Overview
The ZF 0636.102.023 CAP SCREW is a critical fastening component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures the housing assembly, ensuring precise clamping force to maintain internal gear alignment and hydraulic pressure integrity. As a high-tensile fastener, it prevents loosening under extreme vibration and thermal cycling. The SKU 0636.102.023 is directly interchangeable with original factory parts, making it essential for any rebuild or repair involving the main casing or bearing covers.
Symptoms of Failure
- Transmission fluid seepage at housing joints: When the cap screw loses torque, the seal between the 4699101046: HOUSING and the main case degrades, leading to visible oil weeping.
- Abnormal gear rattle or vibration: A loose or stripped 0636.102.023 allows the 4699301109: HOUSING to shift, causing misalignment and metallic noise during load changes.
- Intermittent gear slipping under torque: Insufficient clamping force from a worn cap screw can reduce bearing preload, resulting in momentary power loss during acceleration.
- Bearing cover movement: A failed cap screw may cause the 4699301017: BEARING COVER to shift, leading to premature wear of internal thrust washers.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0636.102.023 |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 35 mm (estimated) |
| Head Type | Hexagon socket, flanged |
| Material | Alloy steel, zinc-plated |
| Weight | 0.04 kg (estimated) |
| OEM Reference | ZF 0636.102.023 |
| Torque Spec | 45 Nm (factory recommendation) |
Compatibility
This cap screw is designed for ZF WG100, WG130, and WG131 series transmissions. It is also commonly used in WG180 and WG200 models where the same housing bolt pattern applies. Always verify thread pitch and length against your specific assembly. The 0636.102.023 works in conjunction with the 4699301085: COVER to seal the upper valve body area. For complete housing integrity, pair this fastener with the 0634303141: O-RING to prevent fluid bypass at the bolt interface.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101046 | HOUSING | Main casing for gear cluster |
| 4699301109 | HOUSING | Intermediate housing section |
| 4699301017 | BEARING COVER | Seals and preloads output bearing |
| 4699301085 | COVER | Top cover for valve body access |
| 4699301014 | THREAD PROTECTIVE SHIELD | Prevents thread damage during assembly |
| 0634303141 | O-RING | Seals bolt head to housing face |
| 0734307407 | PROTECTION CAP | Covers exposed threads on external ports |
| 0634309600 | SHAFT SEAL | Prevents oil leakage at rotating shafts |
| 0637885612 | BREATHER | Equalizes internal pressure |
| 0636101008 | CAP SCREW | Alternate fastener for different thread pitch |
