Overview
The ZF 0501.216.557 PUMP is a critical hydraulic component engineered for the WG92 and WG98 transmission series. This OEM genuine part generates the necessary oil flow and pressure to actuate clutch packs, lubricate gears, and cool internal assemblies within the gearbox. Positioned directly on the torque converter housing, the pump draws fluid from the sump via a SUCTION TUBE and delivers it under pressure to the valve body. The SKU 0501.216.557 is precision-machined to ZF factory tolerances, ensuring reliable volumetric efficiency and consistent output across the entire operating range of the transmission.
Symptoms of Failure
- Delayed engagement or gear slipping under load: When the pump loses internal clearance, insufficient line pressure causes clutches to slip, especially during uphill hauling or heavy towing.
- Low hydraulic pressure at idle: A worn 0501.216.557 pump often fails to maintain minimum pressure when the engine is at idle, triggering warning lights or diagnostic codes.
- Whining or cavitation noise from the transmission: Air entrainment or worn gears produce a distinct high-pitched whine that increases with engine RPM, indicating the pump is struggling to prime.
- Overheating transmission fluid: Reduced flow from a failing pump leads to inadequate cooling, causing the fluid to darken and the transmission to run hotter than normal.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.216.557 |
| Type | Gerotor / Gear Pump |
| Material | Hardened Steel Rotor, Aluminum Housing |
| Weight | 2.8 kg (6.2 lbs) |
| Overall Length | 145 mm |
| Mounting Flange Diameter | 108 mm |
| OEM Reference | ZF 0501.216.557 |
| Max Operating Pressure | 22 bar (320 psi) |
| Displacement | 18.5 cc/rev |
Compatibility
This pump is specifically designed for ZF WG92 and WG98 series transmissions. Based on its hydraulic displacement and mounting pattern, the 0501.216.557 is also compatible with the WG180, WG200, and WG210 models used in medium-duty trucks, buses, and construction equipment. The pump interfaces directly with the TRANSMISSION HOUSING and is secured by a HOUSING II cover. During installation, a CYLINDRICAL PIN aligns the pump to the housing, and the TYPE PLATE should be inspected for correct model identification. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101017 | TRANSMISSION HOUSING | Main structural casing that encloses the pump and gear train |
| 4660301054 | HOUSING II | Rear cover that seals the pump cavity and supports bearings |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise pump-to-housing positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals pressure test ports on the pump housing |
| 4660221029 | SUCTION TUBE | Transfers oil from the pan to the pump inlet |
| 0634100317 | O-RING | Seals the suction tube connection to prevent air leaks |
| 0636103273 | CAP SCREW | Fastens the pump assembly to the transmission housing |
| 0634306311 | O-RING | Seals the pump outlet port to the valve body |
| 4660321029 | FIXING PLATE | Retains the pump gears and prevents axial movement |
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