Fault Phenomenon: Sinoboom GTJZ16 scissor lift aerial work platform when overloaded, the safety valve does not open, causing structural damage.

Troubleshooting Process:
– Checked set pressure: pressure set too high.
– Checked spool: spool seized.
– Checked spring: spring broken.
– Checked for contaminants: debris stuck.

Root Cause: The safety valve spool is seized or the set pressure is incorrect.

Required Parts: Safety valve assembly and resetting.