Coupling causes low oil pressure

Coupling causes low oil pressur1 working oil filter clogging;2) Operating pressure relief valve installed incorrectly or damaged3 Working oil pump suction pipe blockage4 Working oil pump intake air.The hydraulic coupling solution is too low1 cleaning filter strainer;2  Hydraulic tube fittings fault and correct installation of the oil pressure relief valve;3 Check and clean up the oil pump inlet tube;4 Check the oil pump suction pipe sealing work, clear leakage.