POPPET AS 1234591 - Caterpillar

Illustration 5 g03620996
Attachment valves (A1 and A2) located in pump compartment (typical example)
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Attachment valves (A3) located in swing motor compartment (typical example)
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Attachment valves (A3) located in pump compartment (typical example)
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Valve cutaway, hydraulic schematic symbol, and electrical connector designation
Table 2
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C)
Illustration 9 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.Boom DOWN / Stick IN Pressure Limit Valves
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Boom DOWN / Stick IN pressure limiting valves located beneath main control valve (typical example)
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Valve cutaway, hydraulic schematic symbol, and electrical connector designation
Table 3
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C)
Illustration 12 g02304414
A - Port pressure (kPa) vs Current (mA)
The Boom DOWN and Stick IN pressure limiting valves are used on the Combined Function - Electric Control system.These proportional reducing valves electronically control spool shift pressure of the boom DOWN and stick IN control valves. This operation will allow better operability of the work tool by decreasing the boom DOWN and stick IN speed that is caused by a heavy work tool.Variable Relief Valves
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Variable relief valves located above the swing motor compartment (typical example)
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Solenoid valve, hydraulic schematic symbol, and electrical connector designation
Table 4
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)
Illustration 15 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.