GENERAL INTRODUCTION
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CX EXCAVATORS
EXPLANATION OF CX SERIES
CX130/CX160/CX210/CX240 Hydraulic System
There is a single main relief with a second (power boost) setting. Boom and arm anti-drift
valves are built into the main control valve. An auxiliary control valve is standard and a
factory installed or field installed kit with plumbing to the end of the arm is available. Other
features that are built into the main control valve are:
Dual flow boom up
Boom down regeneration
Boom down anti-drift
Dual flow arm
Arm in regeneration
Arm in anti-drift
Travel priority
Swing priority
Neutral pump de-stroke
Two electrical pressure switches are installed on the main control valve, and one in the swing
pilot shuttle valve. These switches are used to tell the controller what hydraulic functions are
being operated.
Cushion Control System
The CX Series units have an attachment control cushion system to allow the boom and arm
cylinder control spools to gradually return to neutral, for shock-free operation. This feature
allows a lesser skilled operator to work more smoothly. With the control cushion system
active, the pilot oil from the hand control flows to the arm or boom control spool unrestricted.
When the hand control is returned to neutral, the pilot oil is restricted as it leaves the control
spool. This slow return of the spool accounts for the smooth operation. The system can be
overridden with an electrical control switch on the monitor/switch panel.
Swing
The CX Series Excavators do not have a mechanical house lock. The house lock is
accomplished with the swing brake. Swing lock or (100%) brake is applied when the switch
on the left console is activated or the engine is shut off. The swing brake is applied 5
seconds after the control is returned to neutral.
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