DH borrowed the neighbor's tractor to bush hog around the pasture and move his big Lincoln welder onto a trailer. Everything went fine bush hogging and he even used the front bucket to push some limbs into a pile. When he brought the tractor down to the barn and raised the front end loader up it will no longer move. He can't get the front end loader to go up or down. The tractor still moves and the bush hog still works, but the bucket stays all the way up. The tractor is a John Deere tractor with the number 2150 on the side. The neighbor is out of town and we have NO way to ask him what to do, or how to get the front end loader lowered. Any suggestions???