Overview
The ZF 0636.305.009 SCREW PLUG is a critical sealing component designed for the WG201 and WG65 transmission series. This OEM genuine part functions as a threaded closure within the transmission housing, preventing fluid loss and maintaining internal pressure integrity. The SKU 0636.305.009 is engineered to withstand high thermal cycles and vibration loads, ensuring a secure seal at the drain or fill ports. When installed alongside the TRANSMISSION HOUSING, this screw plug provides a leak-proof interface that supports optimal lubrication flow.
Symptoms of Failure
- Persistent oil leaks around the transmission pan: A worn or stripped 0636.305.009 screw plug often causes visible drips at the lowest point of the WG201 assembly, leading to low fluid levels.
- Gear slipping under load: When the plug fails to seal, pressure loss in the hydraulic circuit can cause erratic shifting or delayed engagement in WG65 transmissions.
- Contaminated transmission fluid: A compromised seal allows dirt and moisture ingress, resulting in dark, gritty fluid that accelerates wear on internal components like the OUTPUT shaft.
- Audible whining or grinding noises: Insufficient lubrication from a leaking plug leads to metal-on-metal contact, particularly near the OUTPUT FLANGE.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 0636.305.009 |
| Material | Steel with zinc-nickel coating |
| Thread Size | M18 x 1.5 |
| Overall Length | 22 mm |
| Head Diameter | 24 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 0636.305.009 |
| Sealing Type | Integrated O-ring groove |
Compatibility
This screw plug is specifically engineered for ZF WG 200 Series, WG 201 Series, and WG 65 Series transmissions. It directly replaces the factory-installed plug in models such as WG180, WG200, WG201, and WG65. The 0636.305.009 also fits auxiliary ports on the HEXAGON SCREW mounting points. For complete assembly integrity, verify thread compatibility with your transmission housing before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105415 | OUTPUT | Transfers torque from transmission to driveshaft |
| 4616303144 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4616101094 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 0636011038 | HEXAGON SCREW | Fastens housing cover to main body |
| 0636011118 | HEXAGON SCREW | Secures valve body to housing |
| 0636016015 | HEXAGON SCREW | Mounts oil pan to transmission |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals plug-to-housing interface |
| 0732611049 | FILTER INSERT | Traps debris in hydraulic circuit |
| 0634303718 | O-RING | Seals output flange connection |
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