6
. HYDRAULIC SYSTEM
6-
3-
2
9
6
-3-8
Track Gauge Change
The track gauge change lever is connected to the spool
of the control valve through linkage.
1) Widening
When the track gauge change lever is pushed forward to
widen the track gauge, the spool of the track gauge
change section is pulled.
Oil Flow from Hydraulic Pump
The oil from the piston pump P1 flows to the bottom side
(W) of the track gauge change cylinder through the port
P1 of the inlet section, the port B1 of the track gauge
change section and the port B of the swivel joint to
extend its cylinder rod, widening the track gauge.
The return oil from the rod side (N) of the track gauge
change cylinder flows back to the hydraulic oil tank
through the port A of the swivel joint, the port A1 of the
track gauge change section, the port T of the control
valve and the return filter.
2) Narrowing
When the track gauge change lever is pulled back to
narrow the track gauge, the spool of the track gauge
change section is pressed.
Oil Flow from Hydraulic Pump
The oil flows in the opposite direction to the oil flow in the
track gauge widening operation with regard to the track
gauge change cylinder.
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 117: ...6 HYDRAULIC SYSTEM 6 1 3...
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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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