; the WG180 often uses a 50 mm version.
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