I just backed my F350 into garage, angled blade, it won't angle back. Called driver for that truck asked him how it worked, he said fine-no problems. The last site he was at had concrete curbs, wondering if check valve got stuck. Pump is an under the hood haynes, bran new that was first storm on it. HELP, were supposed to get 12+inches over next couple days, if I don't get it fixed I'll be in truck 12 hrs per run, figuring on three runs.