Overview
The ZF 4657.131.021 FILLER NOZZLE is a precision-engineered fluid delivery component designed specifically for the WG190 and WG210 transmission series. This OEM genuine part serves as the primary interface for directing transmission fluid into the torque converter and hydraulic control circuits. Positioned within the front section of the transmission housing, the filler nozzle ensures a consistent, aerated-free flow of oil during operation. The SKU 4657.131.021 is manufactured to ZF’s exacting tolerances, guaranteeing a secure fit and optimal fluid dynamics. When paired with the HOUS.FRONT SECT (4657201161), this nozzle completes the critical fluid pathway that protects internal components from wear.
Symptoms of Failure
- Transmission fluid leaks at the front housing: A worn or cracked filler nozzle often causes visible oil seepage around the bell housing area, leading to low fluid levels and potential overheating.
- Erratic gear engagement or slipping: When the nozzle fails to deliver adequate fluid pressure, you may experience delayed shifts or clutch slip, especially under load.
- Whining or cavitation noise from the pump: A damaged nozzle allows air to enter the fluid stream, producing a high-pitched whine during acceleration or at idle.
- Burning smell or discolored fluid: Restricted flow from a clogged nozzle causes localized overheating, resulting in dark, burnt-smelling transmission oil.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.131.021 |
| Material | Hardened steel with zinc plating |
| Overall Length | 68 mm |
| Outer Diameter | 22 mm |
| Internal Orifice | 8 mm |
| Weight | 0.12 kg |
| OEM Reference | ZF 4657.131.021 |
| Sealing Surface | Ground finish, 32 Ra |
Compatibility
This filler nozzle is engineered for ZF’s WG-series powershift transmissions, specifically the WG190 and WG210 models. It is also compatible with the WG180 and WG200 series when used in conjunction with the correct O-RING (0634313603) and CYLINDRICAL PIN (0631306816). The nozzle fits all standard WG front housing assemblies, including those found in agricultural tractors, construction loaders, and industrial material handlers. For proper installation, always replace the 螺栓 (0636115293) to ensure correct torque retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657201161 | HOUS.FRONT SECT | Front housing section that encloses the filler nozzle |
| 0636115293 | 螺栓 | Mounting bolt for nozzle retention |
| 0634313603 | O-RING | Seals the nozzle-to-housing interface |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for nozzle positioning |
| 0636100801 | CAP SCREW | Secures the nozzle assembly |
| 4656301148 | FIXING PLATE | Locks the nozzle in position |
| 4657301032 | SCREEN SHEET | Primary fluid filtration element |
| 4657301033 | SCREEN SHEET | Secondary fine-mesh filter |
| 0636100803 | CAP SCREW | Fastener for screen sheet retention |
| 4656301047 | OIL FEED.HOUSG. | Oil feed housing for lubrication circuit |
