Fault Phenomenon: Liebherr tower crane during jacking and adding sections, the jacking cylinder thrust is insufficient, unable to lift the upper structure.

Troubleshooting Process:
– Checked jacking pump station pressure: pressure set too low.
– Checked counterbalance valve: counterbalance valve opening pressure too high.
– Readjusted pump station relief valve pressure to specified value.

Root Cause: Incorrect pressure setting of the jacking hydraulic system relief valve.

Required Parts: None (requires adjustment).