I was asked to look at a friends zd28. He said it would only turn one direction and hadn't been run in a year. I got it running but when I try to make it move it shuts off. Not stalls, but shuts off. Like a switch is shutting it down. I checked for a seat switch and it was already bypassed. The parking brake was difficult to release. I had to pull the pedal up manually. I'm thinking its possible it might be stuck on or if there is a switch on the e brake it might be stuck. It's also possible I'm missing something simple that must be done prior to trying to move the machine. Like I said I've never run one before. Please toss out any ideas you have no matter how simple. Thanks