Sơ đồ thủy lực máy đào CAT 320 - P6
Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (44.84 KB, 4 trang )
Systems Operation
320C U Excavator Hydraulic System
Return Hydraulic System
SMCS - 5050
Shutdown SIS
Previous Screen
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
i01429732
Page 1 of 4320C U & 320C LU Excavators MAC00001-UP (MACHINE) POWERED BY 3066 Engine(S
...
18/03/2002mhtml:file://C:\V-Trac\Phu tung,bao duong\Schematic\Hydraulic sys\Return Hydraulic Syste
...
Illustration 1 g00749838
(1) Swing motor
(2) Travel motors
(3) Case drain line
(4) Case drain line
(5) Makeup line (makeup oil to swing motor)
(6) Return line
(7) Return passage
(8) Return line
Page 2 of 4320C U & 320C LU Excavators MAC00001-UP (MACHINE) POWERED BY 3066 Engine(S
...
18/03/2002mhtml:file://C:\V-Trac\Phu tung,bao duong\Schematic\Hydraulic sys\Return Hydraulic Syste
...
The oil delivery from right pump (21) and left pump (20) enters main control valve (10). The
oil then flows to return passage (7) and return line (6) in one of the following manners.
When all joysticks and/or travel levers/pedals are in the NEUTRAL position, pump low
pressure standby oil from right pump (21) flows through center bypass passage (11) and
negative flow control orifice (12) to return line (6). Pump low pressure standby oil from left
pump (20) flows through center bypass passage (15) and negative flow control orifice (13) to
return line (8) .
When any one of the joysticks and/or travel levers/pedals is shifted from the NEUTRAL
position, center bypass passages (11) and (15) are blocked. The return oil from the cylinders
and/or motors now flows through return passage (9) to return line (8) .
The return oil from return line (6) and return line (8) flows through return line (16) and slow
return check valve (17) .
(9) Return passage
(10) Main control valve
(11) Center bypass passage
(12) Negative flow control orifice
(13) Negative flow control orifice
(14) Case drain line
(15) Center bypass passage
(16) Return line
(17) Slow return check valve
(18) Hydraulic oil cooler
(20) Left pump
(21) Right pump
(22) Pilot pump
(23) Case drain filter
(24) Bypass check valve
(25) Hydraulic tank
(26) Case drain line
(27) Suction line
Page 3 of 4320C U & 320C LU Excavators MAC00001-UP (MACHINE) POWERED BY 3066 Engine(S
...
18/03/2002mhtml:file://C:\V-Trac\Phu tung,bao duong\Schematic\Hydraulic sys\Return Hydraulic Syste
...
When the oil temperature is very low, most of the oil is returned through bypass check valve
(24) to hydraulic tank (25). The remainder of the oil flows into oil cooler (18) to hydraulic
tank (25) .
When the oil temperature increases, the rate of oil flow through bypass check valve (24)
decreases. This causes the rate of oil flow through oil cooler (18) to increase.
Reference: For more information concerning the bypass check valve, refer to Systems
Operation, "Bypass Valve (Return)".
Case drain oil from right pump (21), left pump (20) and pilot pump (22) flows into case drain
line (26). Case drain oil from swing motor (1) and travel motors (2) flows into respective case
drain lines (3) and (4). The case drain oil from the motors flows through case drain line (14)
and combines with the case drain oil from the pumps at case drain line (26). All of the case
drain oil from the pumps and the motors now flows through case drain filter (23) to hydraulic
tank (25) .
Makeup line (5) will route return oil to the inlet port of the swing motor if a vacuum condition
occurs at the swing motor during swing stop.
For more information concerning the makeup operation of the return hydraulic system at the
swing motor, refer to the following sections in this manual.
z
Systems Operation, "Check Valve (Return Makeup)"
z
Systems Operation, "Oil Makeup (Swing System)"
z
Systems Operation, "Relief Valve (Swing)"
Copyright 1993 - 2007 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Mon Mar 18 14:48:34 UTC+0700 2002
Page 4 of 4320C U & 320C LU Excavators MAC00001-UP (MACHINE) POWERED BY 3066 Engine(S
...
18/03/2002mhtml:file://C:\V-Trac\Phu tung,bao duong\Schematic\Hydraulic sys\Return Hydraulic Syste
...
