Overview
The ZF 4166.341.176 PUMP FLANGE is a critical hydraulic interface component engineered specifically for the WG 65 Series transmission family. This OEM genuine part serves as the mounting and drive connection between the transmission’s hydraulic pump and the main gearbox housing, ensuring precise alignment and leak-free oil transfer under high-pressure operating conditions. The SKU 4166.341.176 is machined from high-strength alloy steel to withstand torsional loads and thermal cycling common in heavy-duty industrial applications. When installed correctly, this flange maintains the pump’s concentricity with the transmission input shaft, directly influencing system pressure stability and overall drivetrain efficiency.
Symptoms of Failure
- Hydraulic oil seepage at pump-to-transmission interface: A worn or warped 4166.341.176 flange often causes visible oil weeping around the mounting bolts, leading to gradual fluid loss and potential contamination of adjacent components like the TRANSMISSION HOUSING.
- Intermittent gear slipping under load: Degraded flange mating surfaces can introduce pump misalignment, resulting in inconsistent hydraulic pressure that manifests as momentary torque loss during heavy hauling or grading operations.
- Abnormal pump cavitation noise: A loose or cracked pump flange allows air ingress into the hydraulic circuit, producing a distinct whining or rattling sound from the pump area, especially during cold starts.
- Vibration transmitted through the transmission bell housing: Flange bolt hole elongation or surface fretting creates axial play, transferring harmonic vibrations to the HOUSING assembly and accelerating wear on nearby seals.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4166.341.176 |
| Material | DIN 1.7225 (42CrMo4) Alloy Steel, Induction Hardened |
| Overall Diameter | 185 mm ±0.2 mm |
| Flange Thickness | 22.5 mm |
| Bolt Hole PCD | 150 mm (6 holes, M12 x 1.5) |
| Weight | 1.85 kg (4.08 lbs) |
| Surface Finish | Ra 0.8 µm on sealing face |
| OEM Reference | ZF 4166.341.176 (Genuine) |
| Torque Specification | 85 Nm ±5 Nm (use HEXAGON SCREW fasteners) |
Compatibility
This pump flange is a direct-fit component for the ZF WG 65 Series transmission family, including models WG65, WG80, WG100, WG120, WG150, WG180, and WG200. It is specifically designed to interface with the 4 WG 65 pump assembly and seals against the TRANSMISSION HOUSING using a precision O-ring groove. The flange also accommodates the HEXAGON SCREW fasteners for secure mounting. For complete rebuilds, verify compatibility with your specific transmission serial number, as minor variations exist between early and late production WG65 units.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616000217 | 4 WG 65 | Complete pump assembly for WG65 transmission |
| 4616101101 | TRANSMISSION HOUSING | Main gearbox casing that houses the pump flange |
| 0636011118 | HEXAGON SCREW | M12 mounting bolt for flange retention |
| 4616301304 | HOUSING | Intermediate housing section adjacent to flange |
| 4616301309 | HOUSING | Alternate housing variant for specific WG65 builds |
| 0630361069 | SEALING CAP | Protective cap for unused hydraulic ports |
| 0636011038 | HEXAGON SCREW | M10 fastener for auxiliary bracket mounting |
| 0636016015 | HEXAGON SCREW | M16 bolt for high-torque flange applications |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for precise flange positioning |
| 0634313118 | O-RING | Hydraulic seal between flange and housing |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
