Overview
The ZF 4660.122.002 PRESSURE OIL PUMP is a critical hydraulic component engineered for the WG200, WG92, and WG98 transmission series. This OEM genuine part is responsible for generating the necessary oil pressure to lubricate gears, actuate clutches, and cool internal assemblies. Positioned within the transmission’s oil sump and driven by the input shaft, the pump ensures consistent fluid delivery to the valve body and torque converter. The SKU 4660.122.002 is precision-machined to ZF’s exacting tolerances, making it a direct replacement for worn units. When this pump fails, the entire hydraulic circuit loses integrity, leading to performance degradation. For optimal system reliability, always pair this pump with a new 4660198001 PERIPHERALS kit to refresh seals and gaskets during installation.
Symptoms of Failure
- Low hydraulic pressure and gear slipping: A worn pressure oil pump cannot maintain adequate pressure, causing the transmission to slip under load or hesitate during gear changes.
- Audible whining or groaning noise: Cavitation or worn pump gears produce a high-pitched whine from the transmission pan area, especially at idle or low RPM.
- Delayed engagement or harsh shifting: Insufficient oil flow leads to slow clutch pack engagement, resulting in a noticeable lag when shifting from Park to Drive or Reverse.
- Overheating transmission fluid: Reduced oil circulation prevents proper heat dissipation, causing the fluid to overheat and potentially damage internal components like the 0501209818 RANGE SELECTOR.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4660.122.002 |
| OEM Reference | ZF 4660.122.002 |
| Material | High-strength aluminum alloy with hardened steel gears |
| Weight | 1.85 kg (4.08 lbs) |
| Overall Dimensions | 145 mm x 90 mm x 75 mm |
| Operating Pressure Range | 8–15 bar (116–218 psi) |
| Flow Rate | 18 L/min at 2000 RPM |
| Seal Type | Integrated O-ring groove (use 0634100317 O-RING) |
| Mounting Hardware | Requires 0636103273 CAP SCREW set (4 pcs) |
Compatibility
This pressure oil pump is designed for ZF WG-series transmissions with hydraulic control systems. It directly fits the WG200, WG92, and WG98 models. Based on the pump’s mounting flange and gear profile, it is also compatible with the WG180 and WG120 series when used with the correct 4660221012 SUCTION TUBE. Always verify the pump cavity condition inside the 4660101011 TRANSMISSION HOUSING before installation. For complete assembly, ensure the 4660301018 HOUSING is free of debris and that the pump aligns with the drive tang.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660198001 | PERIPHERALS | Seal and gasket kit for pump installation |
| 0501209818 | RANGE SELECTOR | Hydraulic valve for gear range selection |
| 4660101011 | TRANSMISSION HOUSING | Main structural casing for the transmission |
| 4660301018 | HOUSING | Intermediate housing for pump and valve body |
| 0631306174 | CYLINDRICAL PIN | Alignment pin for pump positioning |
| 0769123894 | TYPE PLATE | Identification label for transmission model |
| 4660221012 | SUCTION TUBE | Oil pickup tube from pan to pump |
| 0634100317 | O-RING | Seal for pump-to-housing interface |
| 0636103273 | CAP SCREW | Fastener for pump mounting |
| 0750100022 | SCREW PLUG | Plug for oil gallery access port |
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