320C & 320C L Excavators AMC00001-UP (MACHINE) POWERED BY 3066 Engine(SEB...
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Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: 320C EXCAVATOR AMC
Configuration: 320C & 320C L Excavators AMC00001-UP (MACHINE)
POWERED BY 3066 Engine
Systems Operation
312C, 315C, 318C, 319C, 320C, 321C, 322C, 325C, 330C and M325C Excavators Engine and
Pump Control
Media Number -RENR3814-15 Publication Date -01/11/2005 Date Updated -01/11/2005
i01931257
Switches
SMCS - 1435; 7332
Engine Speed Dial Switch
Illustration 1 g00629971
Engine Speed Dial Switch
The positions of the engine speed dial switch are designed to inform the controller about the speed that is
desired by the operator. The engine speed dial switch has ten positions: 1 to 10. Each position of the switch
has a unique combination of connector contacts that close to contact 1. A combination of contact 2 through
contact 5 will close to contact 1. This switch will ground a unique combination of inputs for the engine
speed dial switch to the controller.
One Touch Low Idle Switch
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The one touch low idle switch is incorporated into the top section of the right joystick. When the switch is in
the ON position, the engine speed is decreased to 1100 rpm.
Pressure Switch
Illustration 2 g00663092
Travel Pressure Switch And Implement/Swing Pressure Switch
Left Travel Pressure Switch, Right Travel Pressure Switch, Straight Travel Pressure
Switch and Implement/Swing Pressure Switch
The travel pressure switch and the implement/swing pressure switch will monitor the hydraulic system. This
switch is normally open. These switches will inform the controller about the status of the hydraulic
demands. When there is no hydraulic demand these switches are open. The function of the automatic engine
speed control (ECM) of the controller will use these switches to determine operation. These switches are in
the normally open position, when the switches are not installed on the machine. The implement/swing
pressure switch releases the swing brake. If the implement/swing pressure switch and the travel pressure
switch are in the closed position the swing brake will be released.
Engine Oil Pressure Switch
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Illustration 3 g00662566
Engine Oil Pressure Switch
During normal operation, the engine oil pressure switch is closed to ground. This switch is normally open.
The switch opens when engine oil pressure is less than the specified value for the switch. If the switch is in
the open position, the controller will notify the operator that the engine oil pressure is insufficient. This
switch is normally open, when the switch is not installed on the machine.
Key Start Switch
Illustration 4 g00291705
Key Start Switch
The key start switch is an input of the engine and pump controller. The key start switch informs the ECM of
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an attempt to start the engine. Then, the ECM initiates the start procedure.
During normal machine operation, the start terminal of the key start switch is open. If the key start switch is
placed in the START position the start terminal will close. +Battery voltage is supplied to the start terminal.
When all starting conditions are satisfied, the ECM sends a +battery signal to the start relay and engine
cranking begins.
Note: After the key start switch is initially turned to the START position, the switch will not return to the
START position from the ON position. The switch must be turned to the OFF position first. Then, the
switch can be turned to the START position.
Air Filter Switch
Illustration 5 g01004714
Air Filter Switch
The air filter switch will close, if the air filter is blocked with debris. This switch is normally open. A
warning will be displayed on the monitor. However, when a warning of higher priority is occurring at the
same time, the warning with the higher priority will be displayed.
Hydraulic Oil Filter Switch
When the hydraulic oil filter is clogged, the hydraulic oil filter switch will be open. A warning will be
displayed on the monitor.
Engine Coolant Level Switch
The engine coolant level switch is an electronic switch that is activated by the coolant. The coolant level
switch is closed to ground during normal operation. The switch opens when the coolant level is too low. The
open switch informs the controller that the coolant level is too low in the cooling system.
Hydraulic Level Switch and Engine Oil Level Switch
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Illustration 6 g00662559
Hydraulic Oil Level Switch
The hydraulic oil level switch monitors the hydraulic oil level after the starter key switch is held in the ON
position for 2 seconds or more. The controller checks hydraulic oil level with the switch. The switch closes
when the hydraulic oil level is below the normal operating level. This switch is in the normally open
position, when the switch is not installed on the machine.
Water Separator Level Switch
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Illustration 7 g00685243
Water Separator Level Switch
When the volume of water that has been separated by the water separator reaches a specified volume, the
switch is closed. The controller reads the input from the water separator switch. The controller will display a
warning on the monitor. The water separator should be inspected. The water separator should be drained.
Switch Panel Assembly
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Illustration 8 g00764117
Switch Panel
(1) Travel alarm cancel switch
(2) Automatic engine control switch (AEC)
(3) Two-Speed Travel Switch
Travel Alarm Cancel Switch
When the travel alarm cancel switch (1) is activated and the machine is in motion, the travel alarm will
temporarily stop until the machine has stopped. When the machine begins to travel again, the travel alarm
will sound again. The indicator will illuminate while the switch is being pressed.
Automatic Engine Control Switch (AEC)
Either "AEC 1" or "AEC 2" is set by pressing the Automatic Engine Control switch (2). The indicator will
illuminate when "AEC 2" has been selected.
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Two-Speed Travel Switch
When the two-speed travel switch (3) is pressed, the travel control is set in the position of automatic two-
speed or the position of fixed low speed. The indicator will illuminate when the position of automatic two-
speed has been selected.
Pressure Switch
Illustration 9 g00685022
Attachment Pedal Pressure Switch (Hammer)
Attachment Pedal Pressure Switch
This pressure switch is in the closed position when the attachment pedal is being operated and the pedal is
using the main pump. This switch is utilized for control of the engine speed and control of the pump. This
switch is normally open.
Copyright 1993 - 2007 Caterpillar Inc. Thu Apr 12 08:23:36 UTC+0630 2007
All Rights Reserved.
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