Hydraulic System Diagram - IHI 15VX Operation Manual

Boom Swing Swing
Brake
Valve
OR4
For high speed
travel shift
solenoid valve
SOL
RER
To remote
control
valve
Remote
control pump
Main pump
(variable plunger + gear)
Relief valve set pressure
Code
MR1 Main relief valve P1 Pump
MR2 Main relief valve P2 Pump
MR3 Main relief valve P3 Pump
OR1 Overload relief valve (Boom)
OR2 Overload relief valve (Arm)
OR3 Overload relief valve (Bucket)
OR4 Overload relief valve (Blade)
SWR Swing relief valve
RER Remote control relief valve

HYDRAULIC SYSTEM DIAGRAM

5-1 HYDRAULIC SYSTEM DIAGRAM
Travel Right
Brake
SWR
Valve
T1
P3
MR3
Name
Blade Spanner Travel Left
Brake
Valve
Rotary
Joint
OR2
MR1
P1
P2
OR2
MR2
Engine
Yanmar
3TNV70
Pressure
MPa kgf/cm
20.6 210
20.6 210
18.1 185
24.5 250
24.5 250
24.5 250
20.6 210
15.2 155
6.9 70
5 – 1
Arm Boom
OR1
OR3
OR1
Control valve
Hydraulic tank
Return filter
Suction strainer
Tank level capacity
19 liters
2
Total system volume
23 liters
Pump flow rate (Max.):
P1 ; 17.2 liter/min
P2 ; 17.2 liter/min
P3 ; 12.0 liter/min
The service ports use
the flow shared by the
P2 and P3 pumps.
Bucket