6.
HYDRAULIC SYSTEM
6-
6-4
5) Simultaneous Operation of Blade and Travel
When the both travel spools are pulled out and the blade spool is pushed in, the oil from the port P1 and that from
the port P2 flow to the travel section ports B5 and B10 respectively, while some of each oil flow is regulated to a
specified quantity through the throttle and the specified quantity of oil flows to the blade section. These divided oil
flows which have come into the blade section are combined after passing through the load check valve, and the
combined oil flows to the port A6.
The return oil from the port B6 returns to the tank through the tank passage.
The blade section is supplied with the same specified quantity of divided oil from the ports P1 and P2 ; therefore, the
both travel sections are also supplied with the same quantity of oil. Thus, the machine can travel without deviation
even when the blade is operated during traveling.
When the travel spools are pushed in and the blade spool is pulled out, the oil from the port P1 and that from the port
P2 flow to the travel section ports A5 and A10 respectively and the specified quantity of divided oil flows through the
blade section to the port B6. Then, the oil returns from the port A6 to the tank through the tank passage.
Pump port P2
Pump port P2
Pull out
Pull out
Tank passage
Tank passage
Tank passage
Tank passage
Port A6
Push in
Pump port P1
Pump port P1
Tank port
Port B6
T
ravel (L)
Blade
T
ravel (R)
To port B10
To port
A6
To port B5
Summary of Contents for ViO12-2A
Page 1: ...SERVICE MANUAL EXCAVATOR ViO12 2A...
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Page 109: ...5 3 1 5 ELECTRIC SYSTEM 5 3 Wiring Diagram...
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Page 123: ...6 HYDRAULIC SYSTEM 6 2 1 6 2 Hydraulic Circuit Schematic...
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Page 219: ...6 HYDRAULIC SYSTEM 6 7 8 1 4 3 8 7 12 10 10 15 a b c Loctite 262 0 30Nm 0 45Nm...
Page 348: ...7 ADJUSTMENT AND REPAIR 7 5 31 6 Control Levers Pilot valves Control valve...
Page 349: ...7 ADJUSTMENT AND REPAIR 7 5 32 7 Upperstructure Implement Bucket cylinder Arm cylinder...
Page 351: ...7 ADJUSTMENT AND REPAIR 7 5 34 9 Undercarriage High speed travel solenoid valve...
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Page 360: ...CHAPTER 8 PERIODIC INSPECTION AND SERVICING 8 1 List of Periodic Inspection and Servicing 8 1...
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Page 364: ...CHAPTER 9 FUEL LUBE OIL AND GREASE RECOMMENDED 9 Fuel Lube Oil and Grease Recommended 9 1...
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Page 406: ...CHAPTER 11 REFERENCE DATA 11 1 Specifications for Attachment 11 1...
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