CASE CONSTRUCTION CX37C, Operator'S Manual

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9 - ACCESSORIES
Auxiliary hydraulic circuits
The machine can provide a single-acting hydraulic circuit or a double-acting hydraulic circuit.
• The single-acting hydraulic circuit is intended for usage of attachments such as a hydraulic breaker.
• The double–acting hydraulic circuit is intended for usage of attachments such as clamshell or shears.
Hydraulic switching
The selection between the single-acting hydraulic circuit
and the double-acting hydraulic circuit is done acting on
the bolt located on the three-way valve near the hydraulic
oil tank.
To select the hydraulic circuit perform the following oper-
ations.
Park the machine on a flat and level place. Stop the en-
gine, and remove the starter key.
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Open the right-hand side hood to access to the three-way
valve.
Use a spanner to turn the bolt of the three-way valve and
select the hydraulic circuit.
•
(1) : one way flow, single-acting hydraulic circuit
•
(2) : two way flow, double-acting hydraulic circuit
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Circuit configuration
As for breaker oil pressure line, use extra spool of main control valve.
Set proper breaker pressure on load relief valve.
The pressure of the system is 19615 kPa ( 2845 psi ).
The accumulator should be used to the breaker charging and return line. If the accumulator is not used, it will be
damage as the input wave is delivered.
Keep the pressure pulsation of pump below
5861 kPa ( 850 psi ) by installing the accumulator.
Do not connect the breaker return line to the main control, but connect to the return line front of the cooler.
Do not connect the breaker return line to drain lines, such as of swing motor, travel motor or pump, otherwise they
should be damaged.
One of spool of the main control valve should be connected to the tank.
Select the size of pipe laying considering the back pressure.
Shim-less tube should be used for the piping.
Weld the bracket for pipe clamp to prevent damage caused by vibration.
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