PISTON AS 1958293 - Caterpillar

Reference: See Special Publication, NEHS0758, "Communications Adapter II User Manual Contains Software".Note: Caterpillar Electronic Technician (Cat-ET) is a software program that can be used on an IBM compatible personal computer. In order to use the Cat-ET service tool, order the following materials: Special Publication, JERD2124, "ET Single Use Program License", Special Publication, JEHP1026, "Information and Requirements Sheet", 7X-1425 Data Link Cable and the Data Subscription and Special Publication, JERD2142, "Data Subscription". The Special Publication, JEHP1026, "Information and Requirements Sheet" lists the required hardware and the features of the Cat-ET service tool.The Cat-ET service tool is not required in order to determine the diagnostic codes. The Cat-ET service tool is also not required in order to clear the diagnostic codes. However, the process of determining the diagnostic codes is easier and faster by using the ET. The ET can also display information on the history of a diagnostic code and the parameter status of diagnostic codes. These features allow the Cat-ET service tool to be useful tool in troubleshooting.The Cat-ET service tool is used to communicate to the electronic control module over the data link by connecting to the machine diagnostic connector. For more information and the locations of the connectors, see Troubleshooting, "Electrical Components and Connector Locations" and the Electrical System Schematic in your machine Service Manual.For instructions on servicing Sure Seal connectors, see Special Instruction, SMHS7531. For instructions on servicing Deutsch DT connectors, see Special Instruction, SEHS9615.Use the digital multimeter for making continuity checks or for measuring voltage. For instructions about the use of the 6V-7070 Digital Multimeter, see Special Instruction, SEHS7734. The 7X-1710 Multimeter Probe measures the voltage at the connectors without disconnecting the connectors. The probe cables are pushed into the back of the connector along the wire. The 8T-8726 Adapter Cable has a three pin breakout connector. The adapter cable is used for measurements in the sensor circuits.Except for harness tests, the use of certain test equipment is not recommended for use on modern Caterpillar electrical circuits. Such testers include the following examples: the 8T-0500 Continuity Tester and 5P-7277 Voltage Tester.Note: A procedure has been developed to test "In Cylinder" Position Sensors. Reference Special Instruction REHS7338, "Procedure to Test the Position Sensor of a Hydraulic Cylinder". Service Switches
During troubleshooting, use of the diagnostic operations of the Caterpillar Monitoring System is necessary. Service personnel must use the service switches in order to access the different display modes of diagnostic operation. The switches are the momentary type of switch. The service personnel activate the switches by pressing and holding. Pressing the clear switch grounds the clear input (contact 33) of the monitor. Pressing the set switch grounds the service switch (contact 23) of the monitor. The location of the service switches will vary depending on the machine that is being serviced. Not all machines are equipped with service switches. For a more accurate location of the service switches, see the Electrical System Schematic in the Service Manual for the