Fault Phenomenon: Caterpillar AP555F paver centralized lubrication system does not pump grease, lubrication points have no grease.

Troubleshooting Process:
– Checked power supply: pump motor power circuit open.
– Checked grease tank: grease bucket empty.
– Checked controller: timer setting incorrect.
– Checked lines: main line ruptured, pressure relief.

Root Cause: The auto-lubrication pump motor carbon brushes are worn, or the internal relay in the controller is damaged, preventing pump startup.

Required Parts: Replace lubrication pump motor or controller.