Group 4 Main Control Valve - Hyundai R480LC-9S Service Manual

GROUP 4 MAIN CONTROL VALVE

GROUP 4 MAIN CONTROL VALVE
1. REMOVAL AND INSTALL 1. REMOVAL AND INSTALL
1) 1) REMOVAL REMOVAL
(1) Lower the work equipment to the ground
and stop the engine.
(2) Operate the control levers and pedals
several times to release the remaining
pressure in the hydraulic piping.
(3) Loosen the breather slowly to release the
pressure inside the hydraulic tank.
Escaping fluid under pressure can Escaping fluid under pressure can
penetrate the skin causing serious penetrate the skin causing serious
injury. injury.
When pipes and hoses are disconnected,
the oil inside the piping will flow out, so
catch it in oil pan.
(4) Remove the wirings for the pressure
sensor and so on.
(5) Remove bolts and disconnect pipe.
(6) Disconnect pilot line hoses.
(7) Disconnect pilot piping.
(8) Sling the control valve assembly and
remove the control valve mounting bolt.
Weight : 420 kg (930 lb)
(9) Remove the control valve assembly.
When removing the control valve
assembly, check that all the piping have
been disconnected.
2) 2) INSTALL INSTALL
(1) Carry out installation in the reverse order
to removal.
(2) Bleed the air from below items.
Cylinder (boom, arm, bucket)
Swing motor
Travel motor
See each item removal and install.
(3)
Confirm the hydraulic oil level and
recheck the hydraulic oil leak or not.
8-31
13031GE18
45078MC01
45078MC02
45078MC03