Hyundai HX145LCR Manual page 178

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3. ARM IN OPERATION

When the left control lever is pulled back, the arm spools in the main control valve are moved to the

arm in 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 large

chamber of arm cylinder.

At the same time, the oil from small 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 in.

The excessive pressure in the arm cylinder head side is prevented by relief valve.

The cavitation which will happen to the head side of the arm cylinder is also prevented by the make-

up valve in the main control valve.

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