Fault Phenomenon: Caterpillar AP655D paver when lifting the screed, the left and right sides are at different heights.

Troubleshooting Process:
– Checked flow divider motor: flow synchronization motor worn.
– Checked cylinders: one cylinder has internal leakage.
– Checked check valves: make-up check valves stuck.
– Checked mechanical: guide posts sticking.

Root Cause: The flow synchronization motor (gear divider) in the screed lift circuit is worn, causing unequal flow distribution to the two cylinders.

Required Parts: Replace flow synchronization motor assembly.