Fault Phenomenon: Tadano rough terrain crane strong impact sensation during automatic shifting, accompanied by metallic noise.

Troubleshooting Process:
– Checked transmission fluid quality: fluid emulsified and deteriorated.
– Checked shift solenoid valves: spool action sluggish.
– Replaced transmission fluid and filter, cleaned shift valves.

Root Cause: Deteriorated transmission fluid caused abnormal response in the hydraulic control system.

Required Parts: Transmission fluid, filter.