Overview
The ZF 0636.302.600 SCREW PLUG is a critical sealing component engineered for the WG200, WG92, and WG98 transmission series. This OEM genuine part functions as a threaded closure within the transmission housing, preventing fluid egress and maintaining hydraulic pressure integrity. The SKU 0636.302.600 is specifically designed to secure access points in the valve body or sump area, where it interfaces directly with the TRANSMISSION HOUSING to ensure a leak-proof seal under high-torque conditions. Its precision-machined threads and corrosion-resistant coating make it indispensable for long-term drivetrain reliability.
Symptoms of Failure
- Transmission fluid seepage around the plug: A worn or improperly torqued 0636.302.600 often results in visible oil drips beneath the vehicle, especially after prolonged operation.
- Erratic gear engagement or slipping: When this screw plug fails to seal, hydraulic pressure drops can cause delayed shifting or clutch chatter in WG200 series units.
- Contaminated fluid or air ingress: A compromised seal allows debris or air into the system, leading to foaming oil and reduced lubrication efficiency.
- Audible whining from the transmission: Low fluid levels due to a leaking plug may produce a high-pitched noise during gear changes, indicating cavitation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0636.302.600 |
| Thread Size | M18 x 1.5 (estimated) |
| Overall Length | 22 mm |
| Head Diameter | 24 mm |
| Material | Steel, zinc-plated |
| Weight | 0.04 kg |
| OEM Reference | ZF 0636.302.600 |
| Sealing Type | Metal-to-metal or O-ring assisted |
Compatibility
This screw plug is engineered for ZF’s heavy-duty off-highway transmissions. It is a direct fit for the WG 200 Series (including WG200, WG210), WG 92 Series (WG92, WG94), and WG 98 Series (WG98, WG100). It also applies to select variants of the WG180 and WG190 where the HOUSING design incorporates a M18 port. For installations involving the RANGE SELECTOR assembly, this plug seals the auxiliary pressure test port. Always verify thread pitch against your specific PERIPHERALS kit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306174 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0769123894 | TYPE PLATE | Identifies transmission model and serial number |
| 4660221012 | SUCTION TUBE | Draws fluid from sump to pump |
| 0634100317 | O-RING | Provides secondary seal for plug |
| 0636103273 | CAP SCREW | Secures valve body covers |
| 0750100022 | SCREW PLUG | Alternate plug for different port sizes |
