Overview
The ZF 0659.050.100 PLUG is a critical sealing component engineered for the WG150, WG200, and WG201 transmission series. This OEM genuine part serves as a positive seal within the transmission housing, preventing fluid bypass and maintaining hydraulic pressure integrity. Positioned in the lower valve body or sump area, the plug works in concert with the TRANSMISSION HOUSING to ensure a leak-free environment. The SKU 0659.050.100 is precision-machined to factory tolerances, making it a direct replacement for worn or damaged plugs in ZF powershift transmissions.
Symptoms of Failure
- External oil seepage around the plug bore: When the 0659.050.100 plug loses its interference fit, transmission fluid may weep from the housing joint, leaving visible drips on the bell housing or under the vehicle.
- Erratic gear engagement or delayed shifts: A failing plug can cause internal pressure loss, leading to soft shifts or hesitation when moving from neutral to drive or reverse.
- Low transmission fluid level without visible external leaks: Internal bypass past a degraded plug can allow fluid to migrate into the torque converter cavity, causing unexplained fluid consumption and potential overheating.
- Whining or cavitation noise from the sump: Air ingestion through a compromised plug seal can aerate the hydraulic fluid, producing a high-pitched whine during operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 0659.050.100 |
| Material | Steel with zinc-nickel plating |
| Overall Diameter | 18.0 mm |
| Overall Length | 12.5 mm |
| Weight | 0.015 kg |
| OEM Reference | ZF 0659.050.100 |
| Seal Type | Interference fit with O-ring groove |
| Torque Specification | Hand-tighten + 15° (no thread) |
Compatibility
This genuine ZF plug is specifically designed for the following transmission models: WG150, WG200, WG201, WG251, and WG65 series. It is commonly used in the sump plug location and the valve body cover. When replacing this plug, always inspect the mating bore in the TRANSMISSION HOUSING for scoring or burrs. The installation typically requires the use of HEXAGON SCREW fasteners (M8 x 20) for adjacent covers, while the plug itself is press-fit. For secure mounting of the valve body, the HEXAGON SCREW (M10 x 30) and HEXAGON SCREW (M12 x 35) are also used in the same assembly area.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011038 | HEXAGON SCREW | M8 fastener for cover plates |
| 0636011118 | HEXAGON SCREW | M10 fastener for valve body |
| 0636016015 | HEXAGON SCREW | M12 fastener for pump housing |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0634313118 | O-RING | Seal for plug bore interface |
| 0636304019 | SCREW PLUG | Threaded drain plug for sump |
| 0634801152 | SEALING RING | Copper washer for screw plug |
| 0732611049 | FILTER INSERT | Hydraulic fluid filtration element |
| 0634303718 | O-RING | Seal for filter housing cover |
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