Overview
The ZF 6029.201.043 PLUG (SKU: 6029.201.043) is a critical sealing component engineered for the WG150, WG200, WG201, and WG251 series transmissions. This OEM genuine part functions as a threaded or press-fit plug that seals fluid passages and access ports within the main transmission housing. It prevents pressurized oil from escaping the hydraulic control circuits and keeps contaminants out of the gear train. The plug is typically installed directly into the TRANSMISSION HOUSING or the TRANSMISSION HOUSING assembly, ensuring that the internal lubrication and cooling systems maintain proper pressure. Without this plug, the entire hydraulic system would lose integrity, leading to immediate operational failure.
Symptoms of Failure
- Hydraulic oil seepage around the housing port: A worn or cracked 6029.201.043 plug will allow transmission fluid to weep from the housing, leaving visible stains on the exterior of the gearbox.
- Erratic gear engagement or slipping: When this plug fails, the hydraulic circuit loses pressure, causing delayed shifts or complete loss of drive in specific ranges.
- Contaminated transmission fluid: A missing or loose plug allows dirt and moisture to enter the housing, leading to sludge buildup and accelerated wear on internal components.
- Audible air hissing during operation: A compromised seal can introduce air into the oil system, creating aeration noise and reducing lubrication efficiency.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 6029.201.043 |
| Material | Steel with zinc-plated finish |
| Thread Size | M14 x 1.5 (estimated) |
| Overall Length | 22 mm |
| Head Diameter | 18 mm |
| Weight | 0.04 kg |
| Seal Type | Integrated O-ring groove |
| OEM Reference | ZF 6029.201.043 |
Compatibility
This genuine ZF plug is designed for use in the following transmission models: WG150, WG180, WG200, WG201, WG251. It is commonly found in the main housing section where it seals oil galleries and test ports. When replacing this plug, technicians often also inspect the TYPE PLATE for correct model identification and verify the integrity of the GROOVED STUD that secures adjacent housing covers. For WG200 and WG201 series units, the plug is frequently paired with the shift system and cover plate assemblies.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Secondary housing section for valve body |
| 0730365125 | TYPE PLATE | Identification tag for transmission series |
| 0631311009 | GROOVED STUD | Alignment fastener for housing sections |
| 4642301168 | SCREEN SHEET | Oil filter mesh for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Fine filtration screen for valve body |
| 0636100621 | HEXAGON SCREW | Fastener for cover plate attachment |
| 4642301186 | SCREEN SHEET | Suction strainer for oil pump |
| 4644106300 | SHIFT SYSTEM | Hydraulic control unit for gear selection |
| 4644306500 | COVER PLATE | Sealing plate for housing access port |
