6
. HYDRAULIC SYSTEM
6-
3-
2
5
6
-3-7
Travel
Each travel lever is linked to the spool of the control
valve through L-balls and a rod.
1) Forward Travel (Right)
Oil Flow from Hydraulic Pump
When the right travel lever is pushed forward, the spool
of the right travel section is pressed.
The oil from the piston pump P1 flows through the port
P1 of the inlet section, the parallel passage, the port A5
of the right travel section and the port I of the swivel joint
to the port B of the right travel motor, so that the travel
motor is rotated.
The return oil from the port A of the right travel motor
flows back to the hydraulic oil tank through the port D of
the swivel joint, the port B5 of the right travel section, the
port T of the control valve and the return filter.
2) Forward Travel (Left)
Oil Flow from Hydraulic Pump
The oil from the piston pump P2 flows through the port
P2 of the inlet section, the port A10 of the left travel sec-
tion and the port C of the swivel joint to the port A of the
left travel motor, so that the travel motor is rotated. The
return oil from the port B of the left travel motor flows
back to the hydraulic oil tank through the port G of the
swivel joint, the port B10 of the left travel section, the
port T of the control valve and the return filter.
3) Reverse Travel (Right and Left)
Oil Flow from Hydraulic Pump
When the right or left travel lever is pulled back, the
spool of the travel section is pulled.
The oil flows in the opposite direction to the oil flow in the
forward travel operation with regard to the right or left
travel motor.
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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