The 953D doesn't have bogie-suspended undercarriage so it's bound to be a bit of a hard ride on anything other than really soft material. What sort of ride were you expecting and what other machines are you comparing it to when you say you are disappointed with the ride..?
Unless you have a photo that shows different it doesn''t have rubber-suspended bogies supporting the track rollers. Does it by any chance have SystemOne undercarriage on it and did your last machine have the same type of tracks or did it have "normal" heavy-duty tracks..?
Also is there any difference in the seat suspension between your former machine and the new one..?
I think perhaps you are running on harder ground then you were with the 953C? I don't know how you operators can run these machines for a full shift, they are smooth on soft ground or on the garbage in a landfill, but on hard or frozen ground I can feel my teeth wanting to fall out. I would never want to run one for a living that's for sure.The roller frames do bogie . Regular undercarriage no system one .all of the rear engine highlight bogie they are not solid like 955/977. It has air ride seat,but it will beat u do death!