Fault Phenomenon: Manitou 140ATJ articulating boom aerial work platform engine runs, but the hydraulic pump does not work, no hydraulic action.

Troubleshooting Process:
– Checked pump shaft: shaft not turning.
– Checked coupling: coupling elastic element shattered or broken.
– Checked spline: spline worn.
– Checked installation: misalignment.

Root Cause: The coupling between the engine and the hydraulic pump is broken, preventing power transmission.

Required Parts: Hydraulic pump coupling assembly.