willmar wrangler 4500 <a href='https://www.ruidapetroleum.com/product/47'>hydraulic</a> <a href='https://www.ruidapetroleum.com/product/49'>pump</a> manufacturer

Hydro has charge pump that supplies oil flow and pressure to operate hydro. Charge pressure is adjustable and should be set to manufacturers specification. Charge pressure relief valve is set to 2200 kPa (319 psi).