Forward Travel Circuit; Reverse Travel Circuit - Doosan DX140R Shop Manual

Forward Travel Circuit

When the right and left travel control levers are pushed forward,
output from both of the main pumps is directed through the PR,
PL, TRRF, and TRLF ports on the control valve, through the
upper works center joint, to the travel motors on each side of the
machine.

Reverse Travel Circuit

When the right and left travel control levers are pushed
backward, output from both main pumps is directed through the
PR, PL, TRRR, and TRLR ports on the control valve, through
the upper works center joint, to the travel motors.
Hydraulic System Troubleshooting, Testing and Adjustment
TRAVEL
MOTOR(L)
TRL PILOT VALVE
TRLD
PL TL
CONTROL
VALVE(L)
PUMP(F)
Figure 10
TRAVEL
MOTOR(L)
PILOT VALVE
TRL TRLD
PL TL
CONTROL
VALVE(L)
PUMP(F)
Figure 11
TRAVEL
MOTOR(R)
CENTER JOINT
TRRD TRR
PR
CONTROL
VALVE(R)
PUMP(R)
FG015151
TRAVEL
MOTOR(R)
CENTER JOINT
TRRD
TRR
PR
CONTROL
VALVE(R)
PUMP(R)
FG015152
SP001942
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