Overview
The ZF 0501.223.163 PISTON PUMP is a critical hydraulic component engineered specifically for the WG 260 and WG 310 series transmissions. This OEM genuine part generates the necessary fluid pressure to actuate clutch packs and modulate gear shifts within the transmission housing. As the primary hydraulic power source, the 0501.223.163 pump draws transmission fluid from the sump and delivers it under pressure to the valve body and shift system. This SKU is a direct replacement for the original factory-installed unit, ensuring precise flow rates and pressure consistency for heavy-duty industrial applications.
Symptoms of Failure
- Erratic or delayed gear engagement – When the piston pump loses internal sealing, hydraulic pressure drops, causing hesitation when shifting from neutral into drive or reverse.
- Transmission overheating – A worn 0501.223.163 pump reduces fluid circulation, leading to elevated operating temperatures and potential damage to the TRANSMISSION HOUSING.
- Whining or grinding noise from the pump area – Cavitation or worn piston shoes produce audible high-pitched sounds, especially during cold starts or under load.
- Low hydraulic pressure warnings – Dashboard or diagnostic alerts indicating insufficient line pressure, often accompanied by slipping clutches.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.223.163 |
| Type | Axial Piston Pump (Fixed Displacement) |
| Displacement | 12.5 cc/rev (estimated) |
| Maximum Pressure | 25 bar (363 psi) |
| Material | Hardened Steel / Aluminum Alloy Housing |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 0501.223.163 |
| Seal Type | PTFE / Nitrile O-Rings |
Compatibility
This piston pump is primarily designed for the ZF WG 260 and WG 310 series transmissions. It is also compatible with the following ZF models that share the same hydraulic architecture: WG 180, WG 200, and WG 250 series. The pump mounts directly to the HOUSING and is secured by the COVER assembly. For proper sealing, the COVER SHEET must be installed correctly to prevent fluid bypass. Always verify your transmission model and serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101152 | TRANSMISSION HOUSING | Main structural casing for gear and pump assembly |
| 4646301317 | HOUSING | Intermediate housing supporting pump and valve body |
| 4646301332 | COVER | Protective cover for pump access port |
| 4646301102 | COVER SHEET | Gasket/sealing sheet for pump cavity |
| 4646301292 | COVER SHEET | Alternate sealing sheet variant |
| 0636115293 | 螺栓 | Mounting bolt for pump retention |
| 0636102404 | HEXAGON SCREW | Hex head screw for housing fastening |
| 4646201021 | BREATHER | Ventilation valve for pressure equalization |
| 4646106025 | SHIFT SYSTEM | Hydraulic shift control assembly |
| 0736300232 | 螺栓 | Additional mounting bolt |
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