Overview
The ZF 0501.214.261 PUMP is a critical hydraulic component engineered specifically for the WG90 and WG94 transmission series. This OEM genuine part serves as the primary fluid mover, generating the necessary oil pressure to actuate clutches, cool internal components, and lubricate gear sets within the transmission assembly. Positioned within the lower valve body region, the pump draws transmission fluid from the sump and delivers it under pressure to the torque converter and hydraulic control system. The SKU 0501.214.261 is a direct replacement for factory-installed units, ensuring precise flow rates and pressure tolerances required for reliable operation in heavy-duty industrial applications.
Symptoms of Failure
- Low hydraulic pressure and gear slipping — When the pump wears, internal clearances increase, causing pressure drop. Operators may notice delayed engagement or slipping under load, especially during cold starts.
- Whining or groaning noise from transmission — A failing pump often produces a high-pitched whine due to cavitation or worn gears. This noise typically intensifies at higher RPMs.
- Overheating transmission fluid — Reduced flow from a degraded pump leads to inadequate cooling. Fluid temperatures may spike, causing burnt smell or discolored oil.
- Erratic shifting or harsh engagement — Inconsistent pressure delivery from the pump results in unpredictable shift quality, including hard shifts or failure to hold gear.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (OEM) | 0501.214.261 |
| Material | High-strength aluminum alloy with hardened steel gears |
| Weight | 2.85 kg (6.28 lbs) |
| Dimensions (L x W x H) | 185 mm x 120 mm x 95 mm |
| Flow Rate | 28 L/min @ 1500 RPM |
| Maximum Operating Pressure | 18 bar (261 psi) |
| OEM Reference | ZF 0501.214.261 |
Compatibility
This pump is designed for the ZF WG90 and WG94 series transmissions, which are commonly used in off-highway vehicles, construction equipment, and industrial machinery. Based on its hydraulic displacement and mounting pattern, the 0501.214.261 is also compatible with the following ZF models: WG180, WG200, WG210, and WG250. Always verify your transmission serial number before ordering to ensure correct fitment.
When replacing this pump, it is essential to inspect adjacent components that share the same hydraulic circuit. The 4661101001 TRANSMISSION HOUSING must be free of cracks or wear at the pump mounting surface. Additionally, the 4661301007 HOUSING should be checked for scoring. The 4661301093 TUBE delivers pressurized fluid from the pump to the valve body and often requires replacement if debris is present. Finally, the 0631306174 CYLINDRICAL PIN aligns the pump assembly and must be intact to prevent misalignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101001 | TRANSMISSION HOUSING | Encloses and supports pump and gear train |
| 4661301007 | HOUSING | Secondary housing for hydraulic control components |
| 4661301093 | TUBE | Pressurized fluid conduit from pump to valve body |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for pump and housing assembly |
| 0769123894 | TYPE PLATE | Identification plate with transmission serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports and drain holes |
| 0636302602 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0634100633 | O-RING | Seals pump-to-housing interface |
| 4661301029 | NOZZLE | Calibrated orifice for lubrication flow control |
| 4661301027 | NOZZLE | Secondary lubrication nozzle for planetary gears |
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