INSERT 2476398 - Caterpillar

Pressure Switches
Illustration 7 g02332474
Pressure switch
Note: The values in Table 4 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 4
Actuation Pressure 490 49 kPa
Deactuation Pressure 294 kPa minimum
Rating + 12V to + 32 V DC
0.01 Amp to 1 Amp
Pressure Range 0 to 10 MPa The pilot system contains the following pressure switches:
Boom down pilot pressure switch (smart boom application only)
Swing pilot pressure switchOutputs
The ECM responds to inputs by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or service technician.On/Off Solenoids
For control of on/off type solenoids and relays, the ECM will either turn ON or turn OFF the output for a component. The output command is based on the signals from the input devices that are involved in the system. The ECM will not vary the amplitude of the output, the circuit is either energized (on) or the circuit is de-energized (off). When the on/off output circuit is energized, most often system power will be used to energize the circuit and the output component.
Illustration 8 g01158530Note: The values in Table 5 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 5
Rated Voltage 24 VDC
Coil Resistance 32.0 3.2Ω (T=20° C) The pilot system contains the following on/off solenoids:Pilot manifold integrated
Heavy lift
Implement lockout
Medium pressure/pilot pump displacement control
Oscillating axle
Swing brake
Travel direction
Transmission gear shift 1 and gear shift 2Free positioned in machine
Smart boom
Joystick steering (1st gear restriction)
Quick coupler
Blade/stabilizer activation (undercarriage)Service brake valve integrated
Auto brakeMulti combined valve integrated
Uni/bi-directional oil flowProportional Solenoid Valve
Illustration 9 g02703776Note: The values in Table 6 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 6
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C) The pilot system contains the following proportional solenoids:Pilot manifold integrated
Main pump displacement control
Swing pump power shift control
Travel pilot pressure modulation
Travel motor displacement controlFree positioned in machine
2nd high pressure circuit A (attached to main control valve)
2nd high pressure circuit B (attached to main control valve)
Joystick steering A (medium pressure valve block)
Joystick steering B (medium pressure valve block)
Medium pressure A (medium pressure valve block)
Medium pressure B (medium pressure valve block)
Multi combined valve A (auxiliary flow valve A)
Multi combined valve B (auxiliary flow valve B)
Multi combined valve A (line relief pressure A)
Multi combined valve A/B (working pressure cut-off)
Offset boom A (medium pressure valve block)
Offset boom B (medium pressure valve block)Soft Switch Panel
Illustration 10 g03708249
Soft Switch Panel
(1) Oscillating axle control button
(2) Travel speed control button
(3) Creeper speed control button
(4) Ride control button
(5) Parking brake control button
(6) Smart boom control button
(7) Overload warning enable control button
(8) Swing lock control button Pin Locations for Soft Panel Switch
Table 7
Switch Panel F-C3 Contact Connections
Pin Location Function Description
4 Swing brake solenoid On/off output
5 Auxiliary directional solenoid On/off output
7 Medium pressure pump displacement solenoid On/off output
8 Heavy lift solenoid On/off output