We have put together a short video to compare the all new JCB Agriculture TM420 with the TM320S.
The video points out the heavy duty headstock, and if you look carefully you may be able to spot some of these other differences:
100mm height difference
300mm length difference
3/4" hydraulic hoses (1/2" hoses on the TM320S)
7200kg tear out force (6260kg on the TM320S)
30% bigger pins
Heavy duty axles
