Sounds like you sure have something wired wrong. The start capacitor has 2 'U' terminals. The blue wires go to one and the red wires go to the other. Doesn't matter which. The white wire goes to a terminal with other neutral wires. Did you remove any other wires?

Remove the chain and see if it will operate, it should go to the limit and stop, operate it in both directions to check the limits. If it only operates in one direction your circuit board may have stuck relay contacts. Remove the covers and check both, replace if relay if contacts are burnt. Install and run without the chain on to make sure limit switch contacts are working properly then install the chain and recheck limit switch settings.