MAINTENANCE
45V4 • 55V4 • 60V4 ENG
3-40
HYDRAULIC SYSTEM DIAGRAM
Travel right
Travel left
Hydraulic oil tank
To remote control valve
Suction strainer
Oil cooler
Travel speed select solenoid
Pilot pump
Return filter
Engine
KUBOTA
Main pump
Variable capacity plunger
Bucket
Boom
Arm
Service
Blade
Boom
swing
Swing
Communicating
valve
Travel
right
Travel
left
Bucket
Boom
Blade
Rotary
Joint
Brake
valve
Brake
valve
Arm
Swing
Boom swing
Code
Name
Pressure
MPa
kgf/cm
2
MR1
Main relief valve P1 Pump
24.5
250
MR2
Main relief valve P2 Pump
24.5
250
MR3
Main relief valve P3 Pump
20.6
210
OR1
Overload relief valve (Boom)
27.4
280
OR2
Overload relief valve (Arm)
27.4
280
OR3
Overload relief valve (Bucket)
27.4
280
OR4
Overload relief valve (Blade)
24.5
250
SWR
Swing relief valve
16.7
170
RER
Remote control relief valve
2.9
30
Pump flow rate (Max.):
P1: 60 liter/min
P2: 60 liter/min
P3: 44.2 liter/min
The service ports use the flow shared by
the P2 and P3 pumps.
P2 + P3; 104 liter/min
Summary of Contents for Menzi IHI 45v4
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