Overview
The ZF 0636.015.242 HEXAGON SCREW is a precision-engineered OEM fastening component designed specifically for the WG 65 series transmission. This genuine ZF part secures critical internal assemblies within the gearbox, ensuring that torque loads and vibrational stresses are evenly distributed across mating surfaces. As a hexagon-head bolt, it provides superior grip during installation and removal, reducing the risk of cam-out or thread damage. The SKU 0636.015.242 is manufactured to exact ZF tolerances, making it a direct replacement for worn or damaged fasteners in the WG65 planetary gear set. When paired with the 4616105402 OUTPUT shaft assembly, this screw maintains the structural integrity required for heavy-duty industrial applications.
Symptoms of Failure
- Transmission oil seepage at bolt heads: A loose or fatigued 0636.015.242 screw can compromise the seal between the 4616101119 TRANSMISSION HOUSING and the valve body, leading to visible oil weeping around the hexagon head.
- Abnormal gear engagement noise: When this hexagon screw loses clamping force, the 4005303005 OUTPUT FLANGE may shift slightly, producing a distinct clunking or grinding sound during gear changes.
- Vibration during power take-off: A stripped or stretched 0636.015.242 allows micro-movement in the planetary carrier, causing low-frequency vibration that intensifies under load.
- Intermittent gear slipping: If the screw backs out partially, the clutch pack clearance changes, resulting in momentary loss of torque transfer during acceleration.
Technical Specifications
| Specification | Value |
|---|---|
| Thread Size | M12 x 1.75 |
| Length | 45 mm |
| Head Type | Hexagon (ISO 4017) |
| Material | Steel 10.9 grade, zinc-plated |
| Weight | 0.042 kg |
| OEM Reference | 0636.015.242 |
| Torque Spec | 85 Nm (dry) |
Compatibility
This hexagon screw is a core fastener in the ZF WG 65 series, but its design also suits several other ZF off-highway transmissions. Compatible models include WG65, WG80, WG100, WG120, WG150, WG180, and WG200 series gearboxes. It is commonly used in the planetary carrier-to-output shaft connection. For related fastening solutions, consider the 0636011038 HEXAGON SCREW for similar applications in the WG80 series, or the 0636011118 HEXAGON SCREW for longer reach requirements.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers torque from planetary gear to driveline |
| 4005303005 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4616101119 | TRANSMISSION HOUSING | Encloses gear train and supports bearings |
| 0636011038 | HEXAGON SCREW | Secures valve body to housing (M10 variant) |
| 0636011118 | HEXAGON SCREW | Fastens clutch pack retainer (M12 x 50mm) |
| 0636016015 | HEXAGON SCREW | Mounts PTO adapter (M16 x 1.5) |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals screw bore against oil leakage |
| 0636304019 | SCREW PLUG | Closes unused threaded ports in housing |
| 0634801152 | SEALING RING | Prevents fluid bypass at flange joint |
