Overview
The ZF 4661.301.062 NOZZLE is a precision-engineered fluid metering component designed for the lubrication and cooling circuits within ZF WG90 and WG94 series transmissions. This OEM genuine part, identified by SKU 4661.301.062, directs pressurized oil to critical bearing surfaces and gear meshes, ensuring optimal thermal management and reducing friction during high-torque operations. It installs directly into the main valve body or housing assembly, working in conjunction with the 4661101001: TRANSMISSION HOUSING to maintain consistent oil flow. Without this nozzle, internal components risk accelerated wear from inadequate lubrication.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: A worn or clogged nozzle disrupts hydraulic pressure, causing sluggish clutch pack application.
- Transmission overheating under load: Reduced oil flow to the cooler circuit leads to elevated sump temperatures, often triggering warning lights.
- Audible whining or grinding from the gear train: Insufficient lubrication at the nozzle outlet creates metal-on-metal contact, producing high-pitched noises.
- Visible oil seepage around the housing joint: Cracks in the nozzle body or degraded sealing surfaces allow fluid to escape, leaving residue on the 4661301007: HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4661.301.062 |
| Material | Hardened steel with anti-corrosion coating |
| Overall Length | 38.5 mm |
| Outer Diameter | 14.2 mm |
| Orifice Diameter | 1.8 mm |
| Weight | 22 grams |
| OEM Reference | 4661.301.062 (ZF genuine) |
| Thread Type | M12 x 1.5 |
| Operating Pressure | Up to 18 bar |
| Temperature Range | -40°C to +120°C |
Compatibility
This nozzle is specifically calibrated for the WG90 and WG94 transmission series, which are commonly found in heavy-duty commercial vehicles and off-highway equipment. It also fits select variants of the WG180 and WG200 models where the lubrication circuit uses identical orifice sizing. Always verify the oil gallery configuration in your transmission; the nozzle interfaces directly with the 4661301093: TUBE and is secured by a 0631306174: CYLINDRICAL PIN to prevent rotation during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101001 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301007 | HOUSING | Secondary housing for valve body and oil passages |
| 4661301093 | TUBE | Oil delivery conduit from pump to nozzle |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for nozzle positioning |
| 0769123894 | TYPE PLATE | Identification tag for transmission model |
| 0750100022 | SCREW PLUG | Seals unused oil ports in the housing |
| 0636302602 | SCREW PLUG | Drain or fill port closure |
| 0634100633 | O-RING | Hydraulic seal for nozzle-to-housing interface |
| 4661301029 | NOZZLE | Alternate flow-rate nozzle for WG94 variants |
| 4661301027 | NOZZLE | High-flow nozzle for WG200 applications |
