Overview
The ZF 0636.104.185 CAP SCREW is a critical OEM genuine fastener engineered for the WG100, WG130, and WG131 transmission series. This high-tensile bolt secures the 4699101093: HOUSING assembly, ensuring the internal clutch and planetary gear sets remain properly torqued under extreme loads. Without this cap screw, the entire gear train can shift out of alignment, leading to catastrophic internal damage. The SKU 0636.104.185 is precision-machined to ZF’s exacting tolerances, making it a direct replacement for worn or stripped fasteners in heavy-duty industrial transmissions.
Symptoms of Failure
- Transmission fluid seepage at housing joints: A loose or fatigued cap screw allows the 4699301175: HOUSING to separate slightly, causing oil to weep from the mating surfaces.
- Audible clunking during gear engagement: When the cap screw loses clamping force, the 4699301041: COVER can shift, producing a metallic knock under load.
- Intermittent gear slippage under torque: Insufficient bolt tension allows the 0634303936: O-RING to deform, reducing hydraulic pressure to the clutch packs.
- Vibration at the bell housing: A broken or stretched cap screw creates uneven stress distribution, causing harmonic vibrations that accelerate bearing wear.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.104.185 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 45 mm |
| Head Type | Hexagon socket (Allen) |
| Material | Alloy steel, 10.9 grade |
| Surface Finish | Zinc-plated, yellow passivated |
| Weight | 0.035 kg |
| OEM Reference | ZF 0636.104.185 |
Compatibility
This cap screw is specifically validated for the ZF WG100, WG130, and WG131 series transmissions. It is also commonly used in the WG180 and WG200 models where the same housing bolt pattern applies. Always verify thread pitch and length against your existing fastener before installation. For complete housing sealing, pair this screw with the 0634303936: O-RING to prevent fluid bypass at the bolt boss.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101093 | HOUSING | Main transmission casing |
| 4699301175 | HOUSING | Intermediate housing section |
| 4699301041 | COVER | End cover for clutch access |
| 0634303936 | O-RING | Seals housing-to-cover interface |
| 0630513203 | SNAP RING | Retains bearing in housing bore |
| 0750110302 | SHAFT SEAL | Prevents output shaft leakage |
| 0630513073 | SNAP RING | Secures planetary gear stack |
| 0501319149 | SCREW PLUG | Closes oil gallery ports |
| 0636302022 | SCREW PLUG | Drain or fill port plug |
| 0634801038 | SEALING RING | Copper washer for plug sealing |
