oem HPK055AT-RH18A Hydraulic Pump ZAX120 ZAX130 ZAX135 Excavator Parts Main Pump for Hitachi HPK055 Piston Pump

Deslocamento: 112 CC/REV (per pump element).

Flow Rate:

Max Flow: ~264 L/min at 2,360 RPM (calculated as 112 cc/rev × 2,360 RPM × 0.98 efficiency).

Rated Flow: 240–250 L/min under typical load conditions.

Pressure Ratings:

Rated Pressure: 34.3 MPa (350 kgf/cm² / 4,975 psi).

Max Pressure: 39.2 MPa (400 kgf/cm² / 5,685 psi) for short-term peak loads .

Speed:

Max Operating Speed: 2,360 RPM (matched to Hitachi’s 4JJ1 engine output).

Recommended Speed Range: 1,800–2,200 RPM for prolonged durability.