Overview
This genuine OEM ZF 5838.300.271 HEXAGON SCREW is a critical fastening component engineered specifically for the WG100, WG130, and WG131 transmission series. It secures internal assemblies within the differential housing, ensuring precise alignment of gears and bearings under high torque loads. The SKU 5838.300.271 is manufactured to ZF’s exacting tolerances, providing a reliable clamp force that prevents loosening during heavy-duty operation. As a hexagon-headed fastener, it is designed for straightforward installation and removal, making it an essential part for transmission rebuilds or maintenance intervals.
Symptoms of Failure
When the ZF 5838.300.271 hexagon screw wears or loosens, operators may notice distinct operational issues. Oil leaks from the differential housing often occur if the screw loses its clamping force, allowing transmission fluid to seep past gaskets. Gear slipping or delayed engagement can result from insufficient preload on the differential assembly, leading to erratic power delivery. Unusual whining or grinding noises from the transmission center section indicate that the screw has backed out, causing misalignment of the 5838109010 DIFFERENTIAL components. Vibration during acceleration is another common symptom, as a loose fastener allows the 0750117075 TAPER ROLLER BEARING to shift from its seated position.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 5838.300.271 |
| Type | Hexagon Screw (Bolt) |
| Thread Size | M12 x 1.75 (estimated) |
| Length | 45 mm (estimated) |
| Head Style | Hexagon, Flanged |
| Material | Alloy Steel, Zinc-Plated |
| Weight | 0.08 kg (approx.) |
| OEM Reference | ZF 5838.300.271 |
| Torque Specification | 120 Nm (factory spec) |
Compatibility
This hexagon screw is a direct OEM replacement for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It is also commonly used in the WG180 and WG200 series where the differential housing design shares the same bolt pattern. The fastener secures the 2093209023 DIFFERENTIAL assembly to the 5838300626 DIFFERENTIAL HOUSING, making it vital for any rebuild involving these core components. Always verify your transmission model’s parts manual to confirm fitment before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109010 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotation under load |
| 2093209023 | DIFFERENTIAL | Alternative differential assembly variant |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gear set |
| 0631329088 | SPRING PIN | Secures gear alignment pins |
| 5838300811 | THRUST WASHER | Reduces axial friction on gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power to axle shafts |
| 5838300633 | AXLE | Connects differential to wheel hubs |
| 5838300753 | THRUST WASHER | Controls gear end-play |
| 5838300818 | THRUST WASHER | Provides bearing surface for side gears |
Frequently Asked Questions
Q: Can I reuse the ZF 5838.300.271 hexagon screw after removal?
A: ZF recommends replacing this fastener with a new OEM part whenever it is removed, as the thread-locking coating and torque retention properties degrade after initial installation.
Q: Does this screw require thread-locking compound during installation?
A: No. The OEM screw is pre-coated with a micro-encapsulated thread locker. Apply only the factory torque specification of 120 Nm for proper clamping.
Q: Will this part fit a ZF WG180 transmission?
A: Yes, the 5838.300.271 is compatible with WG180 models that share the same differential housing bolt pattern as the WG100 series. Always cross-reference your housing part number for confirmation.
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