Overview
The ZF 4616.336.015 PLUG is a critical sealing component engineered specifically for the WG 65 series of heavy-duty automatic transmissions. This OEM genuine part functions as a threaded closure within the transmission housing, preventing fluid loss and blocking contaminant ingress at key access points. The SKU 4616.336.015 is precision-machined to maintain exacting tolerances, ensuring a secure seal against high-pressure hydraulic circuits. When installed correctly alongside a TRANSMISSION HOUSING, this plug stabilizes internal pressure and safeguards the valve body assembly from debris.
Symptoms of Failure
- Hydraulic fluid seepage around the plug threads: A worn or cross-threaded 4616.336.015 plug often causes slow oil weeping, leaving visible residue on the transmission casing.
- Intermittent gear engagement hesitation: When the plug fails to seal, air enters the hydraulic circuit, leading to delayed clutch pack application and erratic shifting behavior.
- Contaminated transmission oil: A compromised plug allows fine metallic particles or moisture to bypass the filter, accelerating internal wear on planetary gearsets.
- Audible whistling or pressure loss: A loose or cracked plug can produce a high-pitched sound under load, indicating a loss of system pressure that affects torque converter lockup.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.336.015 |
| 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 4616.336.015 |
| Sealing Method | Integrated O-ring groove |
Compatibility
This plug is a direct-fit component for the ZF WG 65 transmission series, which includes models such as WG180, WG200, and WG210 used in off-highway vehicles and industrial machinery. It also applies to the WG 65 variants found in ZF Ecomat and Ecolife drivelines. For proper installation, always pair the 4616.336.015 with a HEXAGON SCREW for adjacent mounting points, and verify torque specifications using a HEXAGON SCREW of matching grade. In high-vibration applications, a HEXAGON SCREW with locking patch is recommended for the surrounding flange.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011038 | HEXAGON SCREW | Fastener for housing cover |
| 0636011118 | HEXAGON SCREW | Mounting bolt for valve body |
| 0636016015 | HEXAGON SCREW | High-torque flange fastener |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0634313118 | O-RING | Static seal for plug groove |
| 0636304019 | SCREW PLUG | Alternative port closure |
| 0634801152 | SEALING RING | Copper washer for plug base |
| 0732611049 | FILTER INSERT | Hydraulic fluid filtration element |
| 0634303718 | O-RING | Secondary seal for filter housing |
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