CORE AS-RADIATOR 1273436 - Caterpillar

Attachment Valves
Medium Pressure
Illustration 1 g02304454
Attachment valves located in swing motor compartment (typical example)
Illustration 2 g02304193
Valve cutaway, hydraulic schematic symbol, and electrical connector designation
Table 1
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C) Note: The values in Table 1 are for bench testing only. Values may not represent parameters for machine systems specifications.
Illustration 3 g02263554
A - Port pressure (kPa) vs Current (mA)
The proportional reducing valves electronically control the spool shift pressure for the attachment control valves. These valves make available of control of attachment control valve by electric control input or hydraulic control input. Operation of the work tool is enhanced because the spool shift pressure is controlled in accordance with operator control input.Variable Relief Valves
Illustration 4 g03810725
Variable relief valves located above the swing motor compartment (typical example)
Illustration 5 g02304476
Solenoid valve, hydraulic schematic symbol, and electrical connector designation
Table 2
Max Flow Rate 400 L/min
P-Port Pressure Range 980 kPa to 37700 kPa
Current Range 0 mA ~ 1500 mA
Coil Resistance 6.4 Ω (T=20° C) Note: The values in Table 2 are for bench testing only. Values may not represent parameters for machine systems specifications.
Illustration 6 g03354830
P - Port pressure (kPa) vs Current (mA)
The proportional solenoid valve for variable relief is controlled directly by the machine ECM. When the ECM determines the requirements for relief pressure to the work tool, the ECM sends varying signals to the solenoids. Two of these solenoids are used to control relief pressure to the work tool for both one-way flow and two-way flow. The variable relief valves are used to control the oil flow sending oil to the return system for one-way flow.Extend and Retract PHMV
Illustration 7 g03365829
IMV section cutaway
Illustration 8 g03366029
Proportional Hydraulic Modulation Valve
Table 3
Rated Voltage 24 V
Coil Resistance 5 0.3Ω (T=25° C)
5 0.3Ω (T=25° C)
Current 1.9 amp (max) Note: The values in Table 3 are for bench testing only. Values may not represent parameters for machine systems specifications.
Illustration 9 g03365887The Extend and Retract (PHMV) position is controlled by the ACS valve ECM. IMV PHMV position is based off various inputs and hydraulic demand.