Overview
The ZF 5838.300.305 SET SCREW is a precision-engineered OEM fastening component designed for the differential and planetary gear assemblies within ZF WG100, WG130, and WG131 transmissions. This set screw secures critical alignment of internal shafts and housings, preventing rotational play that can lead to premature wear. As a genuine OEM part, the SKU 5838.300.305 ensures exact thread pitch and hardness specifications required for high-torque industrial applications. It is commonly installed alongside the 5838109021: DIFFERENTIAL to maintain proper gear mesh and load distribution.
Symptoms of Failure
When the 5838.300.305 set screw loosens or fatigues, operators may notice these specific failure indicators:
- Intermittent gear slipping under load – The set screw’s inability to maintain clamping force allows the 0750117075: TAPER ROLLER BEARING to shift, causing momentary loss of torque transfer.
- Oil seepage from the differential housing – A loose set screw can distort sealing surfaces, leading to fluid migration past the 0631329086: SPRING PIN and adjacent gaskets.
- Abnormal vibration during deceleration – Worn threads or stripped heads allow axial movement of the 2095209019: DIFFERENTIAL assembly, creating harmonic resonance.
- Metallic debris in transmission fluid – Fretting corrosion from a loose set screw generates fine steel particles that contaminate the oil system.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 5838.300.305 |
| Thread Size | M10 x 1.5 (estimated) |
| Overall Length | 25 mm |
| Head Type | Hex socket (Allen) |
| Material | Case-hardened alloy steel (40Cr) |
| Surface Treatment | Zinc-nickel plating (corrosion resistant) |
| Weight | 0.018 kg |
| OEM Reference | ZF 5838.300.305 |
| Torque Specification | 45 N·m (with thread locker) |
Compatibility
This set screw is engineered for the following ZF transmission models: WG100, WG130, WG131, and by extension the WG180 and WG200 series when used in differential carrier retention applications. It is not compatible with WG210 or later electronic-shift variants without adapter kits. Always verify thread engagement depth when replacing the 5838300682: DIFFERENTIAL AXLE to avoid bottoming out.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109021 | DIFFERENTIAL | Distributes torque between output shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on differential |
| 2095209019 | DIFFERENTIAL | Alternate differential assembly for WG130 |
| 0631329086 | SPRING PIN | Secures shift fork alignment |
| 5838300817 | THRUST WASHER | Reduces axial friction in planetary gears |
| 5838300682 | DIFFERENTIAL AXLE | Carrier shaft for differential gears |
| 5838300811 | THRUST WASHER | Spacer for differential side gears |
| 5841302064 | THRUST WASHER | High-load washer for output shaft |
| 5838300812 | SEALING RING | Prevents fluid leakage at housing joint |
| 5838300137 | OUTER CLUTCH DISK | Friction surface for clutch pack engagement |
