PIPE AS 2771150 - Caterpillar

Pump Displacement Sensor
Illustration 6 g03235271
Illustration 7 g03235722Note: The values in Table 6 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 6
Rotational Range 24.15° Angular Rotation
Output Signal 500 100 Hz
Output PWM 8% - 92%
Rating + 7V ~ +12V DC Switches
Pressure Switch
Illustration 8 g02332474Note: The values in Table 7 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 7
Activation Pressure 490 49 kPa (71 7 psi)
Deactivation Pressure 294 kPa (43 psi) MIN
Rating + 12V ~ +32V
0.01 Amp to 1 Amp
Pressure Range 0 to 10 MPa Left Travel Pressure Switch and Right Travel Pressure Switch
The left travel pressure switch and right travel pressure switch detects a travel operation. The travel pressure switches send an input signal to the machine ECM. The machine ECM uses the switch information to control the engine speed and pump control.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 9 g01158530Note: 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 32.0 3.2Ω (T=20° C) Travel Speed Solenoid
The travel speed solenoid is an output of the Machine ECM. When the travel speed solenoid is active, the machine can travel at high speed. The travel speed solenoid is active when the travel speed mode switch is set to "RABBIT (high)" mode. The travel speed also depends on the delivery pressure of the main pump. If the delivery pressure of the main pump is high, the travel speed solenoid is de-energized. When the delivery pressure of the main pump is low, the travel speed solenoid is energized.Hydraulic Lock Solenoid
The hydraulic lock solenoid is an output of the Machine ECM. The hydraulic lock solenoid is energized in order to enable the primary hydraulic pressure. The hydraulic lock solenoid is de-energized in order to disable the primary hydraulic pressure.This solenoid is activated while the key switch is in the ON position and the hydraulic lock lever is in the UNLOCK position.Data Link
Cat Data Link
The Cat Data Link is an input/output of the ECM. The data link uses the connector for the service port in order to communicate with the Caterpillar Electronic Technician. A data link connection is provided for the product link.Note: The control for the product link provides a global positioning system for the machine.The data link is bidirectional. The bidirectional link allows the ECM to input information and output information. The data link consists of the following parts: internal ECM circuits, the related harness wiring, the service tool connector, and the connector for the product link. The Cat Data Link connects to the ECM at contact J2-16 (wire 892-BR(Brown)) and contact J2-25 (wire 893-GN(Green)).
The ECM receives commands from the Cat ET in order to change the operating modes. The Cat ET will read the service codes that are