The Straight-axis oblique disc plunger pump is divided into two kinds: pressure oil supply and self-priming oil type. Pressure oil pump hydraulic pumps are mostly the use of gas tanks with air pressure, oil by the pressure of the hydraulic tank, after each start of the machine, the hydraulic tank must be achieved after the use of air pressure, to operate the machinery. If the hydraulic tank is not enough pressure to start the machine, the hydraulic pump will cause the sliding shoe pull off the phenomenon, will cause the pump body return plate and the abnormal wear.
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