TUBE 1806389 - Caterpillar

prelubrication function uses an electric pump to lubricate the engine before starting. This will reduce engine wear.An electronic engine control is used to energize the prelubrication pump. The transmission ECM will tell the engine control in order to activate the prelubrication system. The prelubrication function can be enabled or disabled by using a service tool. The service tool can program the desired state into the electronic engine control.When the operator turns the key start switch to the start position, the ECM will then attempt the prelubrication function. The ECM will command the engine control to start the prelubrication function. This status is sent from the engine control. The ECM will not allow the machine to start until the prelubrication function is complete.The pump that is used for the prelubrication function is also used for the secondary steering function and the Quick Evac function. Any time the prelubrication pump is energized, the secondary steering pump will activate. See Systems Operation, "High Speed Oil Change System (Quick Evac)"and Systems Operation, "Electronic Control Module" for additional information.Note: The key start switch must be held in the crank position. This will start the prelubrication function. If the key start switch is released during the prelubrication function, the prelubrication function will be terminated. When the prelubrication function is complete, the ECM will start the engine.