374F and 390F Excavators Tool Control System System Identification Caterpillar


System Identification
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1.1. System Identifiers
2.2. Combined Function - Electric Control
3.2. One-Way / Two Pumps - Electric Control
4.2. Medium Pressure Hydraulic System

Use the following information to identify the tool control system on the machine.

Component configuration per the name of the tool control system is described in Table 1.

Table 1
Identification for the Tool Control System 
Tool Control System  Engineering Nomenclature  Machine Application(1)  Control Device  Tool Relief Valve  Comparable E-Series Tool Control System 
Combined Function with Medium Pressure - Electric Control  Tool A0M  "Multi-Proc - Electrical"  Electric Control(2)  Electric  Tool 20 
Combined Function without Medium Pressure - Electric Control  Tool A0  "Common Electrical"  Electric Control(2)  Electric  Tool 20 
One Way - Two Pumps - Electric Control  Tool A1  "Hammer Electrical"  Electric Control(2)  Mechanical  Tool 21 
Medium Pressure  Medium Pressure  "Front Pump - Electrical"  Electric Control  Mechanical  Medium Pressure 
(1) Monitor Setup Option > "Service" > "Configurations" > "Aux Hyd Attachment" > "Machine Application"
(2) Joystick with Thumb Wheel, Electric Foot Pedal

System Identifiers

The tool systems can be identified based on the number and type of components on the machine.

Combined Function - Electric Control

A machine configured with a Combined Function with Electric Control will have the following components:

  • Two variable relief valves located in the swing motor compartment above the boom foot.

  • Attachment independent metering valve (IMV) on top of main control valve

  • ACS ECM 3 located on the main control valve

  • Electric controls in the cab

Refer to Illustrations 1, 2, and 3 for component descriptions.



Illustration 1g03587125
Two Variable Reliefs located above the boom foo (typical examples)


Illustration 2g03584745
Attachment IMV section and attachment ECM 3


Illustration 3g03583340
Electric Control in the cab
(A) Joysticks with thumb wheel
(B) Left hand electric foot pedal
(C) Right hand electric foot pedal

One-Way / Two Pumps - Electric Control

A machine configured with a One-Way flow from Two Pumps with Electric Control will have the following components:

  • One mechanical relief valve located in the swing motor compartment above the boom foot.

  • Electric controls in the cab

Refer to Illustrations 4 and 5 for component descriptions.



Illustration 4g03618842
Mechanical Tool Relief located above the boom foot


Illustration 5g03583249
Electric Controls in the cab
(A) Joysticks with thumb wheel
(B) Left hand electric foot pedal
(C) Right hand electric foot pedal

Medium Pressure Hydraulic System

A machine configured with a Medium Pressure system is only found on machines with Combined Function with Electric Control and will have the following components:

  • Medium Pressure control valve located in the swing motor compartment.

  • Two proportional reducing valves located in front of the medium pressure control valve.

  • Electric control in the cab.

Refer to Illustration 6 and 7 for component descriptions.



Illustration 6g03587165
Medium pressure valve with proportional reducing valves for control located in the swing motor compartment attached to the hydraulic tank


Illustration 7g03584108
Electric Control in the cab
(A) Joysticks with thumb wheel
(B) Left hand electric foot pedal

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