Overview
The ZF 4660.306.105 DUCT PLATE is a precision-engineered internal component specifically designed for the WG 92 Series transmission. This OEM genuine part functions as a critical fluid management element, directing hydraulic oil flow within the valve body assembly to ensure proper clutch application and lubrication. The SKU 4660.306.105 sits directly between the main 4660101012: TRANSMISSION HOUSING and the upper 4660301020: HOUSING, creating a sealed channel that prevents cross-contamination of pressurized circuits. Without this duct plate, the transmission cannot maintain the precise hydraulic balance required for smooth shifting under heavy loads.
Symptoms of Failure
- Delayed or harsh gear engagement – When the duct plate warps or develops micro-cracks, hydraulic pressure bleeds between circuits, causing noticeable hesitation when shifting from neutral to drive or reverse.
- Intermittent transmission slipping under load – A worn duct plate allows fluid to bypass the clutch pack, resulting in RPM flare during acceleration, particularly when climbing grades or hauling heavy payloads.
- External oil seepage at the housing interface – Degraded sealing surfaces on the 4660.306.105 permit transmission fluid to weep past the 0631306174: CYLINDRICAL PIN alignment points, leaving visible drips on the bell housing.
- Erratic shift timing – A compromised duct plate disrupts the governor pressure curve, causing the transmission to upshift too early or hold gears too long, often accompanied by a check engine light.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4660.306.105 |
| Material | High-strength aluminum alloy (A356-T6) |
| Overall Dimensions | 185 mm x 95 mm x 12 mm |
| Weight | 0.42 kg (0.93 lbs) |
| OEM Reference | ZF 4660.306.105 (Genuine) |
| Surface Finish | Anodized with precision-ground sealing faces |
| Operating Temperature Range | -40°C to +120°C |
| Torque Specification | 18 Nm (13.3 ft-lbs) for mounting bolts |
Compatibility
This duct plate is engineered for the ZF WG 92 Series, but its design also supports cross-compatibility with several other ZF power take-off and industrial transmission models. Verified applications include the WG92, WG120, WG150, WG180, and WG200 series. The 4660.306.105 interfaces directly with the 4660101804: TRANSMISSION HOUSING and the 4660301008: HOUSING variants found in later production runs. Always verify the 0769123894: TYPE PLATE on your unit to confirm exact revision level before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101012 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4660301020 | HOUSING | Upper valve body cover |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission specs |
| 4660221012 | SUCTION TUBE | Oil pickup conduit from pan to pump |
| 0634100317 | O-RING | Seal for hydraulic port connections |
| 0636103273 | CAP SCREW | Fastener for duct plate retention |
| 0750100022 | SCREW PLUG | Threaded plug for test port sealing |
| 4660101804 | TRANSMISSION HOUSING | Alternate housing variant for WG92 |
| 4660301008 | HOUSING | Alternate upper housing variant |
