Overview
The ZF 0636.302.602 SCREW PLUG is an OEM genuine sealing component engineered for the WG90, WG94, and WG98 series transmissions. This precision-machined plug secures critical fluid passages within the transmission housing, preventing lubricant loss and maintaining hydraulic pressure. The SKU 0636.302.602 is installed directly into the 4660101015: TRANSMISSION HOUSING to seal off machining access ports. It works in tandem with the 4660301054: HOUSING II to ensure a leak-free assembly. Without this screw plug, the transmission cannot maintain proper oil levels, risking internal component damage.
Symptoms of Failure
- Oil leaks around the transmission housing: A worn or stripped 0636.302.602 plug allows transmission fluid to seep past the threads, leaving visible puddles under the vehicle.
- Low hydraulic pressure and gear slipping: When the screw plug fails to seal, pressure drops in the valve body, causing delayed engagement or slipping during acceleration.
- Contaminated fluid from external debris ingress: A compromised plug lets dirt and moisture enter through the housing opening, accelerating wear on internal components like the 0631306174: CYLINDRICAL PIN.
- Vibration or rattling noises: A loose screw plug can vibrate against the housing, producing a metallic rattle that worsens with engine RPM.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.302.602 |
| Material | Steel, zinc-plated |
| Thread Size | M18 x 1.5 |
| Overall Length | 22 mm |
| Hex Size | 17 mm (AF) |
| Weight | 0.04 kg |
| OEM Reference | ZF 0636.302.602 |
| Sealing Method | Metal-to-metal or O-ring (use 0634100317: O-RING if required) |
Compatibility
This screw plug is designed for ZF WG90, WG94, and WG98 series transmissions. It is also compatible with the WG180 and WG200 models where the same thread pattern is used for housing access ports. Always verify the thread pitch against your existing plug before installation. For related sealing needs, consider the 0750100022: SCREW PLUG for alternate port sizes, or the 4660221029: SUCTION TUBE which mounts nearby in the oil circuit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4660301054 | HOUSING II | Secondary housing cover for valve body |
| 0631306174 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0769123894 | TYPE PLATE | Identification plate for transmission model |
| 0750100022 | SCREW PLUG | Alternate plug for smaller ports |
| 4660221029 | SUCTION TUBE | Oil pickup tube from pan to pump |
| 0634100317 | O-RING | Seal for screw plug applications |
| 0636103273 | CAP SCREW | Fastener for housing covers |
| 0634306311 | O-RING | Secondary seal for hydraulic passages |
| 4660321029 | FIXING PLATE | Retainer for internal components |
