Overview
The ZF 0501.210.157 PLUG is a critical sealing component engineered for the WG 98 Series transmission family. This OEM genuine part functions as a threaded closure within the transmission housing, preventing fluid egress and maintaining hydraulic pressure integrity. Positioned at key access points on the transmission casing, the 0501.210.157 plug ensures that lubricant remains contained during high-torque operations. When installed alongside the 4660101015: TRANSMISSION HOUSING, this plug forms a leak-proof seal that protects internal gear sets from contamination. The SKU 0501.210.157 is precision-machined to ZF’s exacting tolerances, guaranteeing a secure fit within the WG98 assembly.
Symptoms of Failure
- Transmission fluid seepage around the plug bore: A worn or damaged 0501.210.157 plug often causes visible oil drips beneath the vehicle, especially after prolonged operation. This “ZF transmission oil leak from plug” issue can lead to low fluid levels and overheating.
- Hydraulic pressure loss during gear engagement: When the plug fails to seal, the system loses backpressure, resulting in “WG98 transmission slipping under load” or delayed shifts.
- Contaminant ingress into the housing: A compromised plug allows dirt and moisture to enter, accelerating wear on bearings and clutches. This manifests as “grinding noise from ZF transmission housing” during acceleration.
- Corrosion around the plug seating area: Over time, a failing plug can cause electrolytic reactions, leading to pitting on the 4660301054: HOUSING II surface, requiring costly repairs.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0501.210.157 |
| 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 0501.210.157 |
| Sealing Method | Metal-to-metal with O-ring groove |
Compatibility
This plug is specifically designed for the ZF WG 98 Series, which includes the WG180, WG200, and WG250 transmission models. It is a direct replacement for the original equipment plug found in these heavy-duty powershift transmissions. The 0501.210.157 interfaces directly with the 0631306174: CYLINDRICAL PIN that aligns the housing sections, and it is often replaced concurrently with the 0769123894: TYPE PLATE during a full transmission rebuild. Always verify your transmission serial number against the WG98 parts catalog to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Main casing that encloses gear sets and shafts |
| 4660301054 | HOUSING II | Secondary housing section for clutch packs |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0769123894 | TYPE PLATE | Identification plate with transmission specs |
| 0750100022 | SCREW PLUG | Alternate sealing plug for drain/fill ports |
| 4660221029 | SUCTION TUBE | Oil pickup tube from pan to pump |
| 0634100317 | O-RING | Elastomeric seal for plug bore |
| 0636103273 | CAP SCREW | Fastener for housing retention |
| 0634306311 | O-RING | Secondary seal for hydraulic passages |
| 4660321029 | FIXING PLATE | Retainer for internal valve body |
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