Overview
This genuine OEM ZF 4657.306.101 DUCT PLATE is a precision-engineered internal component designed specifically for the WG190 transmission series, with cross-compatibility across the BP 210, BP 230, WG 210, and WG 230 series. The duct plate functions as a critical fluid routing guide within the transmission housing, directing pressurized oil flow to the clutch packs and planetary gear sets for proper lubrication and cooling. Positioned between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, this SKU 4657.306.101 ensures that hydraulic circuits remain isolated and pressurized, preventing cross-contamination between lubrication and control circuits. Without this duct plate, the transmission cannot maintain the precise oil flow required for smooth gear engagement and thermal management.
Symptoms of Failure
- Delayed or harsh shifting under load: When the duct plate warps or cracks, oil pressure drops to specific clutch packs, causing noticeable hesitation or jerky engagement during acceleration.
- Transmission overheating with low oil pressure warnings: A compromised duct plate disrupts oil routing to the cooler circuit, leading to elevated sump temperatures and dashboard warning lights.
- Oil leaks at the housing joint: Wear or corrosion on the duct plate mating surface allows transmission fluid to seep past the HOUSING REAR PART seal, leaving visible drips under the vehicle.
- Intermittent gear slippage in higher ranges: Insufficient lubrication to the planetary gears due to blocked duct passages causes momentary loss of torque transfer, especially in 4th and 5th gears.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4657.306.101 |
| Material | High-strength aluminum alloy with corrosion-resistant coating |
| Overall Dimensions | 210 mm x 85 mm x 12 mm |
| Weight | 0.45 kg (1.0 lb) |
| OEM Reference | ZF 4657.306.101 (Genuine) |
| Mounting Holes | 6x M8 threaded bores |
| Operating Temperature Range | -40°C to +150°C |
Compatibility
This duct plate is a direct fit for the ZF WG190 series and is also compatible with the WG180, WG200, WG210, and WG230 transmissions when used with the correct CYLINDRICAL PIN alignment kit. It integrates seamlessly with the BP 210 and BP 230 series as a replacement part. Always verify that the mating surfaces on the TRANSMISSION HOUSING and HOUS.FRONT SECT are free of burrs before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing that encloses all internal components |
| 4657201028 | HOUS.FRONT SECT | Front section housing that supports the input shaft and pump |
| 4657201013 | HOUSING REAR PART | Rear housing section that contains the output shaft and tail seal |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for precise positioning of housing sections |
| 0636100801 | CAP SCREW | Fastener for securing duct plate to housing |
| 4656301148 | FIXING PLATE | Retention plate that locks duct plate in position |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil inlet circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for sump return |
| 0636100803 | CAP SCREW | M8 bolt for housing-to-duct plate assembly |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing that supplies pressurized fluid to duct plate |
Frequently Asked Questions
Q: Can I install the 4657.306.101 duct plate without removing the transmission from the vehicle?
A: In most applications, you can access the duct plate by dropping the transmission pan and removing the valve body. However, on WG190 series units with a HOUSING REAR PART obstruction, partial transmission removal may be required.
Q: What torque specification should I use for the cap screws securing this duct plate?
A: Use 25 Nm (18.4 ft-lb) for the CAP SCREW fasteners. Over-torquing can distort the duct plate and cause oil leakage.
Q: How do I know if my duct plate is warped before installation?
A: Place the duct plate on a flat surface and check for a gap greater than 0.05 mm using a feeler gauge. Warpage often occurs near the OIL FEED.HOUSG. interface.
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