HYDRAULICS – CX130/CX160
5 - 24
CX EXCAVATORS
ATTACHMENT
Boom Raise
1) Two pump flows inside the control valve are combined, when the boom1 and boom2
spools are shifted.
Oil flow from pump1 (front pump) enters the PR port of the control valve and oil from pump2
(rear pump) enters the PL port. When the boom hand control is operated for boom up pilot
pressure is directed through the cushion valve to the boom1 control spool in the main control
valve. The control spool shifts and sends pump1 oil for boom up. Boom up pilot control
pressure is also sent to the boom2 control spool on the pump2 side of the main control valve.
The control spool shifts which directs pump2 oil internally to the boom up circuit at the boom1
spool. This way boom 2-speed is achieved.
When boom up is activated pilot pressure from the boom up control circuit is sent to the
swing priority valve to shift it to unrestricted position to assure pump1 oil for arm circuit
operation.
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