Overview
The ZF 4657.131.401 FILLER NOZZLE is a precision-engineered fluid delivery component designed for the WG160, WG190, and WG210 series transmissions. This OEM genuine part serves as the primary entry point for transmission oil, directing lubricant into the main housing assembly to ensure proper gear and bearing lubrication. Located at the upper interface of the TRANSMISSION HOUSING, this nozzle works in concert with the HOUS.FRONT SECT to maintain consistent oil flow under high-torque conditions. The SKU 4657.131.401 is manufactured to ZF’s exacting tolerances, guaranteeing a leak-free seal and optimal fluid dynamics throughout the transmission’s service life.
Symptoms of Failure
- External oil seepage at the filler neck: A worn or cracked nozzle allows transmission fluid to escape, often leaving visible drips beneath the vehicle during parking.
- Intermittent gear engagement hesitation: Insufficient oil delivery due to a clogged or deformed nozzle can cause delayed shifts, particularly in WG190 models under heavy load.
- Low fluid level warnings despite recent top-offs: A failing filler nozzle may not properly seat, leading to slow fluid loss that triggers dashboard alerts without visible puddles.
- Whining noise from the transmission pump: Reduced oil volume from a compromised nozzle forces the pump to cavitate, producing a high-pitched sound during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.131.401 |
| Material | Reinforced nylon with brass insert |
| Overall Length | 85 mm |
| Inlet Diameter | 22 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4657.131.401 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This filler nozzle is engineered for the ZF WG160, WG180, WG190, WG200, and WG210 series transmissions. It directly interfaces with the HOUSING REAR PART (part 4656201036) and the alternative HOUSING REAR PART (part 4472239179), making it suitable for both early and late production variants. Always verify the specific housing configuration before installation to ensure proper alignment with the oil gallery channels.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101031 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating components |
| 4656201075 | HOUS.FRONT SECT | Forward housing section that supports the input shaft and pump |
| 4656201036 | HOUSING REAR PART | Rear housing section that contains the output shaft and oil sump |
| 4472239179 | HOUSING REAR PART | Alternate rear housing variant for specific WG series builds |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing mating during assembly |
| 4656301148 | FIXING PLATE | Retaining plate that secures the filler nozzle in position |
| 0636100817 | CAP SCREW | M8 fastener for mounting the fixing plate to the housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter that prevents debris entry through the nozzle |
| 4656301017 | SCREEN SHEET | Alternate mesh filter with different micron rating for heavy-duty use |
| 0636100803 | CAP SCREW | M6 fastener for securing the screen sheet assembly |
Frequently Asked Questions
Q: Can I install the 4657.131.401 filler nozzle without removing the transmission?
A: Yes, in most WG160 and WG190 applications, the nozzle is accessible from the top of the housing after removing the air intake ducting. However, if the HOUS.FRONT SECT is obstructing access, partial removal of the front housing may be required.
Q: How often should the filler nozzle be replaced during transmission rebuilds?
A: ZF recommends replacing the nozzle (SKU 4657.131.401) every time the TRANSMISSION HOUSING is separated from the rear section, as the nylon material can become brittle with age and heat cycling.
Q: Does this part include the screen sheet or fixing plate?
A: No, the 4657.131.401 is the nozzle only. You will need to order the SCREEN SHEET (4656301016) and FIXING PLATE (4656301148) separately for a complete filler assembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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