540 Bobcat, worked fine and then I loaded on a trailer and hauled it from Mpls to Rapid City, SD (600 miles). When I went to unload it the bucket won't operate. It will very slowly raise and will also tilt down, but won't tilt up and won't lower. It was low on fluid, so I added some and changed the filter. It did get down to about 4 on the trip, but is currently around 35. I let it run for 45 minutes to see if it got better, but no luck. Any ideas? Thanks