I have a Kubota B2620. I also have a belly mower that I remove in the fall and reattach in the spring. This afternoon, I serviced the mower. I put a set of tripod coasters under each wheel of the mower to make it easier to move. Before moving the mower under the tractor, I raised the lifting arms with no problem. I put the mower under the tractor, attached the PTO and then tried to lower the lifting arms. They wouldn't budge. I removed the coasters and tried again and they still wouldn't lower. Has anyone have any suggestions on what could be going wrong?