Sơ đồ thủy lực máy đào CAT 320 - P4
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Systems Operation
320C U Excavator Hydraulic System
Main Hydraulic Pump
SMCS - 5070
Construction
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
i02711454
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Illustration 1 g00875232
Main pumps
(1) Proportional reducing valve (power shift pressure)
(2) Case drain port
(3) Outlet port (right pump)
(4) Outlet port (left pump)
(5) Outlet port (pilot pressure)
(6) Port (negative flow control pressure for right pump)
(7) Port (power shift pressure for right pump)
(8) Port (pilot oil to proportional reducing valve)
(9) Housing
(10) Port (pressure sensor)
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The main pumps consist of right pump (13) and left pump (15) . The right pump and the left
pump are contained in an integral housing. Both pumps are variable displacement piston
pumps. The right pump and the left pump are identical in construction and operation.
Supply oil from the hydraulic tank enters inlet port (14) . The single inlet port is common to
both pumps. The right pump delivers oil through outlet port (3) . The left pump delivers oil
through outlet port (4) . Supply oil for pilot pump (71) enters through inlet port (11) . The pilot
pump delivers oil through outlet port (5) .
Both the right pump and the left pump have a regulator as part of the pump control system.
The flow control of the pumps is performed by the operation of the regulators. The control
system is identical for both pumps.
Proportional reducing valve (1) for the power shift pressure is located in the right pump
regulator. The proportional reducing valve is controlled by the engine and pump controller.
The proportional reducing valve controls the power shift signal for both the right pump and the
left pump.
Negative flow control pressure from the main control valve enters the right pump regulator at
port (6) . Negative flow control pressure from the main control valve enters the left pump
regulator at port (17) .
Case drain oil from the pump housing flows from port (2) to the case drain filter.
Operation
(11) Inlet port (pilot pump)
(12) Port (pressure sensor)
(13) Right pump
(14) Inlet port (supply oil from the hydraulic tank)
(15) Left pump
(16) Port (power shift pressure for left pump)
(17) Port (negative flow control pressure for left pump)
(71) Pilot pump
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Illustration 2 g00680303
Main pumps (sectional view)
(4) Outlet port (left pump)
(9) Housing
(14) Inlet port (supply oil from the hydraulic tank)
(15) Left pump
(18) Gear
(19) Drive shaft
(20) Swashplate
(21) Drive shaft
(22) Gear
(23) Plate
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Gear (22) of drive shaft (21) meshes with gear (18) of drive shaft (19) . Gear (18) and gear
(19) have the same number of teeth. Drive shaft (21) of right pump (13) is connected to the
engine by a coupling. When the engine is running, drive shaft (19) and drive shaft (21) rotate
at the same speed. Therefore, right pump (13) and left pump (15) rotate at the same speed.
Barrel (28) contains nine pistons (27) . Piston slippers (25) are connected to pistons (27) by
retainers (24) . The piston slippers are pressed against plate (23) . Plate (23) lies on swashplate
(20) . Barrel (28) is splined to drive shaft (21) . As drive shaft (21) rotates, the barrel, the
pistons and the piston slippers rotate around swashplate (20) .
The angle of swashplate (20) determines the length of stroke of piston (27) . As the angle of
the swashplate increases, the length of stroke of the pistons increases and the output flow of
the pump increases. As piston slipper (25) rotates around the swashplate, the piston moves out
of barrel (28) . The piston draws oil from passage (30) of port plate (29) during this movement.
As the piston slipper continues to rotate around the swashplate, the piston moves into the
barrel. The piston delivers oil to outlet port (5) during this movement. The oil delivery from
ports (4) and (5) flows to the main control valve.
(24) Retainer
(25) Piston slipper
(26) Pin
(27) Piston
(28) Barrel
(29) Port plate
(30) Passage
(70) Port block
(71) Pilot pump
Copyright 1993 - 2007 Caterpillar Inc.
All Rights Reserved.
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Mon Mar 18 14:36:32 UTC+0700 2002
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