Overview
The ZF 0636.101.303 CAP SCREW is a critical OEM genuine fastener engineered for the WG100, WG130, and WG131 transmission series. This cap screw secures the 4143101025 HOUSING and 4143301055 HOUSING assemblies within the transmission casing, ensuring proper clamping force and alignment of internal components. As part of the Springs & Fasteners category, SKU 0636.101.303 maintains structural integrity under high torque and thermal cycling conditions, preventing loosening that could lead to gear train misalignment or oil pathway obstruction.
Symptoms of Failure
- Transmission oil seepage at housing joints: A worn or stripped 0636.101.303 cap screw reduces clamping force, allowing transmission fluid to escape past the 4143298040 CASE gasket interface.
- Audible rattling or vibration during gear engagement: Loose fasteners cause the housing to shift slightly, producing metallic chatter under load.
- Intermittent gear slipping in WG100/WG130 units: Insufficient bolt tension allows the valve body or clutch pack housing to move, disrupting hydraulic pressure delivery.
- Difficulty maintaining torque specifications during rebuild: Repeated use or corrosion on the cap screw threads prevents achieving factory torque values, leading to premature fastener fatigue.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0636.101.303 |
| Type | Cap Screw (Hex Socket Head) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 30 mm (estimated) |
| Material | Alloy Steel, Zinc-Plated |
| Weight | 0.035 kg (estimated) |
| OEM Reference | ZF 0636.101.303 |
| Torque Spec | 45 Nm (factory recommendation) |
Compatibility
This OEM cap screw is specifically designed for ZF WG100, WG130, and WG131 transmissions. It is also commonly used in WG180 and WG200 series where identical housing bolt patterns are present. The 0636.101.303 interfaces directly with the 0631329135 SPRING PIN alignment dowels to ensure precise housing registration during assembly. Always verify thread pitch and length against your specific transmission model before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101025 | HOUSING | Main transmission housing casting |
| 4143301055 | HOUSING | Secondary housing for clutch pack |
| 4143298040 | CASE | Transmission case outer shell |
| 0631329135 | SPRING PIN | Alignment dowel for housing positioning |
| 0501337904 | SPEED SENSOR | Output shaft speed monitoring |
| 0636101024 | CAP SCREW | Alternate fastener for valve body |
| 4475280099 | SCREW PLUG | Oil gallery sealing plug |
| 0634303266 | O-RING | Housing joint seal |
| 0501200072 | VENT VALVE | Transmission pressure equalization |
| 4475280015 | SCREW PLUG | Drain port plug |
