1.52 HYDRAULICS LS pump (2) The load sensing hydraulic pump supplies pressure to operate all services, except the fan motor and hydraulic filter. The pump operation phases are as follows: LS pump compensator (3) operation The pressure spring of the volumetric flow controller (3) is designed so that the pump pressure acting on the face is always 20 bar (290 psi) higher than the load pressure acting via port (2). The pressure of 20 bar (290 psi) is the stand-by pressure. The pressure regulator (4) limits the pressure in the service hydraulic circuit to 250 ±5 bar (3625 ±70 psi) (PRV function). 1. LS compensator (3) 2. Inlet port 3. Volumetric flow controller 4. Pressure regulator 5.
Connection to pump 6. Connection to control plunger of pump 7. Connection to tank 8. Orifice AA Supply oil BB Oil at reduced pressure DD Control oil LL Tank