We have many attachments available such as sawheads, blades, canopies, cabs, log forks, backhoe attachments, buckets, and thumb assemblies.
Model: 312 314
Here is a good used caterpillar hydraulic wedge coupler with aux hydraulic lines and cab mounted control box. It came off a good working 312d excavator. Will work on the 312 and 314 cat excavators. It may work on others, but might require some modification.