3 - 12
When the right control lever is pulled back, the boom spools in the main control valve are moved to
the raise position by the pilot oil pressure from the remote control valve.
The oil from the front and rear pump flows into the main control valve and then goes to the large
chamber of boom cylinders.
At the same time, the oil from the small chamber of boom cylinders returns to the hydraulic oil tank
through the boom spool in the main control valve. When this happens, the boom goes up.
The excessive pressure in the boom cylinder bottom end circuit is prevented by relief valve.
When the boom is raised and the control lever is returned to neutral position, the circuit for the
holding pressure at the bottom end of the boom cylinder is closed by the boom holding valve.
This prevents the hydraulic drift of boom cylinder.
1. BOOM RAISE OPERATION
BOOM2
TRAVEL MOTOR
ARM CYLINDER
BOOM CYLINDER
SWING MOTOR
HYD
TANK
FRONT
PUMP
REAR
PUMP
PILOT
PUMP
P1
P2
R
XBb2
BOOM1
MAKE UP VALVE
RELIEF VALVE
XAb1
dr4
P1
Bb1
XBb1
XBb2
BUCKRT CYLINDER
BOOM HOLDING
VALVE
GROUP 4 SINGLE OPERATION
Summary of Contents for R 160 LC-3
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Page 182: ...4 44 No of pin Receptacle connector Female Plug connector Male 24 12 24 1 13 S815 024000...
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Page 416: ...8 103 Remove lock nut 21 and then boot 26 15...
Page 427: ...8 114 Install cover 3 to hub 1 and tighten bolts 14 Torque 5 5 12 5kgf m 40 90lbf ft 7 14 15 3...
Page 456: ...8 143 1 STRUCTURE GROUP 11 WORKEQUIPMENT SECTION A SECTION B SECTION C C B B A A C...