Fault Phenomenon: Kalmar heavy forklift when turning, the hydraulic pump emits a loud whining sound, steering action sluggish.

Troubleshooting Process:
– Checked hydraulic tank oil level: level too low.
– Checked suction filter: filter clogged.
– Checked hydraulic oil viscosity: viscosity too high.
– Checked pump coupling: coupling damaged.

Root Cause: Low hydraulic tank oil level causes pump cavitation and noise.

Required Parts: Hydraulic oil and suction filter.