966G Wheel Loader and 972G Wheel Loader Steering System Caterpillar

This machine is equipped with the Caterpillar Monitoring System. The Caterpillar Monitoring System consists of the following components: an action alarm, a master action light, a monitoring panel with nine alert indicators for the numerous machine systems, a tachometer and a gauge display. The system continuously monitors the numerous machine systems. The alert indicators show any abnormal condition of the machine.

Illustration 1	g00487165
Caterpillar Monitoring System (1) Master action light. (2) Primary steering indicator. (3) Secondary steering indicator.

The monitoring system provides three warning categories. A Warning Category 1 requires only operator awareness. When a Warning Category 1 occurs, the monitoring system causes an alert indicator to turn on.

A Warning Category 2 needs operator response. When a Warning Category 2 occurs, the monitoring system causes one or more indicators to turn on. A Warning Category 2 also causes master action light (3) to flash.

Note: Do NOT operate the machine until the cause of the warning has been corrected.

A Warning Category 3 requires immediate shutdown of the machine systems. When a Warning Category 3 occurs, the monitoring system causes one or more alert indicators to turn on. The monitoring system also causes master action light (1) to flash. The action alarm also sounds.

When a Warning Category 3 occurs during machine operation, stop the machine immediately and engage the parking brake. Stop the engine. Investigate the cause of the warning before returning the machine to service.

For the steering system, a Warning Category 3 occurs when there is a loss of primary steering oil pressure in the system. This causes primary steering indicator (1) to turn on. The monitoring system also causes master action light (3) to flash. The action alarm also sounds.

Note: If a machine is equipped with secondary steering, and the electric secondary steering pump is activated or disabled, a Warning Category 3 occurs. This warning also causes secondary steering indicator (3) to flash.

Note: A test of the secondary steering pump and electric motor occurs after you start the engine. The test lasts for approximately three seconds. During the test, secondary steering indicator (2) flashes.

Reference: For additional information on the Caterpillar Monitoring System, refer to Service Manual, SENR1394, "Caterpillar Monitoring System".

Reference: For additional information on service codes for the steering system, refer to the Service Manual module for Testing And Adjusting, RENR2105, "966G Wheel Loader and 972G Wheel Loader Power Train", "Troubleshooting Service Codes".