2015 X738. I take off the hydraulic arms in the winter to put on my snowblower. After reinstalling arms I am having a hard time installing the mower deck. The quick connect on the tractor is snug on the gearbox insert of the mower deck. However, The hydraulic arms of the tractor are not locking into place on the deck. The deck is flat on the ground and the hydraulic lever is down in the instal position. I think it may be a problem with the locking arm on the deck. It will not stay in the "open" position and i am unable to line up the hydraulic arms to lock in place. Has anyone had this issue? I would really appreciate the help!