Overview
The ZF 2094.122.412 PUMP DRIVE is a critical hydraulic power take-off component engineered specifically for the WG100, WG130, and WG131 transmission series. This OEM genuine part serves as the mechanical interface that transfers rotational energy from the transmission’s internal gear train to an external hydraulic pump, enabling auxiliary systems such as dump bodies, winches, or concrete mixers to operate. The SKU 2094.122.412 mounts directly onto the TRANSMISSION HOUSING and is secured by the COVER assembly, ensuring precise alignment and minimal power loss. Constructed from high-strength alloy steel, this pump drive withstands continuous high-torque loads while maintaining reliable oil circulation through the hydraulic circuit.
Symptoms of Failure
- Hydraulic pump gear slipping under load: When the pump drive’s internal splines wear, the pump may lose engagement, causing intermittent or complete loss of hydraulic function during heavy lifting or dumping operations.
- Oil leaks around the pump drive mounting flange: Deteriorated seals or a cracked drive housing can allow transmission fluid to weep past the O-RING and GASKET, leaving visible puddles beneath the vehicle.
- Abnormal whining or grinding noise from the pump area: Worn bearings or a damaged BALL within the drive assembly produce metallic sounds that intensify with engine RPM, indicating imminent failure.
- Reduced hydraulic pressure or slow actuator response: A failing pump drive cannot transmit full torque to the pump, resulting in sluggish cylinder movement or inability to hold a load.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 2094.122.412 |
| OEM Reference | ZF 2094.122.412 |
| Material | Alloy steel (case-hardened) |
| Weight | 2.8 kg (6.2 lbs) |
| Overall Length | 145 mm |
| Mounting Bolt Pattern | 4-hole, 90 mm PCD |
| Spline Type | SAE B 13-tooth |
| Max Torque Capacity | 450 Nm |
Compatibility
This pump drive is designed for ZF WG-series powershift transmissions used in off-highway and construction equipment. Primary compatibility includes the WG100, WG130, and WG131 models. It may also fit select WG180 and WG200 variants when paired with the correct HOUSING adapter. Always verify the spline count and mounting flange dimensions against your transmission’s serial number before installation. For rebuilds, replace the SHAFT SEAL and CYLINDRICAL PIN to ensure leak-free operation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101011 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 2094301045 | HOUSING | Adapter housing for pump drive mounting |
| 0635460022 | BALL | Bearing element for drive shaft support |
| 2094301044 | COVER | Sealing cover for pump drive cavity |
| 0750111371 | SHAFT SEAL | Prevents oil leakage at drive shaft exit |
| 0634303085 | O-RING | Static seal between housing and cover |
| 2094301030 | GASKET | Flange gasket for oil-tight joint |
| 0631306670 | CYLINDRICAL PIN | Alignment pin for precise assembly |
| 0636011356 | HEXAGON SCREW | Fastener for pump drive attachment |
| 4475280060 | SCREW PLUG | Seals hydraulic port openings |
