Fault Phenomenon: Yale electric trolley travel wheels show severe uneven wear after 3 months of use.

Troubleshooting Process:
– Checked rail: rail not straight.
– Checked wheel spacing: improper wheel spacing adjustment.
– Checked bearings: bearing damage causing wheel misalignment.
– Straightened rail, replaced bearings, adjusted wheel spacing.

Root Cause: Travel wheel bearing damage caused the wheel to run tilted.

Required Parts: Travel wheel bearings, travel wheels.