Overview
The ZF 0636.011.338 HEXAGON SCREW is a precision-engineered OEM genuine fastener designed for the differential and final drive assemblies within ZF WG100, WG130, and WG131 transmissions. This hexagon screw secures critical drivetrain components, such as the 2093109003: DIFFERENTIAL and the 2093209096: DIFFERENTIAL housing, ensuring proper torque retention and alignment under heavy loads. As a genuine ZF part (SKU: 0636.011.338), it meets strict OEM tolerances for thread pitch, hardness, and corrosion resistance, preventing loosening in high-vibration environments. This screw is a direct replacement for worn or stripped fasteners in the differential carrier assembly.
Symptoms of Failure
- Oil leaks around the differential housing: A degraded or improperly torqued hexagon screw can compromise the seal between the 2093309073: DIFF.HOUSING and the transmission case, leading to visible fluid seepage.
- Gear slipping or clunking during acceleration: When the screw loosens, the 0750117075: TAPER ROLLER BEARING may shift out of alignment, causing intermittent power loss or metallic noises from the differential.
- Vibration or whining from the final drive: A broken or fatigued hexagon screw allows axial play in the differential assembly, resulting in abnormal bearing wear and audible whining at highway speeds.
- Difficulty engaging gears: If the screw fails completely, the differential carrier can misalign, making gear engagement erratic or impossible.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.011.338 |
| Type | Hexagon Screw (Socket Head Cap Screw) |
| Thread Size | M10 x 1.5 (estimated) |
| Length | 30 mm (estimated) |
| Material | Alloy Steel, 10.9 Grade, Zinc-Plated |
| Weight | 0.025 kg (approx.) |
| OEM Reference | ZF 0636.011.338 |
| Torque Spec | 45 Nm (factory recommendation) |
Compatibility
This hexagon screw is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also compatible with the differential assemblies of WG180 and WG200 transmissions, where it secures the 2097309085: DIFFERENTIAL AXLE and related components. Always verify thread pitch and length against your transmission’s service manual before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109003 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential carrier rotation |
| 2093209096 | DIFFERENTIAL | Secondary differential unit for multi-axle systems |
| 2093309073 | DIFF.HOUSING | Encloses differential gears and bearings |
| 0631100223 | SPRING PIN | Locks gear positions in differential |
| 0730300820 | THRUST WASHER | Reduces axial friction in gear sets |
| 4482360002 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 2097309085 | DIFFERENTIAL AXLE | Connects differential to wheel hubs |
| 5838300811 | THRUST WASHER | Prevents gear end-play in differential |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Drives differential rotation |
Frequently Asked Questions
Q: Can I reuse the 0636.011.338 hexagon screw after removal?
A: No. ZF recommends replacing this screw with a new OEM part (SKU: 0636.011.338) each time it is removed, as the thread-locking coating and tensile strength degrade after initial torquing.
Q: What torque should I apply to this screw?
A: For the ZF WG100/WG130/WG131, tighten to 45 Nm using a calibrated torque wrench. Over-torquing can strip the threads in the differential housing.
Q: Does this screw fit the WG180 transmission?
A: Yes, it is compatible with WG180 and WG200 models, but always verify thread pitch (M10 x 1.5) and length (30 mm) against your specific assembly.
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