Overview
The ZF 4166.336.410 CIRCUIT COVER is a precision-engineered OEM genuine component designed specifically for the WG 200 Series transmission family. This critical part seals the hydraulic circuit housing, ensuring optimal fluid pressure regulation and preventing contamination within the valve body assembly. As an integral element of the transmission’s control system, the circuit cover maintains the integrity of oil passages that govern clutch engagement and gear shifts. The SKU 4166.336.410 is manufactured to ZF’s exacting tolerances, guaranteeing a perfect fit and long service life. When installed alongside the 4644101177: TRANSMISSION HOUSING or the 4644301229: TRANSMISSION HOUSING, this circuit cover forms a sealed boundary that protects sensitive internal components from debris and pressure loss.
Symptoms of Failure
- Hydraulic oil seepage around the valve body: A degraded circuit cover gasket or warped cover can cause visible fluid leaks, leading to low transmission fluid levels and eventual gear slippage.
- Erratic or delayed shifting: When the circuit cover fails to maintain proper pressure, you may experience hesitation during gear changes or harsh engagement, especially under load.
- Contaminated transmission fluid: A cracked circuit cover allows dirt and moisture to enter the hydraulic system, resulting in dark, gritty oil that accelerates wear on clutches and seals.
- Overheating transmission: Loss of hydraulic pressure from a compromised cover forces the transmission to work harder, generating excessive heat that can trigger warning lights or thermal shutdown.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4166.336.410 |
| Material | Die-cast aluminum alloy with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 25 mm |
| OEM Reference | ZF 4166.336.410 |
| Sealing Surface | Precision-machined flat surface for O-ring compatibility |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This circuit cover is primarily engineered for the WG 200 Series transmissions, including models such as WG180, WG200, and WG210. It also fits select variants of the ZF Ecomat 4HP and 5HP series where the valve body configuration matches. For exact fitment, verify your transmission’s serial number against the OEM parts catalog. The cover integrates with the 0730365067: TYPE PLATE for identification and is secured using the 0631311009: GROOVED STUD to ensure proper torque retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101177 | TRANSMISSION HOUSING | Main structural casing for gear train and hydraulic components |
| 4644301229 | TRANSMISSION HOUSING | Alternate housing variant for specific WG200 configurations |
| 0730365067 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0631311009 | GROOVED STUD | Fastener for securing circuit cover to housing |
| 4644303060 | COVER PLATE | Secondary cover for access ports on transmission housing |
| 4644303061 | COVER PLATE | Alternative cover plate with different bolt pattern |
| 0634306525 | O-RING | Sealing ring for circuit cover to prevent fluid leaks |
| 0636305026 | SCREW PLUG | Threaded plug for drain or test ports |
| 0501316470 | BREATHER | Ventilation valve to equalize internal pressure |
| 4644301279 | SCREEN SHEET | Filter mesh for hydraulic fluid intake |
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