Where is serial number on 325C?

The serial number on a Caterpillar 325C excavator is typically located on the frame, near the front right side of the machine, often just above the track or on the upper structure. You may also find it on the engine block or near the hydraulic tank. It's usually stamped or engraved on a metal plate for durability. For exact locations, refer to the operator's manual specific to your model.