Overview
The ZF 2094.122.008 PUMP DRIVE is a critical hydraulic power transfer component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part, identified by SKU 2094.122.008, sits directly within the transmission housing assembly, connecting the torque converter to the hydraulic pump. It ensures precise oil flow regulation for clutch actuation and lubrication. When installed alongside the 2094101012 TRANSMISSION HOUSING, it forms a sealed, high-pressure circuit that drives all auxiliary hydraulic functions in heavy-duty industrial machinery.
Symptoms of Failure
- Erratic hydraulic pressure drops: A worn pump drive causes intermittent pressure loss, leading to delayed gear engagement or clutch chatter during load shifts.
- Oil leaks at the pump mounting interface: Degraded seals around the drive shaft result in visible fluid seepage, often mistaken for a failing 2094301036 HOUSING gasket.
- Whining or grinding noises from the transmission bell housing: Bearing wear within the pump drive produces high-pitched sounds that intensify under acceleration, indicating imminent failure.
- Overheating transmission fluid: Insufficient pump drive rotation reduces oil circulation, causing the system to run hot and potentially damaging the 2094298057 HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 2094.122.008 |
| Material | Hardened alloy steel with nitrided surface |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 145 mm x 85 mm x 95 mm |
| OEM Reference | ZF 2094.122.008 |
| Torque Capacity | 450 Nm (332 ft-lbs) |
| Seal Type | Double-lip PTFE shaft seal |
Compatibility
This pump drive is specifically designed for ZF WG-series transmissions, including the WG100, WG130, and WG131 models. It also fits select variants of the WG180 and WG200 series when paired with the correct 2094301071 COVER. Always verify the transmission serial number before installation, as pump drive spline configurations vary between early and late production units. For WG131 models, ensure the 2094301036 HOUSING is free of cracks to maintain proper alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101012 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 2094301036 | HOUSING | Intermediate pump support housing |
| 2094298057 | HOUSING | Rear bearing carrier housing |
| 2094301071 | COVER | Seals pump drive access port |
| 0750111371 | SHAFT SEAL | Prevents oil leakage at drive shaft |
| 0634303085 | O-RING | Hydraulic seal for pump connections |
| 2094301030 | GASKET | Housing interface seal |
| 0631306670 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636011356 | HEXAGON SCREW | Fastener for pump drive mounting |
| 4475280060 | SCREW PLUG | Seals hydraulic test ports |
