Overview
The ZF 4475.280.150 SCREW PLUG is a precision-engineered sealing component designed to secure fluid passages and housing ports within ZF WG-series transmissions. This OEM genuine part, identified by SKU 4475.280.150, sits in the lower valve body and differential housing interface, where it prevents pressurized oil from escaping the lubrication circuit. As a critical fastener in the Springs & Fasteners category, this screw plug maintains the integrity of the hydraulic system that controls clutch engagement and gear shifts. When installed alongside a 2093109002: DIFFERENTIAL, it ensures that the differential assembly receives consistent oil flow without contamination.
Symptoms of Failure
- Oil seepage around the transmission housing – A worn or loose 4475.280.150 screw plug allows transmission fluid to weep past the threads, leaving visible stains on the bell housing or differential cover.
- Low hydraulic pressure and delayed gear engagement – When this plug fails to seal, the system loses pressure, causing sluggish shifts or hesitation when moving from neutral to drive.
- Contaminated differential oil – A compromised screw plug permits debris or moisture to enter the differential cavity, accelerating wear on the 0750117075: TAPER ROLLER BEARING and other rotating elements.
- Whining noise from the differential area – As fluid levels drop due to plug failure, the 2093209095: DIFFERENTIAL components run dry, producing a high-pitched whine during operation.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4475.280.150 |
| Thread Size | M18 x 1.5 |
| Overall Length | 22 mm |
| Head Type | Hex socket (8 mm) |
| Material | Steel, zinc-plated |
| Sealing Method | Copper washer (integrated) |
| Weight | 0.04 kg |
| OEM Reference | ZF 4475.280.150 |
Compatibility
This screw plug is engineered for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It also fits the WG180 and WG200 variants where the differential housing uses an M18 port. The plug is a direct replacement for the OEM part in these units, working in concert with the 2093309071: DIFF.HOUSING to maintain a sealed environment. Always verify thread pitch and port depth before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093109002 | DIFFERENTIAL | Distributes torque to axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports differential rotational loads |
| 2093209095 | DIFFERENTIAL | Secondary differential assembly |
| 2093309071 | DIFF.HOUSING | Encloses differential gears |
| 0631100223 | SPRING PIN | Secures shift fork position |
| 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 | Controls gear end-play |
| 4482360001 | DIFFERENTIAL BEVEL GEAR | Drives differential rotation |
Frequently Asked Questions
Q: Can I reuse the ZF 4475.280.150 screw plug after removal?
A: No. The integrated copper washer deforms during initial torque to create a seal. Reusing the plug risks leaks and pressure loss. Always install a new OEM plug.
Q: What torque should I apply to this screw plug?
A: For WG100/WG130/WG131 transmissions, tighten the 4475.280.150 to 35 Nm (26 ft-lb). Over-torquing can crack the differential housing.
Q: Does this plug work with synthetic transmission fluids?
A: Yes. The zinc-plated steel construction is compatible with all Dexron and ZF-approved synthetic oils used in WG-series transmissions.
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Phone: +86 158 2286 3467 |
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