Quick hitches can improve productivity, by saving time swapping between attachments. They can reduce wear, by not introducing dirt and grit into the bushes when replacing pins. They also make it safer and easier for the operator by not having to man handle the buckets.
You can fit a quick hitch to an existing digger with pin on buckets, by fitting dummy pins to each bucket. There are several options available to you. You can go for a spring type manual coupler, a dedicated hitch system like the Klac system or you can go for an hydraulic hitch system once you get above 2.6 ton.
If you wish to discuss this in any further detail, please call David.