Overview
The ZF 0636.101.439 CAP SCREW is a critical OEM genuine fastener engineered specifically for the WG100, WG130, and WG131 transmission series. This cap screw secures the 4699101181: HOUSING assembly, ensuring proper clamping force and alignment of internal components. Positioned within the transmission’s main casing, it prevents axial movement of the gear train and maintains oil-tight integrity. The SKU 0636.101.439 is precision-machined to ZF’s exacting tolerances, making it indispensable for rebuilds and preventive maintenance.
Symptoms of Failure
- Transmission oil seepage at housing joints: A loose or fatigued cap screw allows fluid to escape past the 0634303936: O-RING, leading to low lubricant levels and overheating.
- Audible knocking or rattle from the bell housing: Worn threads cause the 4699301191: HOUSING to shift under load, creating metal-on-metal contact.
- Intermittent gear engagement hesitation: Loss of clamping force misaligns the 4699301041: COVER, disrupting hydraulic pressure to clutch packs.
- Visible corrosion or stripped hex head: Over-torquing or environmental exposure compromises the fastener’s ability to hold torque, risking catastrophic failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.101.439 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 35 mm |
| Head Type | Hexagon (flanged) |
| Material | Steel, zinc-plated |
| Weight | 0.025 kg |
| OEM Reference | ZF 0636.101.439 |
| Torque Spec | 45 N·m (dry) |
Compatibility
This cap screw is designed for ZF WG100, WG130, and WG131 series transmissions. It also fits select WG180 and WG200 variants when used with the corresponding 0630513203: SNAP RING and 0750110302: SHAFT SEAL. Always verify thread pitch and length against your specific housing bore. For WG200 builds, pair with 0630513073: SNAP RING to secure the output shaft.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101181 | HOUSING | Main transmission casing |
| 4699301191 | HOUSING | Rear housing section |
| 4699301041 | COVER | Clutch access cover |
| 0634303936 | O-RING | Housing seal |
| 0630513203 | SNAP RING | Bearing retention |
| 0750110302 | SHAFT SEAL | Output shaft seal |
| 0630513073 | SNAP RING | Planetary carrier lock |
| 0501319149 | SCREW PLUG | Oil drain port |
| 0636302013 | SCREW PLUG | Pressure test port |
| 0634801038 | SEALING RING | Copper crush washer |
