Fault Phenomenon: MacGregor hatch cover crane when opening the hatch cover, the two hydraulic cylinders move at different rates, causing the cover to jam.

Troubleshooting Process:
– Checked synchronization motor: synchronization motor internal leakage.
– Checked flow control valves: valve ports clogged.
– Checked load: significant load difference between sides.
– Replaced synchronization motor, cleaned valve block.

Root Cause: The hydraulic synchronization motor had internal leakage, causing uneven flow distribution.

Required Parts: Hydraulic synchronization motor.