Overview
The ZF 2094.122.411 PUMP DRIVE is a critical hydraulic component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part serves as the primary interface between the transmission’s internal gear train and the external hydraulic pump, converting rotational power into fluid flow for clutch actuation and lubrication circuits. The SKU 2094.122.411 is precision-machined to maintain exacting tolerances, ensuring consistent oil pressure delivery across all operating conditions. It mounts directly onto the 2094101012 TRANSMISSION HOUSING, forming a sealed assembly that prevents contamination ingress while supporting the pump shaft under high torque loads.
Symptoms of Failure
- Hydraulic pressure drop during gear engagement: When the pump drive wears, internal gear teeth lose mesh, causing insufficient oil flow to clutches. Operators notice delayed shifts or “slipping” under load, especially in WG130 models.
- Oil seepage around the pump mounting flange: Degraded sealing surfaces allow transmission fluid to escape. Look for wet spots near the 2094301036 HOUSING interface, often mistaken for simple gasket failure.
- Whining or grinding noise from the pump area: Worn bearings or scored drive splines produce audible metallic sounds at idle or during acceleration. This indicates imminent pump drive failure requiring immediate replacement.
- Erratic transmission temperature spikes: Reduced pump efficiency from a failing drive forces the system to work harder, generating excess heat. Dashboard temperature warnings may accompany other symptoms.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2094.122.411 |
| Material | Hardened alloy steel (case-carburized) |
| Weight | 2.85 kg (6.28 lbs) |
| Overall Length | 142 mm |
| Flange Diameter | 98 mm |
| Spline Count | 14-tooth involute |
| OEM Reference | ZF 2094.122.411 |
| Max Torque Capacity | 320 Nm |
| Seal Type | Integrated lip seal (replaceable) |
Compatibility
This pump drive is specifically designed for ZF’s WG-series powershift transmissions. Verified compatible models include WG100, WG130, and WG131. It also fits select WG180 and WG200 variants when used with the appropriate 2094298057 HOUSING adapter. The part interfaces directly with the 2094301071 COVER to create a sealed pump cavity. Always confirm your transmission’s serial number against ZF’s parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101012 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 2094301036 | HOUSING | Intermediate pump mounting bracket |
| 2094298057 | HOUSING | Adapter housing for WG180/200 models |
| 2094301071 | COVER | Seals pump drive cavity |
| 0750111371 | SHAFT SEAL | Prevents oil leakage at drive shaft |
| 0634303085 | O-RING | Seals housing-to-cover joint |
| 2094301030 | GASKET | Flange sealing between pump and housing |
| 0631306670 | CYLINDRICAL PIN | Alignment dowel for precise assembly |
| 0636011356 | HEXAGON SCREW | Fastener for pump drive retention |
| 4475280060 | SCREW PLUG | Closes oil gallery ports |
