Control Valve - Komatsu Galeo PC138US-8 Shop Manual

SEN02549-02

Control valve

Outline
The control valves of the following types are set.
6-spool valve (Without service valve)
q
7-spool valve (6-spool valve + service valve)
q
7-spool valve (Blade)
q
8-spool valve (Blade + service valve)
q
8-spool valve (6-spool valve + 2 service valves)
q
9-spool valve (Blade + 2 service valves)
q
The appearance and section of only the 8-spool valve (blade + service valve) are shown here.
A1 : To swing motor
A2 : To blade cylinder bottom
A3 : To left travel motor
A4 : To right travel motor
A5 : To boom cylinder bottom
A6 : To arm cylinder head
A7 : To bucket cylinder head
A8 : To attachment
B1 : To swing motor
B2 : To blade cylinder head
B3 : To left travel motor
B4 : To right travel motor
B5 : To boom cylinder head
B6 : To arm cylinder bottom
B7 : To bucket cylinder bottom
B8 : To attachment
LS : To pump LS valve
P1 : From main pump
P2 : From main pump
PP : To main pump
PR : To solenoid valve, EPC valve
PS : From solenoid valve of merge-divider valve
TB : To tank
TC : To oil cooler
BP1: From boom raise PPC valve
LS1: LS1 pressure pickup port
LS2: LS2 pressure pickup port
1. Cover
2. Service valve
3. Bucket valve
4. Arm valve
5. Boom valve
6. Right travel valve
7. Left travel valve
8. Blade valve
2
10 Structure, function and maintenance standard
LS3 : LS3 pressure pickup port
PA1 : From swing left PPC valve
PA2 : From blade lower PPC valve
PA3 : From left travel forward PPC valve
PA4 : From right travel forward PPC valve
PA5 : From boom raise PPC valve
PA6 : From arm dump PPC valve
PA7 : From bucket dump PPC valve
PA8 : From service PPC valve
PB1 : From swing right PPC valve
PB2 : From blade raise PPC valve
PB3 : From left travel reverse PPC valve
PB4 : From right travel reverse PPC valve
PB5 : From boom lower PPC valve
PB6 : From arm in PPC valve
PB7 : From bucket curl PPC valve
PB8 : From attachment PPC valve
PMAX: Pressure sensor port
PP1 : PP1 pressure pickup port
PP2 : PP2 pressure pickup port
PPI1 : Pump 1 pressure pickup port
PPI2 : Pump 2 pressure pickup port
PRI : PR pressure pickup port
PST : From travel junction solenoid valve
TS1 : To tank
PS2 : To tank
TSW : To swing motor
9. Swing valve
10. Block
11. Swing bleeding valve
12. LS check valve
13. Travel junction valve + LS check valve
14. Arm regeneration valve
15. Boom hydraulic drift prevention valve
16. Merge-divider valve block
1
PC138US, USLC-8