When F and R are merged, not only pump pressures are same but also LS pressures become same. The Pressure compensation valve of the lighter load side is compensated or the passage is throttled by the higher LS pressure. It generates pressure loss with 200K in this case. In order to save the loss, two EPC vales are installed for merging to dividing / dividing to merging switching of main and LS pressures with modulation in stead of ON/OFF solenoid control on PC200-7.