It was only -32 here today with wind chill. Was feeding this morning and hydraulics were getting slower and slower do to wind chill and loader quit raising and next grapple quit closing. Put the tractor in shop all day still won't work properly. Loader will raise once and will go down but won't come back up. Grapple will close once or twice then will open but not close. If tractor is off for awhile the sequence starts all over again. Any ideas?