NH 425 Hydraulic question

[Dirttracker30]

I had all the filters and fluids changed in my 425 . And now if I run it for a couple of hours , the controls seem to get harder and stiffer , more jumpy to run. It never done it previously, and all fluids are correct dextrin etc. ,and dine by a guy that retired from his family ag store that sold and serviced tractors and equipment for years. He did say he adjusted something in the steering linkages under the seat so it would be more neutral between the steering sticks . I'm wondering if there is something there that he adjusted wrong that after a while is making things work against each other or getting the fluid hot etc. Any thoughts. Supposed to get snow tommorrow ????????

 

[flyerdan]

I can't think of a reason a neutral adjust would cause that problem, it would just keep it from creeping and make it easier to start when cold.
Is the oil foamy? A seal on a filter might have pinched and allow air to be sucked in which could cause some issues.
If everything looks fine, when it acts up lift the front wheels with the bucket and see if it goes away; if a tire has wear or is a different brand it could be a slightly different circumference which can cause a binding if the surface doesn't allow enough slippage.