Overview
The ZF 4660.306.171 NOZZLE is a precision-engineered fluid metering component designed for the lubrication and cooling circuits within ZF WG92 and WG98 series transmissions. This OEM genuine part ensures correct oil flow to critical bearing and gear interfaces, directly influencing thermal management and component longevity. The SKU 4660.306.171 is installed within the valve body or housing gallery, where it restricts and directs transmission fluid under pressure. Without this nozzle, the hydraulic balance of the transmission is compromised, leading to inadequate lubrication of high-load zones. It is a small but vital element in the overall oil distribution network, working in concert with the TRANSMISSION HOUSING and the HOUSING II to maintain proper fluid pathways.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: A worn or clogged nozzle disrupts hydraulic pressure, causing hesitation when selecting forward or reverse gears.
- Localized transmission overheating: Insufficient oil flow from a degraded nozzle leads to hot spots, often detected by thermal sensors or external temperature rise near the housing.
- Whining or humming noise from the transmission: Starved bearings due to reduced lubrication produce audible metallic sounds, especially under load.
- Visible oil seepage around the valve body area: A cracked nozzle can allow fluid to bypass seals, resulting in drips or wet spots on the CYLINDRICAL PIN or adjacent mating surfaces.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.306.171 |
| Material | Hardened steel with corrosion-resistant coating |
| Overall Length | 28.5 mm (estimated) |
| Outer Diameter | 12.0 mm (estimated) |
| Orifice Diameter | 1.8 mm (calibrated) |
| Weight | 0.015 kg |
| OEM Reference | ZF 4660.306.171 |
| Thread Type | M10 x 1.0 (estimated) |
Compatibility
This nozzle is engineered for the ZF WG92 and WG98 series transmissions, which are commonly found in medium-duty commercial vehicles and industrial machinery. Based on its design and function, it is also compatible with the following ZF models that share the same hydraulic architecture: WG180, WG200, and WG210. It is a direct replacement for the original factory-installed part and must be paired with the correct SCREW PLUG and O-RING to ensure a leak-free seal. Always verify fitment by cross-referencing your transmission serial number against the TYPE PLATE.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4660301054 | HOUSING II | Secondary housing for valve body and oil passages |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission serial number |
| 0750100022 | SCREW PLUG | Seals oil gallery access ports |
| 4660221029 | SUCTION TUBE | Draws oil from pan to pump inlet |
| 0634100317 | O-RING | Static seal for housing joints |
| 0636103273 | CAP SCREW | Fastener for housing attachment |
| 0634306311 | O-RING | Seal for nozzle or plug interfaces |
| 4660321029 | FIXING PLATE | Retains components within valve body |
