Overview
The ZF 5838.300.515 HEXAGON SCREW is a critical fastening component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part secures key internal assemblies, ensuring precise clamping force within the differential and gear train. The SKU 5838.300.515 is designed to withstand high torque loads and vibration, maintaining structural integrity during heavy-duty operations. It is commonly installed alongside the 5838109010: DIFFERENTIAL and the 5838300626: DIFFERENTIAL HOUSING to anchor rotating components.
Symptoms of Failure
- Oil seepage around bolt heads: A worn or loosened hexagon screw can compromise the seal between the differential housing and cover, leading to visible transmission fluid leaks during operation.
- Abnormal gear whine or clunking: When the 5838.300.515 loses its clamping torque, the 0750117075: TAPER ROLLER BEARING may shift, causing misalignment and audible noise under load.
- Intermittent gear slipping under acceleration: A fractured or stripped hexagon screw can allow the 2093209023: DIFFERENTIAL assembly to move, resulting in power loss or erratic engagement.
- Vibration in the driveline: Loose fasteners create play in the differential carrier, transmitting noticeable vibration through the chassis at highway speeds.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 5838.300.515 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Material | High-tensile steel, zinc-plated |
| Weight | 0.08 kg (approx.) |
| OEM Reference | ZF 5838.300.515 |
| Grade | 10.9 (estimated) |
Compatibility
This hexagon screw is primarily compatible with ZF WG100, WG130, and WG131 transmission models. It also fits select WG180 and WG200 variants where the differential housing uses identical bolt patterns. Always verify thread pitch and length against your specific unit. The 5838.300.515 is often replaced in sets when servicing the 5838300626: DIFFERENTIAL HOUSING or the 5838109010: DIFFERENTIAL assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109010 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating differential gears |
| 2093209023 | DIFFERENTIAL | Alternative differential assembly |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential components |
| 0631329088 | SPRING PIN | Secures gear alignment |
| 5838300811 | THRUST WASHER | Reduces axial friction |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axles |
| 5838300633 | AXLE | Connects differential to wheels |
| 5838300753 | THRUST WASHER | Controls gear end-play |
| 5838300818 | THRUST WASHER | Additional axial support |
Frequently Asked Questions
Q: Can I reuse the 5838.300.515 hexagon screw after removal?
A: ZF recommends replacing this bolt with a new OEM part each time it is removed, as torque-to-yield fasteners lose clamping force after initial installation.
Q: What torque specification should I use for this screw?
A: For WG100/WG130/WG131 transmissions, tighten the 5838.300.515 to 90 Nm (estimated) plus 90° turn. Always consult your service manual for exact values.
Q: Is this screw compatible with the WG180 differential housing?
A: Yes, the 5838.300.515 is used in WG180 models that share the same bolt pattern as the WG130, but verify thread length before installation.
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