Fault Phenomenon: John Deere 772G grader high resistance during blade swing, motor overheating.

Troubleshooting Process:
– Checked grease: grease in ring gear hardened.
– Checked lubrication: auto-lube system line clogged.
– Checked temperature: long-term high-temperature operation accelerated grease oxidation.
– Checked seals: dust cover failed, water ingress emulsifying grease.

Root Cause: The grease in the blade swing ring gear was not replaced for a long time and hardened due to heat, losing its lubricating property and causing high friction resistance.

Required Parts: Thoroughly remove old grease and apply new high-temperature grease.