Overview
The ZF 4166.332.194 CIRCUIT COVER is a precision-engineered OEM genuine component designed for the WG150, WG200, and WG201 transmission series. This part serves as a critical sealing and protective barrier, enclosing the hydraulic control circuit within the transmission valve body. By maintaining correct fluid pressure and preventing contamination ingress, the circuit cover ensures consistent shift quality and clutch engagement. The SKU 4166.332.194 is manufactured to ZF’s exacting tolerances, making it a direct-fit replacement for original equipment. When installed alongside a TRANSMISSION HOUSING or a TRANSMISSION HOUSING, this cover completes the sealed assembly required for reliable operation.
Symptoms of Failure
When the ZF 4166.332.194 circuit cover degrades or becomes damaged, operators may notice several distinct failure indicators. External oil seepage around the valve body area is the most common symptom, often appearing as wet streaks on the transmission housing. Erratic or delayed gear engagement occurs when the cover loses its seal, allowing hydraulic pressure to drop below operational thresholds. Contaminated transmission fluid can result from cracks in the cover that permit dirt and debris to enter the control circuit. Additionally, intermittent slipping under load may develop as the cover warps or its gasket surface deteriorates, directly affecting shift timing.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4166.332.194 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Overall Dimensions | Approx. 180 mm x 120 mm x 25 mm |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4166.332.194 (Genuine) |
| Mounting Points | 6 bolt holes (M8 thread pattern) |
| Seal Type | Integrated gasket channel (gasket sold separately) |
Compatibility
This circuit cover is engineered for the ZF WG150, WG200, and WG201 series transmissions. It is commonly found in off-highway vehicles, construction equipment, and agricultural machinery that utilize these ZF power shift transmissions. The part also interfaces with the TYPE PLATE for identification and the GROOVED STUD for secure fastening. While primarily designed for the listed series, it may also be compatible with certain WG180 variants where the valve body configuration matches. Always verify your transmission model number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101109 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301205 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Fastening stud for cover mounting |
| 4642301168 | SCREEN SHEET | Filter screen for hydraulic circuit |
| 4642301169 | SCREEN SHEET | Secondary filter screen variant |
| 0636100621 | HEXAGON SCREW | Mounting bolt for cover assembly |
| 4642301186 | SCREEN SHEET | Fine mesh screen for debris filtration |
| 4644106300 | SHIFT SYSTEM | Hydraulic shift control assembly |
| 4644306500 | COVER PLATE | Access cover for valve body inspection |
