Doosan DX60R Shop Manual page 640

3. Lower down operation (Figure 17)
"Pa3" and "Pi1" port are connected and Lower Down pilot
pressure applies to the "Pi1"port.
Operation of the anti-drift plate enables to connect the
spring room side of the poppet to the "DR1" port and make
poppet opening status, and returning passage is
obtained.
Right Run
Method of flowing working oil for Neutral (Figure 18) and
Operation (Figure 19) is as for Arm2.
Boom2/Aux
For Neutral (Figure 20) and Operation (Figure 21), working oil is
supplied to Boom1 through inside passage of the control valve
(Lift Up Mix).
Arm1
For Neutral (Figure 22), Crowd Operation(Figure 23) and Dump
Operation (Figure 24), some of working oil returned from the
cylinder port "B6" returns to the tank and the other oil pushes up
poppet for recovery and supplies oil to "A6" (recovery circuit).
Straight Travel (Figure 25)
For Neutral (Figure 25), Operation (Figure 26), simultaneous
operation of Running and Boom (or Bucket, Arm, Preliminary)
enables to operate the Straight Travel.
Working oil of the P1 pump is supplied to Right Run, P2 pump
to Left Run, and P3 pump to the Boom.
Main Control Valve
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