BODY A. 5K2445 - Caterpillar

Engine Start Switch
Illustration 12 g06192996
Engine Start Switch
(A) Off
(B) On
(1) Engine Start Switch
(2) Start ButtonTo activate the electrical circuits in the cab and enable engine starting, turn the engine start ring (1) clockwise to the ON position (B). To start the engine, press the start button (2). After the engine starts, release the button. Turn the engine ring (1) to the OFF position (A) to stop the engine. Pressing the start button (2) with the engine on will also turn off the engine.Power Mode Selection
The Power Mode Setting screen in the monitor allows the operator to choose what default power mode to operate the engine. Push in the engine speed dial to change the power mode. The status indicator area of the monitor indicates what power mode the machine will operate. The power modes available are
Smart Mode
Economy Mode
Power Mode
Smart Mode - This indicator shows that the machine is set to operate in the SMART mode.
Economy Mode - This indicator shows that the machine is set to operate in the Economy mode.
Power Mode - This indicator shows that the machine is set to operate in the Power mode.Outputs
The ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician.Solenoids
On/Off Solenoids
Illustration 13 g06191494Note: The values in Table 8 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 8
Rated Voltage 24 VDC
Coil Resistance 32.5 1.6Ω (T=20° C) The On/Off solenoids include:
Swing brake solenoid
Travel speed solenoid
Straight travel solenoid
Hydraulic lock solenoidProportional Reducing Solenoid Valve
Illustration 14 g06191521Note: The values in Table 9 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 9
Rated Voltage 12 VDC
Coil Resistance 8.15 0.4Ω (T=20° C)
Illustration 15 g06237029
A - Port pressure (kPa) vs Current (mA)
The proportional reducing solenoid valve is used on machines equipped with tool control. The P-Port is blocked and does not allow pressure to the A-port. Therefore, the machine ECM must apply current to the PRV to sent pressure to the A-port of the PRV.The PRV's include:The proportional reducing solenoid in Illustration 14 includes:
Boom 1 Up Solenoid
Boom 1 Down Solenoid
Bucket Close Solenoid
Bucket Open Solenoid
Boom 2 Up Solenoid
Left Travel Forward Solenoid
Left Travel Backward Solenoid
Right Travel Forward Solenoid
Right Travel Backward Solenoid
Stick 1 In Solenoid
Stick Out Solenoid
Stick 2 In Solenoid
Stick Unload Solenoid
Swing Left Solenoid
Swing Right Solenoid
Swing Priority SolenoidData Link
The data link is a controller network used to pass information back and forth. The data link is designed to carry communications between the various controllers and the monitor. The data link is not a visible component. The network consists of internal control circuits and a wiring harness. The data link is bidirectional. The controllers can receive information and send information. Two 120 Ohm terminating resistors must be installed in the wiring harness in order for each data link to function properly.An example of how the data link works would be the fuel level information. The fuel level sensor is connected to machine ECM 1. The