HYDRAULICS – CX210/CX240
6 - 12
CX EXCAVATORS
TRAVEL
Straight Travel
1) When performing travel operation + attachment operation or travel operations + swing
operation, one pump is dedicated to the travel motors. The other pump will supply oil to
the other functions.
The operating method that follows uses travel + boom raise as an example. During travel
operation, pressurized oil from P1 (front pump) enters the P1 port of the control valve.
Pressurized oil from P2 (rear pump) enters the P2 port of the control valve. Each of these
pressurized oils flows to a right or left travel motor and travel operation is performed. At this
time, when the boom raise operation is executed, a pilot signal passage in the control valve
is intercepted and the straight travel spool is shifted. The pressurized oil that was delivered
from P1 (front pump) through the P1 port of the control valve flows to the right and left travel
motors. The pressurized oil that was delivered from P2 (rear pump) through the P2 port of
the control valve flows to the boom cylinder by way of the boom1 and boom2 spool. In this
way, boom raise movement is performed and straight travel is maintained. Oil from pump2
not needed by the upper attachment is routed to the pump1 travel circuit through an orifice
and check valve to assist in travel speed during straight travel.
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