Overview
The ZF 0501.223.158 PISTON PUMP is a critical hydraulic component engineered for the WG180, WG200, and WG210 series transmissions. This OEM genuine part generates the necessary oil flow and pressure to actuate clutch packs and manage torque converter lock-up within the gearbox. Positioned within the transmission’s valve body assembly, the SKU 0501.223.158 ensures precise fluid delivery, directly influencing shift quality and overall driveline efficiency. When paired with a properly sealed TRANSMISSION HOUSING, this pump maintains consistent lubrication across all rotating elements.
Symptoms of Failure
- Erratic or delayed gear engagement: A worn piston pump cannot build adequate hydraulic pressure, causing hesitation when shifting from neutral into drive or reverse.
- Intermittent transmission slipping under load: As the pump loses volumetric efficiency, the transmission may slip during acceleration, especially on inclines.
- Whining or high-pitched noise from the transmission: Cavitation or worn internal gears produce a distinct whine that increases with engine RPM.
- Visible oil leaks near the pump mounting flange: Degraded seals allow hydraulic fluid to escape, often pooling around the bell housing area.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (SKU) | 0501.223.158 |
| OEM Reference | ZF 0501.223.158 |
| Material | High-strength aluminum alloy with hardened steel internals |
| Weight | 2.85 kg (6.28 lbs) |
| Overall Length | 185 mm |
| Mounting Hole Diameter | 10.2 mm |
| Operating Pressure Range | 12–18 bar (174–261 psi) |
| Seal Type | Integrated O-ring (compatible with O-RING 0634303485) |
Compatibility
This piston pump is designed for ZF’s WG series powershift transmissions. Verified compatible models include WG180, WG200, WG210, WG250, WG251, WG260, and WG310 series. It directly replaces the original pump in these gearboxes without requiring adapter plates. For complete assembly, ensure the OUTPUT FLANGE is correctly torqued and the DISCONNECTION mechanism is free of debris. Use a HEXAGON SCREW (M10x1.5) to secure the pump to the housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105475 | DISCONNECTION | Engages/disengages the PTO drive |
| 4642303097 | OUTPUT FLANGE | Connects transmission to driveshaft |
| 0636020211 | HEXAGON SCREW | Fastens pump and housing components |
| 4644101134 | TRANSMISSION HOUSING | Main structural casing for internals |
| 4644301349 | HOUSING | Encloses planetary gear sets |
| 0730365125 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for precise assembly |
| 0636305019 | SCREW PLUG | Seals oil passages during maintenance |
| 4644301247 | THREADED BUSH | Reinforces threaded mounting points |
| 0634303485 | O-RING | Prevents fluid leaks at pump interface |
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