Systems Operation

320C U Excavator Hydraulic System

Main Hydraulic Pump
SMCS - 5070
Construction
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

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)

(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 Page 3 of 5320C U & 320C LU Excavators MAC00001-UP (MACHINE) POWERED BY 3066 Engine(S
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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.

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