Overview
The ZF 0636.105.226 HEXAGON SCREW is a precision-engineered OEM genuine fastener designed for critical clamping applications within the WG100, WG130, and WG131 transmission assemblies. This hexagon screw secures key housing components, ensuring proper alignment and sealing under high-torque operating conditions. As a genuine ZF part, SKU 0636.105.226 meets exacting factory tolerances to prevent loosening from vibration. It is typically installed alongside the 4699101046 HOUSING and the 4699301109 HOUSING, forming a secure structural bond that maintains gear train stability.
Symptoms of Failure
- Transmission oil seepage around bolt heads: A worn or stripped hexagon screw loses clamping force, allowing fluid to escape past the 4699301017 BEARING COVER interface.
- Abnormal gear rattle or whine: Loose fasteners permit micro-movement between the housing and 4699301085 COVER, generating audible noise during load shifts.
- Recurring bolt loosening after retorque: Thread deformation from fatigue prevents the screw from holding specified torque, leading to repeated service intervals.
- Visible corrosion or thread galling: Exposure to hot transmission fluid degrades the screw surface, causing binding during removal or installation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.105.226 |
| Type | Hexagon Screw (Socket Head Cap) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Material | Alloy Steel, 10.9 Grade |
| Surface Finish | Zinc-Nickel Plated |
| Weight | 0.035 kg (approx.) |
| OEM Reference | ZF 0636.105.226 |
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 housing-to-cover fastening points. The screw interfaces directly with the 4699301014 THREAD PROTECTIVE SHIELD and the 0634303141 O-RING to create a sealed joint. For complete assembly, pair it with the 0734307407 PROTECTION CAP and the 0634309600 SHAFT SEAL to prevent contamination ingress.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101046 | HOUSING | Main transmission casing component |
| 4699301109 | HOUSING | Secondary housing for gear support |
| 4699301017 | BEARING COVER | Seals and retains bearing assembly |
| 4699301085 | COVER | Protective cover for internal components |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during installation |
| 0634303141 | O-RING | Creates fluid-tight seal at joint |
| 0734307407 | PROTECTION CAP | Covers exposed fastener ends |
| 0634309600 | SHAFT SEAL | Prevents oil leakage along rotating shafts |
| 0637885612 | BREATHER | Equalizes internal pressure |
| 0636102023 | CAP SCREW | Alternative fastener for cover attachment |
