Overview
The ZF 4475.280.046 SCREW PLUG is a critical sealing component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as a threaded closure within the transmission housing, preventing fluid leakage and maintaining internal pressure integrity. Positioned at key access points on the gearbox casing, the SKU 4475.280.046 ensures that lubricating oil remains contained while allowing for periodic maintenance access. When installed alongside the 5838300626: DIFFERENTIAL HOUSING, this screw plug forms a secure seal that protects internal components from contamination and debris ingress.
Symptoms of Failure
- Transmission oil seepage around the plug head: A worn or cross-threaded 4475.280.046 screw plug often results in visible oil weeping, leaving residue on the transmission exterior.
- Persistent low fluid levels without visible external damage: When the seal fails internally, the transmission may lose lubricant gradually, causing erratic shifting or delayed engagement.
- Metallic debris in the oil pan during changes: A compromised plug can allow fine metal particles from the 5838109012: DIFFERENTIAL assembly to escape, contaminating the fluid system.
- Whining noise from the differential area: Insufficient oil retention due to plug failure can lead to inadequate lubrication of the 0750117075: TAPER ROLLER BEARING, producing audible bearing distress.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4475.280.046 |
| Material | Case-hardened steel with zinc-nickel plating |
| Thread Size | M18 x 1.5 (estimated) |
| Overall Length | 22 mm |
| Head Diameter | 24 mm hex |
| Weight | 0.035 kg |
| OEM Reference | ZF 4475.280.046 |
| Sealing Method | Integrated O-ring groove |
Compatibility
This screw plug is specifically designed for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It is also compatible with the WG180 and WG200 series when used in auxiliary port locations. The 4475.280.046 interfaces directly with the 2093209023: DIFFERENTIAL assembly housing, ensuring a leak-proof connection. For optimal performance, always pair this plug with a new sealing washer during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109012 | DIFFERENTIAL | Distributes torque between axles |
| 0750117075 | TAPER ROLLER BEARING | Supports rotating differential shafts |
| 2093209023 | DIFFERENTIAL | Secondary torque distribution unit |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses differential gears and bearings |
| 0631329088 | SPRING PIN | Secures gear alignment within housing |
| 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 rotating parts |
Frequently Asked Questions
Q: Can the 4475.280.046 screw plug be reused after removal?
A: ZF recommends replacing this plug with a new OEM unit each time it is removed, as the sealing surface may deform during initial torquing. Reusing it risks oil seepage and contamination of the differential assembly.
Q: What torque specification should I use for installation?
A: For the 4475.280.046, apply 35 Nm (26 ft-lbs) of torque using a calibrated wrench. Over-tightening can crack the differential housing, while under-tightening leads to fluid loss.
Q: Is this plug compatible with synthetic transmission fluids?
A: Yes, the zinc-nickel plating on this OEM screw plug resists chemical degradation from synthetic oils, making it fully compatible with all ZF-approved lubricants for WG-series transmissions.
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Phone: +86 158 2286 3467 |
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