Pump control panel (electrical diagram attached). Could someone tell which ones of 1 2 3 4 5 6 are hots and which one are neutral?
They're all "hot". You're dealing with switches, so there's no "neutral".  You have an ungrounded (hot) conductor leading to the switch, and an ungrounded (hot) conductor coming back from the switch.

The switches are simply a way to open the circuit, so it doesn't usually matter which way they're installed.  When the switch is open, the circuit is open. When the switch is closed, the circuit is closed. 

The grounded (neutral) doesn't come in until after the load.