Overview
This genuine ZF 4656.231.006 FILLER NOZZLE is a precision-engineered component designed for the lubrication and cooling circuits within the WG115, WG160, and WG210 transmission series. Positioned at the upper casing interface, this nozzle directs a controlled stream of transmission fluid onto the gear train and clutch packs, ensuring optimal thermal regulation and friction surface protection. As an OEM part, the 4656.231.006 guarantees the exact flow rate and spray pattern required for reliable operation. This filler nozzle works in concert with the 4656101031: TRANSMISSION HOUSING to maintain proper fluid distribution under load.
Symptoms of Failure
- Audible gear whine or clutch chatter: A worn or clogged filler nozzle reduces lubrication to the planetary gears, causing metallic noise during acceleration or deceleration.
- Transmission overheating: Inadequate oil spray from a degraded 4656.231.006 leads to localized hot spots, triggering thermal alarms or fluid breakdown.
- Erratic shift quality or slipping: Insufficient lubrication at the clutch packs causes delayed engagement or momentary power loss, especially under heavy torque.
- Visible oil seepage near the housing joint: A cracked or loose filler nozzle can allow fluid to escape around the 4656201075: HOUS.FRONT SECT interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4656.231.006 |
| Material | Brass with corrosion-resistant coating |
| Overall Length | 42 mm |
| Thread Size | M10 x 1.5 |
| Weight | 0.035 kg |
| OEM Reference | ZF 4656.231.006 |
| Flow Rate (nominal) | 1.2 L/min at 3 bar |
Compatibility
This filler nozzle is engineered for ZF WG-series powershift transmissions. It is a direct fit for the WG115, WG160, and WG210 series. Additionally, it is compatible with the WG180 and WG200 models when used in conjunction with the correct 4656201036: HOUSING REAR PART or the 4472239179: HOUSING REAR PART. Always verify your transmission’s serial number against the OEM parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101031 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train |
| 4656201075 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4656201036 | HOUSING REAR PART | Rear housing section for WG series |
| 4472239179 | HOUSING REAR PART | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 4656301148 | FIXING PLATE | Secures the nozzle in position |
| 0636100817 | CAP SCREW | Fastener for housing sections |
| 4656301016 | SCREEN SHEET | Filter screen for oil inlet |
| 4656301017 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Bolt for fixing plate attachment |
Frequently Asked Questions
Q: Can I install the 4656.231.006 without removing the transmission from the vehicle?
A: Yes, in most WG115 and WG160 applications, the filler nozzle is accessible after removing the lower pan or side cover. However, always consult the service manual for your specific model to avoid interference with the HOUS.FRONT SECT.
Q: How often should this filler nozzle be replaced?
A: ZF recommends inspecting the nozzle during major transmission overhauls or whenever the TRANSMISSION HOUSING is removed. Replace it if the orifice shows wear, deformation, or clogging from debris.
Q: Will a damaged nozzle cause low oil pressure codes?
A: Yes, a cracked or blocked 4656.231.006 can disrupt the lubrication circuit, leading to pressure drops that trigger diagnostic trouble codes in electronic WG210 systems.
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