Fault Phenomenon: Heli CPCD30 diesel forklift engine RPM is normal, but the mast lifting speed is extremely slow, accompanied by abnormal noise, unable to lift full load.

Troubleshooting Process:
– Checked hydraulic oil level: level low.
– Checked suction filter: severely clogged.
– Checked multi-way valve: spool moves freely.
– Measured hydraulic pump outlet pressure: pressure below standard.

Root Cause: Severe internal leakage of the hydraulic pump, or clogged suction filter causing insufficient oil supply.

Required Parts: Hydraulic pump repair kit or suction filter.