Overview
The ZF 0636.015.028 HEXAGON SCREW is a critical fastening component engineered for secure assembly within ZF WG100, WG130, and WG131 transmission systems. This OEM genuine part functions as a primary retention element, clamping transmission housings and covers to maintain structural integrity under high torque and thermal stress. The SKU 0636.015.028 is specifically designed to withstand vibration and fluid pressure, ensuring that adjacent assemblies like the 2094101012: TRANSMISSION HOUSING and 2094301036: HOUSING remain precisely aligned during operation. Without this hexagon screw, the transmission’s internal components cannot maintain proper sealing or load distribution.
Symptoms of Failure
- Transmission fluid seepage at housing joints – When the 0636.015.028 hexagon screw loses clamping force, oil can escape between the 2094298057: HOUSING and mating surfaces, leading to visible drips or wet spots under the vehicle.
- Gear engagement hesitation or slipping – A loosened or fatigued hexagon screw allows micro-movement in the 2094301071: COVER, disrupting gear alignment and causing delayed shifts or unexpected disengagement under load.
- Abnormal vibration or rattling from transmission casing – Worn threads or stripped heads on this fastener create play between housing sections, producing audible metallic noises during acceleration or deceleration.
- Increased operating temperature due to fluid loss – Progressive failure of the hexagon screw reduces sealing integrity, leading to low fluid levels and overheating in the WG100/WG130/WG131 series.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.015.028 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 28 mm (estimated) |
| Head Type | Hexagon, Flanged |
| Material | High-Tensile Steel, Zinc-Plated |
| Weight | Approx. 0.04 kg |
| OEM Reference | ZF 0636.015.028 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is engineered for ZF off-highway and industrial transmissions, specifically the WG100, WG130, and WG131 series. It is also compatible with the WG180 and WG200 models where similar housing fastening patterns are used. The 0636.015.028 is a direct replacement for original equipment fasteners in these gearboxes, ensuring proper torque retention when paired with 0750111371: SHAFT SEAL and 0634303085: O-RING for complete sealing integrity. Always verify thread pitch and length against your specific transmission assembly before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101012 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 2094301036 | HOUSING | Secondary housing for clutch assembly |
| 2094298057 | HOUSING | Intermediate housing for bearing support |
| 2094301071 | COVER | Sealing cover for access port |
| 0750111371 | SHAFT SEAL | Prevents fluid leakage at rotating shafts |
| 0634303085 | O-RING | Static seal for housing interfaces |
| 2094301030 | GASKET | Flange gasket for oil-tight joints |
| 0631306670 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0636011356 | HEXAGON SCREW | Alternate fastener for similar applications |
| 4475280060 | SCREW PLUG | Sealing plug for fluid drain ports |
