you either have a PIN that way have pumps On and save solenoid
or you don t have a PIN,then select Pumps OFF.
you could say it's only a backup to have them off,OK i agree but why should you select Gens online during pushback and cause troubles if you are looking for backup??
IT really doesn't make any sense to select Gens online while on pushback.
to save time (and solenoid) : Hydraulics Normal.PIN IN
start pushback,start engine 2.wait till end of pushback and then start engine 1. doesn't take long time. (for elec 2 you can select it OFF)