Overview
The ZF 4657.131.016 FILLER NOZZLE is a precision-engineered component designed for the WG190 and WG210 series transmissions. This OEM genuine part serves as the primary fluid entry point, directing transmission oil into the main sump with controlled flow to prevent aeration and ensure proper lubrication of internal gears and clutches. Positioned on the upper housing assembly, the filler nozzle integrates directly with the TRANSMISSION HOUSING to create a sealed channel for oil delivery. The SKU 4657.131.016 is manufactured to ZF’s exacting tolerances, guaranteeing a secure fit and reliable fluid management under high-pressure operating conditions.
Symptoms of Failure
When the ZF 4657.131.016 filler nozzle deteriorates, operators may notice specific performance issues. Transmission oil leaks around the filler neck are a primary indicator, often presenting as drips or wet spots on the housing exterior. Gear engagement hesitation or slipping can occur due to insufficient fluid reaching the valve body, as the nozzle’s degraded seal allows air to mix with the oil. Erratic shift timing is another common symptom, where the transmission struggles to maintain consistent pressure. Additionally, visible cracks or deformation on the nozzle body itself may be detected during routine inspections, leading to contamination of the hydraulic circuit.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.131.016 |
| Material | Reinforced Nylon / Aluminum Alloy |
| Weight | 0.15 kg (0.33 lbs) |
| Length | 85 mm |
| Inlet Diameter | 22 mm |
| OEM Reference | ZF 4657.131.016 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This filler nozzle is engineered for ZF’s WG series transmissions, specifically the WG190 and WG210 models. It also fits the WG180 and WG200 variants due to shared housing architecture. The part interfaces directly with the HOUS.FRONT SECT and the HOUSING REAR PART, ensuring proper alignment with the oil gallery. For complete assembly, the HOUSING REAR SECTION must also be correctly positioned to avoid fluid bypass. Always verify your transmission model’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101079 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201169 | HOUSING REAR PART | Rear housing component for output support |
| 4657298104 | HOUSING REAR SECTION | Extended rear section for additional gear sets |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing positioning |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Mounting bracket for nozzle retention |
| 4657301032 | SCREEN SHEET | Filter mesh for oil inlet protection |
| 4657301033 | SCREEN SHEET | Secondary filter for fine debris capture |
| 0636100803 | CAP SCREW | High-torque fastener for housing joints |
Frequently Asked Questions
Q: Can the 4657.131.016 filler nozzle be replaced without removing the transmission?
A: Yes, in most WG190 and WG210 installations, the nozzle is accessible from the top of the housing after draining the oil and removing the filler neck cover. However, always consult your service manual for specific clearance requirements.
Q: What causes premature wear on this filler nozzle?
A: Common causes include overtightening during installation, exposure to contaminated oil with abrasive particles, or thermal cycling that degrades the sealing surface. Regular inspection of the SCREEN SHEET can help prevent debris-related damage.
Q: Is the ZF 4657.131.016 compatible with aftermarket housings?
A: This nozzle is designed exclusively for OEM ZF housings. Using it with non-OEM components like the TRANSMISSION HOUSING may result in improper sealing and fluid bypass.
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