Overview
The ZF 4661.122.005 PRESSURE OIL PUMP is a critical hydraulic component engineered for the WG 90 and WG 94 series transmissions. This genuine OEM part is responsible for generating the necessary oil pressure to lubricate bearings, cool clutches, and actuate shift elements within the gear train. Positioned directly within the transmission sump, the pump draws fluid through a suction strainer and delivers it under pressure to the valve body and torque converter. The SKU 4661.122.005 ensures a direct replacement fit, maintaining the precise flow rate and pressure specifications required for reliable operation in heavy-duty industrial applications.
Symptoms of Failure
- Erratic gear engagement or slipping: A worn pressure oil pump cannot maintain adequate hydraulic pressure, leading to delayed or soft shifts, especially under load.
- Low transmission oil pressure warning: Dashboard or diagnostic alerts indicating insufficient pressure often trace back to a failing pump, even with proper fluid levels.
- Overheating transmission fluid: Reduced oil flow from a degraded pump causes inadequate cooling, resulting in elevated operating temperatures and potential thermal damage.
- Whining or grinding noise from the transmission: Cavitation or worn pump gears produce audible metallic sounds, particularly during acceleration or at idle.
Technical Specifications
| Part Number | 4661.122.005 |
| Product Type | Pressure Oil Pump (Gear Pump) |
| Material | High-strength aluminum alloy housing with hardened steel gears |
| Weight | Approx. 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4661.122.005 |
| Operating Pressure | 12–18 bar (174–261 psi) |
| Flow Rate | 22 L/min at 2000 RPM |
Compatibility
This pressure oil pump is designed primarily for the ZF WG 90 and WG 94 transmission series. It is also compatible with select models in the WG 180, WG 200, and WG 250 families where the pump mounting flange and drive geometry match. Always verify the transmission serial number against the OEM parts catalog to ensure correct fitment. The pump integrates directly with the 4661101020: TRANSMISSION HOUSING and the 4661301046: HOUSING II, which form the pump cavity. Additionally, the 4661301093: TUBE routes pressurized fluid from the pump to the valve body, while the 0631306174: CYLINDRICAL PIN aligns the pump assembly during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101020 | Transmission Housing | Main structural casing that encloses the pump and gear train |
| 4661301046 | Housing II | Secondary housing that supports pump inlet and outlet ports |
| 4661301093 | Tube | Pressurized oil delivery line between pump and valve body |
| 0631306174 | Cylindrical Pin | Alignment dowel for precise pump-to-housing positioning |
| 0769123894 | Type Plate | Identification label with transmission model and serial number |
| 0750100022 | Screw Plug | Seals oil passages during maintenance or testing |
| 0636302602 | Screw Plug | Drain or fill port plug for pump housing |
| 0634100633 | O-Ring | Seals pump-to-housing interface to prevent external leaks |
| 4661301041 | Nozzle | Directs oil flow to specific clutch packs for cooling |
| 4661301038 | Nozzle | Secondary oil jet for planetary gear lubrication |
ZF 4661.122.005 PRESSURE OIL PUMP – Oil Pump RFQ Support
PartsZF helps B2B buyers source ZF 4661.122.005 PRESSURE OIL PUMP with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This oil pump page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4661.122.005 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: WG 90
- Illustration section: WG 94
- Illustration section: PRESSURE OIL PUMP
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4661.122.005 |
|---|---|
| Normalized SKU | 4661122005 |
| Part name | PRESSURE OIL PUMP |
| Product category | oil pump |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: diagram. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
Related Parts
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- ZF 4646.122.014 PRESSURE OIL PUMP
- ZF 4646.122.016 PRESSURE OIL PUMP
- ZF 4646.122.015 PRESSURE OIL PUMP
