Charge Pump Calculator

Size the charge pump for closed-loop hydraulic systems including flow, pressure, and filtration requirements.

Input Parameters

Results

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Required Charge Flow
GPM
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Charge Pump Displacement
in³/rev
--
Heat from Relief
BTU/hr
--
Min Filter Size
GPM
Note: Charge pump must supply case drain leakage, flushing/cooling flow, and servo pilot flow. Typical charge pressure: 300-400 psi.

Reference

Leakage Flow = Main Flow × Leak % Cooling Flow ≈ 5% of Main Flow Total Charge = Leakage + Cooling + Servo Charge Disp = (Charge Flow × 231) / (RPM × 0.90) Filter Size = 1.5 × Charge Flow