Group 4 Single Operation - Hyundai HX130LCR Manual

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GROUP 4 SINGLE OPERATION

1. BOOM UP OPERATION

When the right control lever is pulled back, the boom spools in the main control valve are moved to

the up 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 boom cylinders. At the same time, the oil from the small chamber of boom cylinders

returns to the hydraulic oil tank through the boom 1 spool in the main control valve. When this

happens, the boom goes up. The excessive pressure in the boom cylinder head side is prevented

by relief valve. When the boom is up and the control lever is returned to neutral position, the circuit

for the holding pressure at the head side of the boom cylinder is closed by the boom holding valve.

This prevents the hydraulic drift of boom cylinder.