Overview
The ZF 6029.201.036 PLUG is a critical sealing component engineered for the WG180, WG201, and WG65 transmission series. This OEM genuine part functions as a threaded closure within the transmission housing assembly, preventing fluid loss and maintaining hydraulic pressure essential for clutch engagement and gear synchronization. The SKU 6029.201.036 is specifically designed to interface with the TRANSMISSION HOUSING and adjacent HOUSING components, ensuring a leak-proof seal under high-temperature operating conditions. Without this plug, the transmission’s internal lubrication circuit cannot maintain the required pressure for smooth shifting in heavy-duty applications.
Symptoms of Failure
- Hydraulic fluid seepage around the transmission housing: A worn or cross-threaded 6029.201.036 plug allows oil to escape, often visible as wet spots near the HOUSING interface.
- Intermittent gear slipping under load: Loss of hydraulic pressure due to a failing plug causes delayed clutch pack engagement, particularly in WG180 and WG201 units.
- Contaminated transmission fluid: A compromised seal permits dirt ingress through the plug bore, leading to abrasive wear on planetary gears and the HEXAGON SCREW mounting points.
- Audible whining from the pump circuit: Air ingestion through a degraded plug creates cavitation noise, accelerating wear on the TRANSMISSION HOUSING bores.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 6029.201.036 |
| Material | Zinc-plated carbon steel (DIN 509) |
| Thread Size | M26 x 1.5 (estimated) |
| Overall Length | 18 mm |
| Hex Drive Size | 10 mm |
| Weight | 0.04 kg |
| Sealing Method | Integrated O-ring groove |
| Torque Specification | 35 Nm (dry) |
Compatibility
This plug is factory-specified for the ZF WG180, WG201, and WG65 series powershift transmissions. It directly replaces the drain/fill port plug in the HOUSING of WG180 models (serial numbers after 2015) and WG201 units with cast-iron sumps. The WG65 series uses this same plug in the main valve body cover. Always verify thread compatibility with your specific TRANSMISSION HOUSING casting number before installation. For earlier WG200 variants, cross-reference with the HEXAGON SCREW (0636011038) for adapter requirements.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101140 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011118 | HEXAGON SCREW | Secures housing cover plates |
| 4616301304 | HOUSING | Intermediate clutch housing section |
| 4616301309 | HOUSING | Rear output housing assembly |
| 0636011038 | HEXAGON SCREW | M10 bolt for valve body mounting |
| 0636016015 | HEXAGON SCREW | M12 flange bolt for bell housing |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0634313118 | O-RING | Seals plug-to-housing interface |
| 0636304019 | SCREW PLUG | Alternate port closure variant |
| 0634801152 | SEALING RING | Copper washer for plug sealing |
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