dumptruck hydraulic pump is filled from a separate tank installed on truck
it is either hanging off chassis rails on side,between dump bed and cab,or it is between rails under neath dump bed. if under dump bed,u can fill with a hose with funnel joined to hose, takes a while to do this . or if truck bed is not loaded you can raise bed with a crane or other machinery ,enuff to get at tank
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You will probably burn out the hydraulic pump in a short time.
Dump the gas tank out of it. the fuel pump there.
Hydrostatic systems take the mechanical rotary output of an engine or electric motor and convert it to a hydraulic source of power using a hydraulic pump. The hydraulic power is converted back to mechanical power using a hydraulic motor
Loosen the handle to release the jack. remove them fill plug. Pump handle up and down through the full range on motion. Replace plug and test. If it sill does to work satisfactorily, repeat procedure.
No, you need to drain and flush the system.