Hyundai HX145LCR Manual page 179

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4. ARM OUT OPERATION

When the left control lever is pushed forward, the arm spools in the main control valve are moved to

the arm out position by the pilot oil pressure from the remote control valve.

The oil from the A1 and A2 pump flows into the main control valve and then goes to the small

chamber of arm cylinder. At the same time, the oil from the large chamber of arm cylinder returns to

the hydraulic oil tank through the arm 1 spool in the main control valve. When this happens, the arm

rolls out. The cavitation which will happen to the rod side of the arm cylinder is also prevented by the

make-up valve in the main control valve. When the arm is roll out and the control lever is returned to

neutral position, the circuit for the holding pressure at the rod side of the arm cylinder is closed by

the arm holding valve. This prevent the hydraulic drift of arm cylinder.

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