26SI Series Alternator – General Information

General Hazard Information

In order to prevent injury or death, all machines that are equipped with a Caterpillar Product Link system are required to have a warning label that is clearly posted in the cab.

------ WARNING! ------

This machine is equipped with a Caterpillar Product Link communication device. When electric detonators are used, this communication device should be deactivated within 12 m (40 ft) of a blast site for satellite-based systems and within 3 m (10 ft) of a blast site for cellular based systems, or within the distance mandated under applicable legal requirements. Failure to do so could cause interference with blasting operations and result in serious injury or death.

In cases where the type of Product Link module cannot be identified, Caterpillar recommends that the device be disabled no less than 12 m (40 ft) from the blast perimeter.


If the machine is required to work within 12 m (40 ft) of a blast area, then the operator must take one of the following precautions:

  • Disconnect the Product Link module from the power source by disconnecting the wiring harness at the Product Link module.

  • Temporarily remove the Product Link module from the machine.

  • Add an ON/OFF switch in order to allow the Product Link module to be turned off from the cab.

Consult your Caterpillar Dealer if there are any questions.

This warning does not supersede the published requirements and regulations that are found in “Title 30 of the Code of Federal Regulations (CFR)”. This warning does not allow a deviation from the published requirements and regulations that are found in “Title 30 of the Code of Federal Regulations (CFR)”. Every mine operation should conduct hazard assessments. Also, every mine operation should meet all of the requirements of “Title 30 of the Code of Federal Regulations (CFR)” in order to ensure safe operation in the storage, transportation, loading, and blasting of explosives.

The following Product Link specifications are provided to aid in conducting hazard assessments and ensuring compliance with all local regulations.

Product Link Transmitter Power – 5 to 10 W

Transmit Frequency Range – 148 to 150 MHz

General Troubleshooting Information

Many Caterpillar machines have a published Electrical System Schematic that reflects a Product Link installation. Refer to these schematics if a troubleshooting procedure instructs you to “Repair the harness”. Perform continuity checks and resistance checks at the connectors in order to locate a failure in the harness. At a component connector, always check the ground circuit. Less than 5 ohms of resistance is required from the ground contacts to frame ground. A problem may be incorrectly diagnosed, if an excessive resistance that is greater than 5 ohms is present in the ground circuit. During a troubleshooting procedure, the user should inspect all component and harness connections before a component is replaced. If these connections are not clean and tight, the connection may cause an electrical problem.

The problem can be permanent or the problem may be intermittent. Ensure that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are performed. A failure of an electrical component may cause a failure of another component or a failure may be caused by the failure of other components. Always attempt to find a failure. The following test procedures are written for a technician with a working knowledge of electricity and electronics. The user should correct the cause of a failure in the electrical system before you replace a component.

The test procedures that are found in Systems Operation, Troubleshooting, Testing and Adjusting Manual are written for a technician that has a working knowledge of electricity and electronics. Caterpillar recommends that the electrician has a knowledge regarding the danger that is inherent in electrical troubleshooting. Caterpillar recommends that the technician can measure voltage and resistance with a multimeter. In some cases, a technician may perform checks of the electrical circuits. Consider the following guidelines before performing electronic troubleshooting procedures:

  • Remove power.

  • Before you read the resistance or continuity, lock out the test circuit with a tag.

  • Isolate circuit branches for resistance or continuity checks in order to prevent reading through components.

  • When reading a wire end to end and within a connector, read the test input pin to all adjacent pins for shorts within the connector locking mechanism.

  • Look for readings of high resistance during continuity checks. High resistance could indicate damage or corrosion in the circuit.

  • Keep fingers and hands clear of test leads during all electrical checks in order to prevent false indications.

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