Fault Phenomenon: Linde E16 electric forklift travels significantly slower even with full battery, struggles on slopes, and eventually stops.

Troubleshooting Process:
– Checked battery charge: display shows 100%.
– Checked drive motor carbon brushes: brush length normal, good contact.
– Checked accelerator pedal: signal output linear.
– Measured motor controller temperature at operating temperature: found controller overheating protection activated.

Root Cause: The drive motor controller cooling fan has failed, causing the module to overheat and limit current.

Required Parts: Controller cooling fan or controller assembly.