Overview
The ZF 0636.011.391 HEXAGON SCREW is a critical fastening component engineered specifically for the WG 200 series transmission assembly. This OEM genuine part secures the 4460115043: HOUSING to the main gearbox casing, ensuring precise alignment of internal shafts and bearing preload. Manufactured to ZF’s exacting tolerances, the hexagon screw (SKU 0636.011.391) withstands high torque loads and thermal cycling common in heavy-duty industrial applications. Its hexagonal head design allows for accurate torque application during installation, preventing over-tightening or stripping that could compromise transmission integrity.
Symptoms of Failure
- Transmission oil seepage at housing joint: A loose or fatigued hexagon screw can cause micro-gaps between the housing and transmission case, leading to gradual oil leaks around the mating surface.
- Abnormal gear rattle or vibration: When the screw loses clamping force, the 4469315012: AXLE DRIVE HOUSING may shift slightly, creating misalignment that produces audible gear chatter during load changes.
- Premature bearing wear noise: Insufficient screw tension allows axial play in the 0750117406: TAPER ROLLER BEARING, generating a low-frequency hum or growl that intensifies with speed.
- Torque converter shudder: A failing screw can destabilize the entire drivetrain assembly, causing intermittent shudder during torque converter lockup in WG200 transmissions.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.011.391 |
| Thread Size | M12 x 1.75 |
| Length | 45 mm |
| Head Type | Hexagon (17 mm socket) |
| Material | Alloy steel, 10.9 grade |
| Surface Finish | Zinc-plated, yellow passivated |
| Weight | 0.045 kg |
| OEM Reference | ZF 0636.011.391 |
| Torque Specification | 80 Nm + 90° angle |
Compatibility
This hexagon screw is a direct replacement for ZF WG180, WG200, and WG210 series transmissions. It is commonly used in bus, coach, and off-highway vehicle applications where the WG200 gearbox is installed. The screw interfaces with the 0750117802: TAPERED ROLLER BEARING retention system and must be paired with appropriate washers (such as 0730161317: WASHER) to achieve correct clamping load. Always verify thread pitch and length against your specific transmission variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4460115043 | HOUSING | Encloses gear sets and supports bearing bores |
| 4469315012 | AXLE DRIVE HOUSING | Houses differential and final drive gears |
| 0750117406 | TAPER ROLLER BEARING | Supports radial and axial shaft loads |
| 0750117802 | TAPERED ROLLER BEARING | Provides precise shaft alignment under load |
| 0734319337 | SHAFT SEAL | Prevents oil leakage at shaft exits |
| 0730161317 | WASHER | Distributes clamping load under screw head |
| 0730161451 | WASHER | Spacer for bearing preload adjustment |
| 0730161452 | WASHER | Thin shim for axial clearance control |
| 0730161453 | WASHER | Thick shim for housing alignment |
| 0730161340 | WASHER | Lock washer for vibration resistance |
