Sơ đồ thủy lực máy đào CAT 320 - P2

Systems Operation

320C U Excavator Hydraulic System

Main Control Valve
SMCS - 5051
Shutdown SIS

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Product: EXCAVATOR
Model: 320C EXCAVATOR MAC
Configuration: 320C U & 320C LU Excavators
MAC00001-UP (MACHINE) POWERED BY 3066 Engine
Media Number -RENR3845-01 Publication Date -01/12/2002 Date Updated -11/12/2002

i01429715


Illustration 1 g00689383
Hydraulic schematic
(1) Stick drift reduction valve
(2) Line relief valve (stick cylinder rod end)
(3) Boom drift reduction valve
(4) Line relief valve (boom cylinder head end)
(5) Return port
(6) Main control valve
(7) Stick regeneration valve
(8) Load check valve
(9) Parallel feeder passage

(10) Straight travel solenoid valve
(11) Right travel control valve
(12) Attachment control valve
(13) Bucket control valve
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(14) Center bypass passage
(15) Boom I control valve
(16) Stick II control valve
(17) Relief valve (negative flow)
(18) Straight travel control valve
(19) Relief valve (negative flow)
(20) Negative flow control orifice
(21) Boom II control valve
(22) Stick I control valve
(23) Center bypass passage
(24) Swing control valve
(25) Left travel control valve
(26) Load check valve
(27) Boom regeneration valve
(28) Line relief valve (boom cylinder rod end)
(29) Negative flow control orifice
(30) Line relief valve (stick cylinder head end)
(31) Variable swing priority valve
(32) Main relief valve
(33) Stick unloading valve
(34) Line relief valve (bucket cylinder rod end)
(35) Line relief valve (bucket cylinder head end)
(36) Parallel feeder passage

(37) Inlet port (left pump)
(38) Negative flow control line (left pump)
(39) Inlet port (right pump)
(40) Negative flow control line (right pump)
(41) Left pump
(42) Pilot pump
(43) Right pump
(44) Hydraulic tank


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Illustration 2 g00689563
Main control valve ports
(AR1) Right travel control valve (REVERSE TRAVEL)
(AR2) Attachment control valve (port)
(AR3) Bucket control valve (BUCKET CLOSE)
(AR4) Boom I control valve (BOOM LOWER)
(AR5) Stick II control valve (STICK IN)
(BR1) Right travel control valve (FORWARD TRAVEL)
(BR2) Attachment control valve (port)
(BR3) Bucket control valve (BUCKET OPEN)
(BR4) Boom I control valve (BOOM RAISE)
(BR5) Stick II control valve (STICK OUT)
(AL1) Left travel control (REVERSE TRAVEL)
(AL2) Swing control valve (SWING LEFT)
(AL3) Stick I control valve (STICK IN)
(AL4) Boom II control valve (BOOM RAISE)

(BL1) Left travel control valve (FORWARD TRAVEL)
(BL2) Swing control valve (SWING RIGHT)
(BL3) Stick I control valve (STICK OUT)
(aR1) Pilot port at right travel control valve (REVERSE TRAVEL)
(aR2) Pilot port at attachment control valve
(aR3) Pilot port at bucket control valve (BUCKET CLOSE)
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Introduction
(aR4) Pilot port at boom I control valve (BOOM LOWER)
(aR5) Pilot port at stick II control valve (STICK IN)
(aL1) Pilot port at left travel control valve (REVERSE TRAVEL)
(aL2) Pilot port at swing control valve (SWING LEFT)
(aL3) Pilot port at stick I control valve (STICK IN)
(aL4) Pilot port at boom II control valve (BOOM RAISE)
(bR1) Pilot port at right travel control valve (FORWARD TRAVEL)
(bR2) Pilot port at attachment control valve
(bR3) Pilot port at bucket control valve (BUCKET OPEN)
(bR4) Pilot port at boom I control valve (BOOM RAISE)
(bR5) Pilot port at stick II control valve (STICK OUT)
(bL1) Pilot port at left travel control valve (FORWARD TRAVEL)
(bL2) Pilot port at swing control valve (SWING RIGHT)
(bL3) Pilot port at stick I control valve (STICK OUT)
(bL4) Pilot port at boom II control valve (STICK IN)
(DST) Drain port (straight travel control valve)
(HL) Negative flow signal pressure port (left pump)
(HR) Negative flow signal pressure port (right pump)
(Pi1) Pilot port (boom regeneration valve)
(Pi2) Pilot port (stick regeneration valve)

(Pi3) Pilot port (variable swing priority valve)
(Pi4) Pilot port (straight travel solenoid valve)
(R2) Return port
(R3) Return port




Illustration 3 g00749165
(10) Straight travel solenoid valve
(11) Right travel control valve
(12) Attachment control valve
(13) Bucket control valve
(15) Boom I control valve
(16) Stick II control valve
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Main control valve (6) is located in the hydraulic system between the main pumps and actuators (cylinders and motors). Depending on the
machine operation, the oil flow from right pump (43), left pump (41) and pilot pump (42) to the hydraulic circuits are controlled by the
operation of each component in the main control valve. By this control, the speed and direction of the cylinders and the motors can be
controlled and adjusted. The pump delivery pressure can be controlled and adjusted.
The main control valve includes right body (46) and left body (45). The main control valve is coupled together with bolts in order to make one
assembly.
1. The right travel control valve (11), attachment control valve (12), bucket control valve (13), boom I control valve (15) and stick II
control valve (16) are located in right body (46). The right pump oil is delivered through inlet port (39), center bypass passage (14) and
return port (5) to hydraulic tank (44). In addition, the following components are located in right body (46) .
(18) Straight travel control valve
(21) Boom II control valve
(22) Stick I control valve

(24) Swing control valve
(25) Left travel control valve
(28) Line relief valve (boom cylinder rod end)
(30) Line relief valve (stick cylinder head end)
(32) Main relief valve
(34) Line relief valve (bucket cylinder rod end)
(45) Right body
(46) Left body




Illustration 4 g00749175
Main control valve (bottom view)
(3) Boom drift reduction valve
(4) Line relief valve (boom cylinder head end)




Illustration 5 g00749176
Bottom view of main control valve
(1) Stick drift reduction valve
(2) Line relief valve (stick cylinder rod end)

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