Overview
The ZF 0636.105.187 HEXAGON SCREW is a critical fastening component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures internal housing assemblies and maintains precise clamping force within the gearbox casing. As a high-tensile fastener, it prevents loosening under extreme torque and thermal cycling. The SKU 0636.105.187 is specifically designed to anchor the 4699101018: HOUSING and 4699301051: HOUSING assemblies, ensuring structural integrity during heavy-duty operations.
Symptoms of Failure
- Transmission oil seepage at bolt interfaces — A worn or stretched hexagon screw compromises the seal between the 4699301054: HOUSING COVER and the main casing, leading to gradual fluid loss.
- Abnormal gear engagement noise — When the screw loses preload, internal clearances shift, causing metallic rattling or grinding during gear changes.
- Vibration under load — Loose fasteners allow the 4699301055: COVER to micro-move, transmitting vibration through the driveline during acceleration.
- Torque converter shudder — In severe cases, fastener failure destabilizes the pump housing, producing a shudder at low RPM.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.105.187 |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Head Type | Hexagon (6-point) |
| Material | Alloy steel, zinc-plated |
| Tensile Strength | 10.9 grade (estimated) |
| Weight | 0.045 kg |
| OEM Reference | ZF 0636.105.187 |
Compatibility
This hexagon screw is validated for ZF WG100, WG130, and WG131 transmissions. It also fits select WG180 and WG200 variants where the same housing bolt pattern is used. Always cross-reference the part number 0636.105.187 with your transmission serial plate before installation. For related sealing components, consider the 0634303996: O-RING and 0634319161: SHAFT SEAL for complete assembly integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101018 | HOUSING | Main gear carrier enclosure |
| 4699301051 | HOUSING | Secondary housing section |
| 4699301054 | HOUSING COVER | Seals the housing assembly |
| 4699301055 | COVER | Protects internal components |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage |
| 0634303996 | O-RING | Fluid seal for bolt joints |
| 0734307408 | PROTECTION CAP | Dust cover for exposed threads |
| 0634319161 | SHAFT SEAL | Prevents oil leakage |
| 0630502032 | RETAINING RING | Secures bearing assemblies |
| 0637885612 | BREATHER | Equalizes internal pressure |
