Group 5 Combined Operation - Hyundai R480LC-9S Service Manual

GROUP 5 COMBINED OPERATION

GROUP 5 COMBINED OPERATION
1. OUTLINE 1. OUTLINE
The oil from the A1 and A2 pump flows through the neutral oil passage, bypass oil passage and
confluence oil passage in the main control valve. Then the oil goes to each actuator and operates
them. Check valves and orifices are located on these oil passage in the main control valve. These
control the oil from the main pumps so as to correspond to the operation of each actuator and
smooth the combined operation.
STRAIGHT TRAVEL SPOOL STRAIGHT TRAVEL SPOOL
This straight travel spool is provided in the main control valve.
If any actuator is operated when traveling, the straight travel spool is pushed to the right by the pilot
oil pressure from the pilot pump.
Consequently, the left and right travel oil supply passage are connected, and equivalent amount of
oil flows into the left and right travel motors. This keeps the straight travel.
ps1
PS
pa11
DR1
pc1
B5
A5
pb9
pb5
ARM1
pci
pa9
pa5
PO
B4
A4
pb4
OPTION
pa4
A3
B3
pb3
pb3
BOOM2
pb7
pa3
B2
A2
pb2
SWING
DR3
pa2
pc6
B1
A1
pb1
TRAVEL-RH
pa1
pr1
PP
P1 PS PT
SH
3-23
ps2
PS
T1
T3 T2 T4
ARM2
BUCKET
BOOM1
TRAVEL-LH
STRAIGHT
TRAVEL
PA PH
P2
PS
A1 A2
pa10
B9
A9
pb9
pa9
B8
A8
pa11
pb8
pa8
DR2
pc2
A7
B7
pc2
pb3
pb7
pa3
pa7
B6
A6
pb6
pa6
P3
4809S3HC20