Overview
The ZF 4166.232.027 CIRCUIT COVER is a precision-engineered OEM genuine component designed specifically for the WG 150 Series transmission. This cover functions as a protective and sealing barrier for the hydraulic control circuit, ensuring that pressurized transmission fluid is directed correctly through the valve body assembly. By maintaining proper fluid routing, the circuit cover plays a critical role in clutch engagement and shift timing. The SKU 4166.232.027 is manufactured to ZF’s exacting tolerances, guaranteeing a perfect fit and long service life in heavy-duty industrial applications.
Symptoms of Failure
When the ZF 4166.232.027 circuit cover begins to wear or crack, operators may notice several distinct failure indicators. External transmission fluid seepage around the valve body area is a common early sign, often appearing as wet spots on the housing. Erratic or delayed gear engagement can occur when the cover loses its seal, allowing pressure to bleed off. Intermittent gear slipping under load is another symptom, as the compromised circuit cannot maintain consistent hydraulic pressure. Finally, contaminated transmission fluid may result if the cover allows debris to enter the control circuit, accelerating wear on internal components.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4166.232.027 |
| OEM Reference | ZF Genuine |
| Material | Die-cast aluminum alloy |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 185 mm |
| Width | 95 mm |
| Height | 28 mm |
| Bolt Hole Pattern | 6-point, M8 thread |
| Seal Type | Integrated O-ring groove |
Compatibility
This circuit cover is primarily designed for the ZF WG 150 Series transmission, but it also shares mounting patterns with several other ZF models. Compatible transmissions include the WG 180, WG 200, and WG 250 series, as well as select Ecomat 4HP variants that utilize the same valve body architecture. Always verify your transmission model and serial number before installation to ensure proper fitment. The 4166.232.027 cover interfaces directly with the TRANSMISSION HOUSING (4642101047) and the TRANSMISSION HOUSING (4642301207) to create a sealed hydraulic chamber. For identification purposes, the TYPE PLATE (0730365067) should be referenced to confirm your unit’s specifications. The cover is secured using the GROOVED STUD (0631311009) for precise alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4642301207 | TRANSMISSION HOUSING | Secondary housing for clutch packs |
| 0730365067 | TYPE PLATE | Identification tag for transmission model |
| 0631311009 | GROOVED STUD | Alignment fastener for cover assembly |
| 4642301168 | SCREEN SHEET | Fine mesh filter for fluid debris |
| 4642301169 | SCREEN SHEET | Secondary filter element |
| 0636100621 | HEXAGON SCREW | Mounting bolt for cover retention |
| 4642301186 | SCREEN SHEET | High-flow filter screen |
| 4644106300 | SHIFT SYSTEM | Hydraulic valve actuation assembly |
| 4644306500 | COVER PLATE | External access cover for shift mechanism |
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