420 Hydraulic system, Part 2 Control valve
SEN04608-01
Control valve
1
Outline a
a a
A1 A2 A3 A4 A5 A6 A7 A8 A9 B1 B2 B3 B4 B5 B6 B7 B8 B9 C LS P1 P2 P3 PA1 PA2 PA3 PA4
The control valve is an add-on type where one service valve each can be added, so it is possible to add valves or remove valves if necessary. The service valve is installed additionally between the top cover and lower valve. As for the 10-spool valve, only the parts different from the 9-spool valve are shown.
: To L.H. travel motor : To R.H. travel motor : To boom cylinder head : To arm cylinder head : To bucket cylinder head : To boom swing cylinder head : To blade cylinder head : To swing motor port (MA) : To attachment actuator : To L.H. travel motor : To R.H. travel motor : To boom cylinder bottom : To arm cylinder bottom : To bucket cylinder bottom : To boom swing cylinder bottom : To blade cylinder bottom : To swing motor port (MB) : To attachment actuator : To oil cooler : To pump LS valve : From main pump (Variable pump) : From main pump (Variable pump) : From main pump (Gear pump) : From L.H. travel FORWARD PPC valve : From R.H. travel FORWARD PPC valve : From boom LOWER PPC valve : From arm OUT PPC valve
10-420
10
PA5 PA6 PA7 PA8 PA9 PB1 PB2 PB3 PB4 PB5 PB6 PB7 PB8 PB9 PP1 PP2 PP3 PLS1 PLS2 PLS3 PTR PS S T TS
: From bucket DUMP PPC valve : From boom swing PPC valve : From blade PPC valve : From swing R.H. PPC valve : From attachment PPC valve : From L.H. travel REVERSE PPC valve : From R.H. travel REVERSE PPC valve : From boom RAISE PPC valve : From arm IN PPC valve : From bucket CURL PPC valve : From boom swing PPC valve : From blade PPC valve : From swing L.H. PPC valve : From attachment PPC valve : (P1) pump pressure : (P2) pump pressure : Pump pressure on work equipment side : L.H. travel LS pressure : R.H. travel LS pressure : Work equipment LS pressure : Travel pressure switch mounting port : To swing motor port (B) : To swing motor port (S) : To tank : To tank
PC45MR-3, PC55MR-3