Overview
The ZF 0636.016.406 HEXAGON SCREW is a critical OEM genuine fastener engineered for secure assembly within the differential housing of WG100, WG130, and WG131 transmissions. This hexagon screw ensures that internal components remain precisely torqued under high-load conditions, preventing axial movement that can lead to gear misalignment. As a genuine ZF part, SKU 0636.016.406 meets strict factory tolerances for thread pitch and tensile strength, making it essential for any rebuild or repair of these heavy-duty transmission assemblies.
Symptoms of Failure
- Oil seepage around the differential housing: When the hexagon screw loosens or fatigues, the seal between the housing and the DIFFERENTIAL HOUSING can break, causing slow transmission fluid leaks.
- Intermittent gear slipping under load: A compromised hexagon screw allows the DIFFERENTIAL assembly to shift slightly, resulting in momentary power loss during acceleration.
- Unusual knocking or clunking from the transmission case: Excessive clearance from a loose fastener creates metal-on-metal contact between the DIFFERENTIAL and the TAPER ROLLER BEARING, producing audible noise.
- Vibration in the driveline at highway speeds: A failing hexagon screw permits rotational imbalance, which accelerates wear on surrounding fasteners and bearings.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.016.406 |
| Type | Hexagon Screw (Socket Head Cap Screw) |
| Thread Size | M16 x 1.5 (estimated) |
| Length | 40 mm (estimated) |
| Material | Alloy Steel, Grade 10.9 |
| Surface Finish | Zinc-Plated, Yellow Passivated |
| Weight | 0.08 kg (approx.) |
| OEM Reference | ZF 0636.016.406 |
| Torque Specification | 120 Nm (factory spec) |
Compatibility
This hexagon screw is specifically designed for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with certain variants of the WG180 and WG200 when used in the differential mounting point. Always verify thread pitch and length against your transmission’s service manual. For related fasteners, consider the SPRING PIN and THRUST WASHER for a complete rebuild.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation |
| 2093209023 | DIFFERENTIAL | Secondary differential assembly |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears |
| 0631329088 | SPRING PIN | Secures gear alignment |
| 5838300811 | THRUST WASHER | Reduces axial friction |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Drives wheel rotation |
| 5838300753 | THRUST WASHER | Controls side gear clearance |
| 5838300818 | THRUST WASHER | Adjusts pinion gear end play |
Frequently Asked Questions
Q: Can I reuse the 0636.016.406 hexagon screw after removal?
A: ZF recommends replacing this fastener with a new OEM part each time it is removed, as the thread-locking coating and torque retention degrade after initial installation.
Q: Does this screw fit the WG180 transmission?
A: Yes, it is compatible with WG180 models when used in the differential housing mounting location, but always cross-reference your transmission serial number.
Q: What tools are required for installation?
A: A hex key (Allen wrench) of the appropriate size and a torque wrench set to 120 Nm are required to avoid over-torquing the housing.
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Phone: +86 158 2286 3467 |
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